/
meshtools.py
1767 lines (1601 loc) · 81.5 KB
/
meshtools.py
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# ***************************************************************************
# * *
# * Copyright (c) 2016 - Bernd Hahnebach <bernd@bimstatik.org> *
# * *
# * This program is free software; you can redistribute it and/or modify *
# * it under the terms of the GNU Lesser General Public License (LGPL) *
# * as published by the Free Software Foundation; either version 2 of *
# * the License, or (at your option) any later version. *
# * for detail see the LICENCE text file. *
# * *
# * This program is distributed in the hope that it will be useful, *
# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
# * GNU Library General Public License for more details. *
# * *
# * You should have received a copy of the GNU Library General Public *
# * License along with this program; if not, write to the Free Software *
# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
# * USA *
# * *
# ***************************************************************************
__title__ = "Tools for the work with FEM meshes"
__author__ = "Bernd Hahnebach"
__url__ = "http://www.freecadweb.org"
## \addtogroup FEM
# @{
import FreeCAD
def get_femnodes_by_femobj_with_references(femmesh, femobj):
node_set = []
if femmesh.GroupCount:
node_set = get_femmesh_groupdata_sets_by_name(femmesh, femobj, 'Node')
# print('node_set_group: ', node_set)
if node_set:
print(" nodes where retrieved from existent FEM mesh group data")
if not node_set:
print(" nodes will be retrieved by searching the appropriate nodes in the FEM mesh")
node_set = get_femnodes_by_references(femmesh, femobj['Object'].References)
# print('node_set_nogroup: ', node_set)
return node_set
def get_femelements_by_references(femmesh, femelement_table, references, femnodes_ele_table=None):
'''get the femelements for a list of references
'''
references_femelements = []
for ref in references:
ref_femnodes = get_femnodes_by_refshape(femmesh, ref) # femnodes for the current ref
if femnodes_ele_table:
# blind fast binary search, works for volumes only
references_femelements += get_femelements_by_femnodes_bin(femelement_table, femnodes_ele_table, ref_femnodes) # femelements for all references
else:
# standard search
references_femelements += get_femelements_by_femnodes_std(femelement_table, ref_femnodes) # femelements for all references
return references_femelements
def get_femnodes_by_references(femmesh, references):
'''get the femnodes for a list of references
'''
references_femnodes = []
for ref in references:
references_femnodes += get_femnodes_by_refshape(femmesh, ref)
# return references_femnodes # keeps duplicate nodes, keeps node order
# if nodes are used for nodesets, duplicates should be removed
return list(set(references_femnodes)) # removes duplicate nodes, sorts node order
def get_femnodes_by_refshape(femmesh, ref):
nodes = []
for refelement in ref[1]:
r = get_element(ref[0], refelement) # the method getElement(element) does not return Solid elements
print(' ReferenceShape ... Type: ' + r.ShapeType + ', Object name: ' + ref[0].Name + ', Object label: ' + ref[0].Label + ', Element name: ' + refelement)
if r.ShapeType == 'Vertex':
nodes += femmesh.getNodesByVertex(r)
elif r.ShapeType == 'Edge':
nodes += femmesh.getNodesByEdge(r)
elif r.ShapeType == 'Face':
nodes += femmesh.getNodesByFace(r)
elif r.ShapeType == 'Solid':
nodes += femmesh.getNodesBySolid(r)
else:
print(' No Vertice, Edge, Face or Solid as reference shapes!')
return nodes
def get_femelement_table(femmesh):
""" get_femelement_table(femmesh): { elementid : [ nodeid, nodeid, ... , nodeid ] }"""
femelement_table = {}
if is_solid_femmesh(femmesh):
for i in femmesh.Volumes:
femelement_table[i] = femmesh.getElementNodes(i)
elif is_face_femmesh(femmesh):
for i in femmesh.Faces:
femelement_table[i] = femmesh.getElementNodes(i)
elif is_edge_femmesh(femmesh):
for i in femmesh.Edges:
femelement_table[i] = femmesh.getElementNodes(i)
else:
FreeCAD.Console.PrintError('Neither solid nor face nor edge femmesh!\n')
return femelement_table
def get_femelement_volumes_table(femmesh):
""" get_femelement_volumes_table(femmesh): { elementid : [ nodeid, nodeid, ... , nodeid ] }"""
table = {}
for i in femmesh.Volumes:
table[i] = femmesh.getElementNodes(i)
return table
def get_femelement_faces_table(femmesh, faces_only=None):
""" get_femelement_faces_table(femmesh): { elementid : [ nodeid, nodeid, ... , nodeid ] }"""
table = {}
if not faces_only:
faces_only = femmesh.FacesOnly
for i in faces_only:
table[i] = femmesh.getElementNodes(i)
return table
def get_femelement_edges_table(femmesh, edges_only=None):
""" get_femelement_edges_table(femmesh): { elementid : [ nodeid, nodeid, ... , nodeid ] }"""
table = {}
if not edges_only:
edges_only = femmesh.EdgesOnly
for i in edges_only:
table[i] = femmesh.getElementNodes(i)
return table
def get_femnodes_ele_table(femnodes_mesh, femelement_table):
'''the femnodes_ele_table contains for each node its membership in elements
{nodeID : [[eleID, NodePosition], [], ...], nodeID : [[], [], ...], ...}
stored informatation are:
element number, the number of nodes per element, the position of the node in the element.
The position of the node in the element is coded as a set bit at that position in a bit array (integer)
Fixme: the number of nodes per element should be replaced by the type of the element
but I did not know, how to get this from the mesh.
Since the femelement_table contains either volume or face or edgemesh the femnodes_ele_table only
has either volume or face or edge elements, see get_femelement_table()
'''
femnodes_ele_table = {} # node_dict in ulrichs class
for n in femnodes_mesh: # initialize it with sorted node keys and empty lists
femnodes_ele_table[n] = []
for ele in femelement_table:
ele_list = femelement_table[ele]
# print(ele_list)
pos = int(1)
for ele_node in ele_list:
femnodes_ele_table[ele_node].append([ele, pos])
pos = pos << 1
print('len femnodes_ele_table: ' + str(len(femnodes_ele_table)))
# print('femnodes_ele_table: ', femnodes_ele_table)
return femnodes_ele_table
def get_copy_of_empty_femelement_table(femelement_table):
'''{eleID : 0, eleID : 0, ...}
'''
empty_femelement_table = {}
for ele in femelement_table: # initialize it with sorted element keys and empty int
empty_femelement_table[ele] = 0
return empty_femelement_table.copy()
def get_bit_pattern_dict(femelement_table, femnodes_ele_table, node_set):
'''Now we are looking for nodes inside of the Faces = filling the bit_pattern_dict
{eleID : [lenEleNodes, binary_position]}
see forum post for a very good explanation of what's really happening
http://forum.freecadweb.org/viewtopic.php?f=18&p=141133&sid=013c93f496a63872951d2ce521702ffa#p141108
The bit_pattern_dict holds later an integer (bit array) for each element, which gives us
the information we are searching for:
Is this element part of the node list (searching for elements) or has this element a face we are searching for?
The number in the ele_dict is organized as a bit array.
The corresponding bit is set, if the node of the node_set is contained in the element.
'''
print('len femnodes_ele_table: ' + str(len(femnodes_ele_table)))
print('len node_set: ' + str(len(node_set)))
# print('node_set: ', node_set)
bit_pattern_dict = get_copy_of_empty_femelement_table(femelement_table)
# # initializing the bit_pattern_dict
for ele in femelement_table:
len_ele = len(femelement_table[ele])
bit_pattern_dict[ele] = [len_ele, 0]
for node in node_set:
for nList in femnodes_ele_table[node]:
bit_pattern_dict[nList[0]][1] += nList[1]
print('len bit_pattern_dict: ' + str(len(bit_pattern_dict)))
# print('bit_pattern_dict: ', bit_pattern_dict)
return bit_pattern_dict
def get_ccxelement_faces_from_binary_search(bit_pattern_dict):
'''get the CalculiX element face numbers
'''
tet10_mask = {
119: 1,
411: 2,
717: 3,
814: 4}
tet4_mask = {
7: 1,
11: 2,
13: 3,
14: 4}
hex8_mask = {
240: 1,
15: 2,
102: 3,
204: 4,
153: 5,
51: 6}
hex20_mask = {
61680: 1,
3855: 2,
402022: 3,
804044: 4,
624793: 5,
201011: 6}
pent6_mask = {
56: 1,
7: 2,
54: 3,
45: 4,
27: 5}
pent15_mask = {
3640: 1,
455: 2,
25782: 3,
22829: 4,
12891: 5}
vol_dict = {
4: tet4_mask,
6: pent6_mask,
8: hex8_mask,
10: tet10_mask,
15: pent15_mask,
20: hex20_mask}
faces = []
for ele in bit_pattern_dict:
mask_dict = vol_dict[bit_pattern_dict[ele][0]]
for key in mask_dict:
if (key & bit_pattern_dict[ele][1]) == key:
faces.append([ele, mask_dict[key]])
print('found Faces: ', len(faces))
print('faces: ', faces)
return faces
def get_femelements_by_femnodes_bin(femelement_table, femnodes_ele_table, node_list):
'''for every femelement of femelement_table
if all nodes of the femelement are in node_list,
the femelement is added to the list which is returned
blind fast binary search, but works for volumes only
'''
print('binary search: get_femelements_by_femnodes_bin')
vol_masks = {
4: 15,
6: 63,
8: 255,
10: 1023,
15: 32767,
20: 1048575}
# Now we are looking for nodes inside of the Volumes = filling the bit_pattern_dict
print('len femnodes_ele_table: ' + str(len(femnodes_ele_table)))
bit_pattern_dict = get_bit_pattern_dict(femelement_table, femnodes_ele_table, node_list)
# search
ele_list = [] # The ele_list contains the result of the search.
for ele in bit_pattern_dict:
# print('bit_pattern_dict[ele][0]: ', bit_pattern_dict[ele][0])
if bit_pattern_dict[ele][1] == vol_masks[bit_pattern_dict[ele][0]]:
ele_list.append(ele)
print('found Volumes: ', len(ele_list))
print(' volumes: ', len(ele_list))
return ele_list
def get_femelements_by_femnodes_std(femelement_table, node_list):
'''for every femelement of femelement_table
if all nodes of the femelement are in node_list,
the femelement is added to the list which is returned
e: elementlist
nodes: nodelist '''
print('std search: get_femelements_by_femnodes_std')
e = [] # elementlist
for elementID in sorted(femelement_table):
nodecount = 0
for nodeID in femelement_table[elementID]:
if nodeID in node_list:
nodecount = nodecount + 1
if nodecount == len(femelement_table[elementID]): # all nodes of the element are in the node_list!
e.append(elementID)
return e
def get_femvolumeelements_by_femfacenodes(femelement_table, node_list):
'''assume femelement_table only has volume elements
for every femvolumeelement of femelement_table
for tetra4 and tetra10 the C++ methods could be used --> test again to be sure
if hexa8 volume element --> if exact 4 element nodes are in node_list --> add femelement
if hexa20 volume element --> if exact 8 element nodes are in node_list --> add femelement
if penta6 volume element --> if exact 3 or 6 element nodes are in node_list --> add femelement
if penta15 volume element --> if exact 6 or 8 element nodes are in node_list --> add femelement
e: elementlist
nodes: nodelist '''
e = [] # elementlist
for elementID in sorted(femelement_table):
nodecount = 0
el_nd_ct = len(femelement_table[elementID])
if el_nd_ct == 4: # tetra4
for nodeID in femelement_table[elementID]:
if nodeID in node_list:
nodecount = nodecount + 1
if nodecount == 3:
e.append(elementID)
elif el_nd_ct == 10: # tetra10
for nodeID in femelement_table[elementID]:
if nodeID in node_list:
nodecount = nodecount + 1
if nodecount == 4:
e.append(elementID)
elif el_nd_ct == 8: # hexa8
for nodeID in femelement_table[elementID]:
if nodeID in node_list:
nodecount = nodecount + 1
if nodecount == 4:
e.append(elementID)
elif el_nd_ct == 20: # hexa20
for nodeID in femelement_table[elementID]:
if nodeID in node_list:
nodecount = nodecount + 1
if nodecount == 8:
e.append(elementID)
elif el_nd_ct == 6: # penta6
for nodeID in femelement_table[elementID]:
if nodeID in node_list:
nodecount = nodecount + 1
if nodecount == 3 or nodecount == 4:
e.append(elementID)
elif el_nd_ct == 15: # penta15
for nodeID in femelement_table[elementID]:
if nodeID in node_list:
nodecount = nodecount + 1
if nodecount == 6 or nodecount == 8:
e.append(elementID)
else:
FreeCAD.Console.PrintError('Error in get_femvolumeelements_by_femfacenodes(): unknown volume element: ' + el_nd_ct + '\n')
# print(sorted(e))
return e
def get_femelement_sets(femmesh, femelement_table, fem_objects, femnodes_ele_table=None): # fem_objects = FreeCAD FEM document objects
# get femelements for reference shapes of each obj.References
count_femelements = 0
referenced_femelements = []
has_remaining_femelements = None
for fem_object_i, fem_object in enumerate(fem_objects):
obj = fem_object['Object']
print("Constraint: " + obj.Name + " --> " + "We're going to search in the mesh for the element ID's.")
fem_object['ShortName'] = get_elset_short_name(obj, fem_object_i) # unique short identifier
if obj.References:
ref_shape_femelements = []
ref_shape_femelements = get_femelements_by_references(femmesh, femelement_table, obj.References, femnodes_ele_table)
referenced_femelements += ref_shape_femelements
count_femelements += len(ref_shape_femelements)
fem_object['FEMElements'] = ref_shape_femelements
else:
has_remaining_femelements = obj.Name
# get remaining femelements for the fem_objects
if has_remaining_femelements:
remaining_femelements = []
for elemid in femelement_table:
if elemid not in referenced_femelements:
remaining_femelements.append(elemid)
count_femelements += len(remaining_femelements)
for fem_object in fem_objects:
obj = fem_object['Object']
if obj.Name == has_remaining_femelements:
fem_object['FEMElements'] = sorted(remaining_femelements)
# check if all worked out well
if femelements_count_ok(len(femelement_table), count_femelements):
return True
else:
FreeCAD.Console.PrintError('Error in get_femelement_sets -- > femelements_count_ok() failed!\n')
return False
def get_femelement_direction1D_set(femmesh, femelement_table, beamrotation_objects, theshape=None):
'''
get for each geometry edge direction, the normal and the element ids and write all into the beamrotation_objects
means no return value, we're going to write into the beamrotation_objects dictionary
FEMRotations1D is a list of dictionaries for every beamdirection of all edges
beamrot_obj['FEMRotations1D'] = [ {'ids' : [theids],
'direction' : direction,
'normal' : normal},
...
]
'''
if len(beamrotation_objects) == 0:
# no beamrotation document object, all beams use standard rotation of 0 degree (angle), we need theshape (the shape which was meshed)
# since ccx needs to split them in sets anyway we need to take care of this too
rotations_ids = get_femelement_directions_theshape(femmesh, femelement_table, theshape)
# add normals for each direction
rotation_angle = 0
for rot in rotations_ids:
rot['normal'] = get_beam_normal(rot['direction'], rotation_angle)
beamrotation_objects.append({'FEMRotations1D': rotations_ids, 'ShortName': 'Rstd'}) # key 'Object' will be empty
elif len(beamrotation_objects) == 1:
# one beamrotation document object with no references, all beams use rotation from this object, we need theshape (the shape which was meshed)
# since ccx needs to split them in sets anyway we need to take care of this too
rotations_ids = get_femelement_directions_theshape(femmesh, femelement_table, theshape)
# add normals for each direction
rotation_angle = beamrotation_objects[0]['Object'].Rotation
for rot in rotations_ids:
rot['normal'] = get_beam_normal(rot['direction'], rotation_angle)
beamrotation_objects[0]['FEMRotations1D'] = rotations_ids
beamrotation_objects[0]['ShortName'] = 'R0'
elif len(beamrotation_objects) > 1:
# multiple beam rotation document objects, rotations defined by reference shapes, TODO implement this
# do not forget all the corner cases:
# one beam rotation object, but not all edges are ref shapes
# more than one beam rotation object, but not all edges are in the ref shapes
# for the both cases above, all other edges get standard rotation.
# more than one beam rotation objects and on has no ref shapes, all edges no in an rotation object use this rotation
# one edge is in more than one beam rotation object, error
# pre check, only one beam rotation with empty ref shapes is allowed
# we need theshape for multiple rotations too, because of the corner cases mentioned above
FreeCAD.Console.PrintError('Multiple Rotations not yet supported!\n')
for rot_object in beamrotation_objects: # debug print
print(rot_object['FEMRotations1D'])
def get_femelement_directions_theshape(femmesh, femelement_table, theshape):
# see get_femelement_direction1D_set
rotations_ids = []
# add directions and all ids for each direction
for e in theshape.Shape.Edges:
the_edge = {}
the_edge['direction'] = e.Vertexes[1].Point - e.Vertexes[0].Point
edge_femnodes = femmesh.getNodesByEdge(e) # femnodes for the current edge
the_edge['ids'] = get_femelements_by_femnodes_std(femelement_table, edge_femnodes) # femelements for this edge
for rot in rotations_ids:
if rot['direction'] == the_edge['direction']: # tolerance will be managed by FreeCAD see https://forum.freecadweb.org/viewtopic.php?f=22&t=14179
rot['ids'] += the_edge['ids']
break
else:
rotations_ids.append(the_edge)
return rotations_ids
def get_beam_normal(beam_direction, defined_angle):
import math
vector_a = beam_direction
angle_rad = (math.pi / 180) * defined_angle
nx = abs(math.cos(angle_rad))
ny = abs(math.sin(angle_rad))
if nx < 0.0000001:
nx = 0
if ny < 0.0000001:
ny = 0
# vector_n = [nx, ny] # not used ATM
if vector_a[0] != 0:
temp_valx = -(vector_a[1] + vector_a[2]) / vector_a[0]
else:
temp_valx = 0
if vector_a[1] != 0:
temp_valy = -(vector_a[0] + vector_a[2]) / vector_a[1]
else:
temp_valy = 0
if vector_a[2] != 0:
temp_valz = -(vector_a[0] + vector_a[1]) / vector_a[2]
else:
temp_valz = 0
Dot_product_check_x = None
Dot_product_check_y = None
Dot_product_check_z = None
Dot_product_check_nt = None
if vector_a[0] != 0 and vector_a[1] == 0 and vector_a[2] == 0:
normal_n = [temp_valx, nx, ny]
Dot_product_check_x = vector_a[0] * normal_n[0] + vector_a[1] * normal_n[1] + vector_a[2] * normal_n[2]
elif vector_a[0] == 0 and vector_a[1] != 0 and vector_a[2] == 0:
normal_n = [nx, temp_valy, ny]
Dot_product_check_y = vector_a[0] * normal_n[0] + vector_a[1] * normal_n[1] + vector_a[2] * normal_n[2]
elif vector_a[0] == 0 and vector_a[1] == 0 and vector_a[2] != 0:
normal_n = [nx, ny, temp_valz]
Dot_product_check_z = vector_a[0] * normal_n[0] + vector_a[1] * normal_n[1] + vector_a[2] * normal_n[2]
elif vector_a[0] == 0 and vector_a[1] != 0 and vector_a[2] != 0:
normal_n = [nx, temp_valy, ny]
Dot_product_check_y = vector_a[0] * normal_n[0] + vector_a[1] * normal_n[1] + vector_a[2] * normal_n[2]
elif vector_a[0] != 0 and vector_a[1] == 0 and vector_a[2] != 0:
normal_n = [nx, ny, temp_valz]
Dot_product_check_z = vector_a[0] * normal_n[0] + vector_a[1] * normal_n[1] + vector_a[2] * normal_n[2]
else:
normal_n = [temp_valx, nx, ny]
Dot_product_check_nt = vector_a[0] * normal_n[0] + vector_a[1] * normal_n[1] + vector_a[2] * normal_n[2]
Dot_product_check = vector_a[0] * normal_n[0] + vector_a[1] * normal_n[1] + vector_a[2] * normal_n[2]
# print(Dot_product_check)
# print(normal_n)
# dummy usage of the axis Dot_product_check to get flake8 quiet
del Dot_product_check_x, Dot_product_check_y, Dot_product_check_z, Dot_product_check, Dot_product_check_nt
return normal_n
def get_femmesh_groupdata_sets_by_name(femmesh, fem_object, group_data_type):
# get ids from femmesh groupdata for reference shapes of each obj.References
# we assume the mesh group data fits with the reference shapes, no check is done in this regard !!!
# we just check for the group name and the group data type
# what happens if a reference shape was changed, but the mesh and the mesh groups were not created new !?!
obj = fem_object['Object']
if femmesh.GroupCount:
for g in femmesh.Groups:
grp_name = femmesh.getGroupName(g)
if grp_name.startswith(obj.Name + "_"):
if femmesh.getGroupElementType(g) == group_data_type:
print(" found mesh group for the IDs: " + grp_name + ', Type: ' + group_data_type)
return femmesh.getGroupElements(g) # == ref_shape_femelements
return () # an empty tuple is returned if no group data IDs where found
def get_femelement_sets_from_group_data(femmesh, fem_objects):
# get femelements from femmesh groupdata for reference shapes of each obj.References
count_femelements = 0
sum_group_elements = []
for fem_object_i, fem_object in enumerate(fem_objects):
obj = fem_object['Object']
print("Constraint: " + obj.Name + " --> " + "We have mesh groups. We will search for appropriate group data.")
fem_object['ShortName'] = get_elset_short_name(obj, fem_object_i) # unique short identifier
group_elements = get_femmesh_groupdata_sets_by_name(femmesh, fem_object, 'Volume') # see comments over there !
sum_group_elements += group_elements
count_femelements += len(group_elements)
fem_object['FEMElements'] = group_elements
# check if all worked out well
if not femelements_count_ok(femmesh.VolumeCount, count_femelements):
FreeCAD.Console.PrintError('Error in get_femelement_sets_from_group_data -- > femelements_count_ok() failed!\n')
return False
else:
return True
# print("")
def get_elset_short_name(obj, i):
if hasattr(obj, "Proxy") and obj.Proxy.Type == 'Fem::Material':
return 'M' + str(i)
elif hasattr(obj, "Proxy") and obj.Proxy.Type == 'Fem::FemElementGeometry1D':
return 'B' + str(i)
elif hasattr(obj, "Proxy") and obj.Proxy.Type == 'Fem::FemElementRotation1D':
return 'R' + str(i)
elif hasattr(obj, "Proxy") and obj.Proxy.Type == 'Fem::FemElementFluid1D':
return 'F' + str(i)
elif hasattr(obj, "Proxy") and obj.Proxy.Type == 'Fem::FemElementGeometry2D':
return 'S' + str(i)
else:
FreeCAD.Console.PrintError('Error in creating short elset name for obj: ' + obj.Name + ' --> Proxy.Type: ' + str(obj.Proxy.Type) + '\n')
def get_force_obj_vertex_nodeload_table(femmesh, frc_obj):
# force_obj_node_load_table = [('refshape_name.elemname',node_load_table), ..., ('refshape_name.elemname',node_load_table)]
force_obj_node_load_table = []
node_load = frc_obj.Force / len(frc_obj.References)
for o, elem_tup in frc_obj.References:
node_count = len(elem_tup)
for elem in elem_tup:
ref_node = o.Shape.getElement(elem)
node = femmesh.getNodesByVertex(ref_node)
elem_info_string = 'node load on shape: ' + o.Name + ':' + elem
force_obj_node_load_table.append((elem_info_string, {node[0]: node_load / node_count}))
return force_obj_node_load_table
def get_force_obj_edge_nodeload_table(femmesh, femelement_table, femnodes_mesh, frc_obj):
# force_obj_node_load_table = [('refshape_name.elemname',node_load_table), ..., ('refshape_name.elemname',node_load_table)]
force_obj_node_load_table = []
sum_ref_edge_length = 0
sum_ref_edge_node_length = 0 # for debugging
sum_node_load = 0 # for debugging
for o, elem_tup in frc_obj.References:
for elem in elem_tup:
sum_ref_edge_length += o.Shape.getElement(elem).Length
if sum_ref_edge_length != 0:
force_per_sum_ref_edge_length = frc_obj.Force / sum_ref_edge_length
for o, elem_tup in frc_obj.References:
for elem in elem_tup:
ref_edge = o.Shape.getElement(elem)
# edge_table = { meshedgeID : ( nodeID, ... , nodeID ) }
edge_table = get_ref_edgenodes_table(femmesh, femelement_table, ref_edge)
# node_length_table = [ (nodeID, length), ... , (nodeID, length) ] some nodes will have more than one entry
node_length_table = get_ref_edgenodes_lengths(femnodes_mesh, edge_table)
# node_sum_length_table = { nodeID : Length, ... , nodeID : Length } LengthSum for each node, one entry for each node
node_sum_length_table = get_ref_shape_node_sum_geom_table(node_length_table)
# node_load_table = { nodeID : NodeLoad, ... , nodeID : NodeLoad } NodeLoad for each node, one entry for each node
node_load_table = {}
sum_node_lengths = 0 # for debugging
for node in node_sum_length_table:
sum_node_lengths += node_sum_length_table[node] # for debugging
node_load_table[node] = node_sum_length_table[node] * force_per_sum_ref_edge_length
ratio_refedge_lengths = sum_node_lengths / ref_edge.Length
if ratio_refedge_lengths < 0.99 or ratio_refedge_lengths > 1.01:
FreeCAD.Console.PrintError('Error on: ' + frc_obj.Name + ' --> ' + o.Name + '.' + elem + '\n')
print(' sum_node_lengths: ', sum_node_lengths)
print(' refedge_length: ', ref_edge.Length)
bad_refedge = ref_edge
sum_ref_edge_node_length += sum_node_lengths
elem_info_string = 'node loads on shape: ' + o.Name + ':' + elem
force_obj_node_load_table.append((elem_info_string, node_load_table))
for ref_shape in force_obj_node_load_table:
for node in ref_shape[1]:
sum_node_load += ref_shape[1][node] # for debugging
ratio = sum_node_load / frc_obj.Force
if ratio < 0.99 or ratio > 1.01:
print('Deviation sum_node_load to frc_obj.Force is more than 1% : ', ratio)
print(' sum_ref_edge_node_length: ', sum_ref_edge_node_length)
print(' sum_ref_edge_length: ', sum_ref_edge_length)
print(' sum_node_load: ', sum_node_load)
print(' frc_obj.Force: ', frc_obj.Force)
print(' the reason could be simply a circle length --> see method get_ref_edge_node_lengths')
print(' the reason could also be a problem in retrieving the ref_edge_node_length')
# try debugging of the last bad refedge
print('DEBUGGING')
print(bad_refedge)
print('bad_refedge_nodes')
bad_refedge_nodes = femmesh.getNodesByEdge(bad_refedge)
print(len(bad_refedge_nodes))
print(bad_refedge_nodes)
# import FreeCADGui
# FreeCADGui.ActiveDocument.Compound_Mesh.HighlightedNodes = bad_refedge_nodes
print('bad_edge_table')
# bad_edge_table = { meshedgeID : ( nodeID, ... , nodeID ) }
bad_edge_table = get_ref_edgenodes_table(femmesh, femelement_table, bad_refedge)
print(len(bad_edge_table))
bad_edge_table_nodes = []
for elem in bad_edge_table:
print(elem, ' --> ', bad_edge_table[elem])
for node in bad_edge_table[elem]:
if node not in bad_edge_table_nodes:
bad_edge_table_nodes.append(node)
print('sorted(bad_edge_table_nodes)')
print(sorted(bad_edge_table_nodes)) # should be == bad_refedge_nodes
# import FreeCADGui
# FreeCADGui.ActiveDocument.Compound_Mesh.HighlightedNodes = bad_edge_table_nodes
# bad_node_length_table = [ (nodeID, length), ... , (nodeID, length) ] some nodes will have more than one entry
print('good_edge_table')
good_edge_table = delete_duplicate_mesh_elements(bad_edge_table)
for elem in good_edge_table:
print(elem, ' --> ', bad_edge_table[elem])
print('bad_node_length_table')
bad_node_length_table = get_ref_edgenodes_lengths(femnodes_mesh, bad_edge_table)
for n, l in bad_node_length_table:
print(n, ' --> ', l)
return force_obj_node_load_table
def get_pressure_obj_faces_depreciated(femmesh, femobj):
pressure_faces = []
for o, elem_tup in femobj['Object'].References:
for elem in elem_tup:
ref_shape = o.Shape.getElement(elem)
elem_info_string = 'face load on shape: ' + o.Name + ':' + elem
print(elem_info_string)
if ref_shape.ShapeType == 'Face':
pressure_faces.append((elem_info_string, femmesh.getccxVolumesByFace(ref_shape)))
return pressure_faces
def get_pressure_obj_faces(femmesh, femelement_table, femnodes_ele_table, femobj):
if is_solid_femmesh(femmesh):
# get the nodes
prs_face_node_set = get_femnodes_by_femobj_with_references(femmesh, femobj) # sorted and duplicates removed
# print('prs_face_node_set: ', prs_face_node_set)
# fill the bit_pattern_dict and search for the faces
bit_pattern_dict = get_bit_pattern_dict(femelement_table, femnodes_ele_table, prs_face_node_set)
pressure_faces = get_ccxelement_faces_from_binary_search(bit_pattern_dict)
elif is_face_femmesh(femmesh):
pressure_faces = []
# normally we should call get_femelements_by_references and the group check should be integrated there
if femmesh.GroupCount:
meshfaces = get_femmesh_groupdata_sets_by_name(femmesh, femobj, 'Face')
# print(meshfaces)
if not meshfaces:
FreeCAD.Console.PrintError("Error: Something went wrong in getting the group element faces.\n")
else:
for mf in meshfaces:
# pressure_faces.append([mf, 0])
pressure_faces.append([mf, -1])
# 0 if femmeshface normal == reference face normal direction
# -1 if femmeshface normal opposite reference face normal direction
# easy on plane faces, but on a half sphere ... ?!?
else:
FreeCAD.Console.PrintError("Pressure on shell mesh at the moment only supported for meshes with appropriate group data.\n")
return pressure_faces
def get_force_obj_face_nodeload_table(femmesh, femelement_table, femnodes_mesh, frc_obj):
# force_obj_node_load_table = [('refshape_name.elemname',node_load_table), ..., ('refshape_name.elemname',node_load_table)]
force_obj_node_load_table = []
sum_ref_face_area = 0
sum_ref_face_node_area = 0 # for debugging
sum_node_load = 0 # for debugging
for o, elem_tup in frc_obj.References:
for elem in elem_tup:
sum_ref_face_area += o.Shape.getElement(elem).Area
if sum_ref_face_area != 0:
force_per_sum_ref_face_area = frc_obj.Force / sum_ref_face_area
for o, elem_tup in frc_obj.References:
for elem in elem_tup:
ref_face = o.Shape.getElement(elem)
# face_table = { meshfaceID : ( nodeID, ... , nodeID ) }
face_table = get_ref_facenodes_table(femmesh, femelement_table, ref_face)
# node_area_table = [ (nodeID, Area), ... , (nodeID, Area) ] some nodes will have more than one entry
node_area_table = get_ref_facenodes_areas(femnodes_mesh, face_table)
# node_sum_area_table = { nodeID : Area, ... , nodeID : Area } AreaSum for each node, one entry for each node
node_sum_area_table = get_ref_shape_node_sum_geom_table(node_area_table)
# node_load_table = { nodeID : NodeLoad, ... , nodeID : NodeLoad } NodeLoad for each node, one entry for each node
node_load_table = {}
sum_node_areas = 0 # for debugging
for node in node_sum_area_table:
sum_node_areas += node_sum_area_table[node] # for debugging
node_load_table[node] = node_sum_area_table[node] * force_per_sum_ref_face_area
ratio_refface_areas = sum_node_areas / ref_face.Area
if ratio_refface_areas < 0.99 or ratio_refface_areas > 1.01:
FreeCAD.Console.PrintError('Error on: ' + frc_obj.Name + ' --> ' + o.Name + '.' + elem + '\n')
print(' sum_node_areas: ', sum_node_areas)
print(' ref_face_area: ', ref_face.Area)
sum_ref_face_node_area += sum_node_areas
elem_info_string = 'node loads on shape: ' + o.Name + ':' + elem
force_obj_node_load_table.append((elem_info_string, node_load_table))
for ref_shape in force_obj_node_load_table:
for node in ref_shape[1]:
sum_node_load += ref_shape[1][node] # for debugging
ratio = sum_node_load / frc_obj.Force
if ratio < 0.99 or ratio > 1.01:
print('Deviation sum_node_load to frc_obj.Force is more than 1% : ', ratio)
print(' sum_ref_face_node_area: ', sum_ref_face_node_area)
print(' sum_ref_face_area: ', sum_ref_face_area)
print(' sum_node_load: ', sum_node_load)
print(' frc_obj.Force: ', frc_obj.Force)
print(' the reason could be simply a circle area --> see method get_ref_face_node_areas')
print(' the reason could also be a problem in retrieving the ref_face_node_area')
return force_obj_node_load_table
def get_ref_edgenodes_table(femmesh, femelement_table, refedge):
edge_table = {} # { meshedgeID : ( nodeID, ... , nodeID ) }
refedge_nodes = femmesh.getNodesByEdge(refedge)
if is_solid_femmesh(femmesh):
refedge_fem_volumeelements = []
# if at least two nodes of a femvolumeelement are in refedge_nodes the volume is added to refedge_fem_volumeelements
for elem in femelement_table:
nodecount = 0
for node in femelement_table[elem]:
if node in refedge_nodes:
nodecount += 1
if nodecount > 1:
refedge_fem_volumeelements.append(elem)
# for every refedge_fem_volumeelement look which of its nodes is in refedge_nodes --> add all these nodes to edge_table
for elem in refedge_fem_volumeelements:
fe_refedge_nodes = []
for node in femelement_table[elem]:
if node in refedge_nodes:
fe_refedge_nodes.append(node)
edge_table[elem] = fe_refedge_nodes # { volumeID : ( edgenodeID, ... , edgenodeID )} # only the refedge nodes
# FIXME: duplicate_mesh_elements: as soon as contact and springs are supported the user should decide on which edge the load is applied
edge_table = delete_duplicate_mesh_elements(edge_table)
elif is_face_femmesh(femmesh):
refedge_fem_faceelements = []
# if at least two nodes of a femfaceelement are in refedge_nodes the volume is added to refedge_fem_volumeelements
for elem in femelement_table:
nodecount = 0
for node in femelement_table[elem]:
if node in refedge_nodes:
nodecount += 1
if nodecount > 1:
refedge_fem_faceelements.append(elem)
# for every refedge_fem_faceelement look which of his nodes is in refedge_nodes --> add all these nodes to edge_table
for elem in refedge_fem_faceelements:
fe_refedge_nodes = []
for node in femelement_table[elem]:
if node in refedge_nodes:
fe_refedge_nodes.append(node)
edge_table[elem] = fe_refedge_nodes # { faceID : ( edgenodeID, ... , edgenodeID )} # only the refedge nodes
# FIXME: duplicate_mesh_elements: as soon as contact and springs are supported the user should decide on which edge the load is applied
edge_table = delete_duplicate_mesh_elements(edge_table)
elif is_edge_femmesh(femmesh):
refedge_fem_edgeelements = get_femelements_by_femnodes_std(femelement_table, refedge_nodes)
for elem in refedge_fem_edgeelements:
edge_table[elem] = femelement_table[elem] # { edgeID : ( nodeID, ... , nodeID )} # all nodes off this femedgeelement
return edge_table
def get_ref_edgenodes_lengths(femnodes_mesh, edge_table):
# calculate the appropriate node_length for every node of every mesh edge (me)
# G. Lakshmi Narasaiah, Finite Element Analysis, p206ff
# [ (nodeID, length), ... , (nodeID, length) ] some nodes will have more than one entry
if (not femnodes_mesh) or (not edge_table):
FreeCAD.Console.PrintError("Error in get_ref_edgenodes_lengths(): Empty femnodes_mesh or edge_table!\n")
return []
node_length_table = []
mesh_edge_length = 0
# print(len(edge_table))
for me in edge_table:
femmesh_edgetype = len(edge_table[me])
if femmesh_edgetype == 2: # 2 node femmesh edge
# end_node_length = mesh_edge_length / 2
# ______
# P1 P2
P1 = femnodes_mesh[edge_table[me][0]]
P2 = femnodes_mesh[edge_table[me][1]]
edge_vec = P2 - P1
mesh_edge_length = edge_vec.Length
# print(mesh_edge_length)
end_node_length = mesh_edge_length / 2.0
node_length_table.append((edge_table[me][0], end_node_length))
node_length_table.append((edge_table[me][1], end_node_length))
elif femmesh_edgetype == 3: # 3 node femmesh edge
# end_node_length = mesh_edge_length / 6
# middle_node_length = mesh_edge_length * 2 / 3
# _______ _______
# P1 P3 P2
P1 = femnodes_mesh[edge_table[me][0]]
P2 = femnodes_mesh[edge_table[me][1]]
P3 = femnodes_mesh[edge_table[me][2]]
edge_vec1 = P3 - P1
edge_vec2 = P2 - P3
mesh_edge_length = edge_vec1.Length + edge_vec2.Length
# print(me, ' --> ', mesh_edge_length)
end_node_length = mesh_edge_length / 6.0
middle_node_length = mesh_edge_length * 2.0 / 3.0
node_length_table.append((edge_table[me][0], end_node_length))
node_length_table.append((edge_table[me][1], end_node_length))
node_length_table.append((edge_table[me][2], middle_node_length))
return node_length_table
def get_ref_facenodes_table(femmesh, femelement_table, ref_face):
face_table = {} # { meshfaceID : ( nodeID, ... , nodeID ) }
if is_solid_femmesh(femmesh):
if has_no_face_data(femmesh):
print('No face date in volume mesh. We try to use getccxVolumesByFace() to retrieve the volume elements of the ref_face!')
# there is no face data
# the problem if we retrieve the nodes ourself is they are not sorted we just have the nodes.
# We need to sort them according the shell mesh notation of tria3, tria6, quad4, quad8
ref_face_nodes = femmesh.getNodesByFace(ref_face)
# try to use getccxVolumesByFace() to get the volume ids of element with elementfaces on the ref_face --> should work for tetra4 and tetra10
ref_face_volume_elements = femmesh.getccxVolumesByFace(ref_face) # list of tupels (mv, ccx_face_nr)
if ref_face_volume_elements: # mesh with tetras
print('Use of getccxVolumesByFace() has returned volume elements of the ref_face!')
for ve in ref_face_volume_elements:
veID = ve[0]
ve_ref_face_nodes = []
for nodeID in femelement_table[veID]:
if nodeID in ref_face_nodes:
ve_ref_face_nodes.append(nodeID)
face_table[veID] = ve_ref_face_nodes # { volumeID : ( facenodeID, ... , facenodeID ) } only the ref_face nodes
else: # mesh with hexa or penta
print('Use of getccxVolumesByFace() has NOT returned volume elements of the ref_face! We try to use get_femvolumeelements_by_femfacenodes()!')
ref_face_volume_elements = get_femvolumeelements_by_femfacenodes(femelement_table, ref_face_nodes) # list of integer [mv]
for veID in ref_face_volume_elements:
ve_ref_face_nodes = []
for nodeID in femelement_table[veID]:
if nodeID in ref_face_nodes:
ve_ref_face_nodes.append(nodeID)
face_table[veID] = ve_ref_face_nodes # { volumeID : ( facenodeID, ... , facenodeID ) } only the ref_face nodes
face_table = build_mesh_faces_of_volume_elements(face_table, femelement_table) # we need to resort the nodes to make them build an element face
else: # the femmesh has face_data
faces = femmesh.getFacesByFace(ref_face) # (mv, mf)
for mf in faces:
face_table[mf] = femmesh.getElementNodes(mf)
elif is_face_femmesh(femmesh):
ref_face_nodes = femmesh.getNodesByFace(ref_face)
ref_face_elements = get_femelements_by_femnodes_std(femelement_table, ref_face_nodes)
for mf in ref_face_elements:
face_table[mf] = femelement_table[mf]
# print(face_table)
return face_table
def build_mesh_faces_of_volume_elements(face_table, femelement_table):
# node index of facenodes in femelementtable volume element
# if we know the position of the node we can build the element face out of the unsorted face nodes
face_nodenumber_table = {} # { volumeID : ( index, ... , index ) }
for veID in face_table:
face_nodenumber_table[veID] = []
for n in face_table[veID]:
index = femelement_table[veID].index(n)
# print(index)
face_nodenumber_table[veID].append(index + 1) # local node number = index + 1
# print('VolElement: ', veID)
# print(' --> ', femelement_table[veID])
# print(' --> ', face_table[veID])
# print(' --> ', face_nodenumber_table[veID])
for veID in face_nodenumber_table:
vol_node_ct = len(femelement_table[veID])
face_node_indexs = sorted(face_nodenumber_table[veID])
if vol_node_ct == 10: # tetra10 --> tria6 face
if face_node_indexs == [1, 2, 3, 5, 6, 7]: # node order of face in tetra10 volume element
node_numbers = (1, 2, 3, 5, 6, 7) # node order of a tria6 face of tetra10
elif face_node_indexs == [1, 2, 4, 5, 8, 9]:
node_numbers = (1, 4, 2, 8, 9, 5)
elif face_node_indexs == [1, 3, 4, 7, 8, 10]:
node_numbers = (1, 3, 4, 7, 10, 8)
elif face_node_indexs == [2, 3, 4, 6, 9, 10]:
node_numbers = (2, 4, 3, 9, 10, 6)
else:
FreeCAD.Console.PrintError("Error in build_mesh_faces_of_volume_elements(): hexa20: face not found!" + str(face_node_indexs) + "\n")
elif vol_node_ct == 4: # tetra4 --> tria3 face
if face_node_indexs == [1, 2, 3]: # node order of face in tetra4 volume element
node_numbers = (1, 2, 3) # node order of a tria3 face of tetra4
elif face_node_indexs == [1, 2, 4]:
node_numbers = (1, 4, 2, 8)
elif face_node_indexs == [1, 3, 4]:
node_numbers = (1, 3, 4)
elif face_node_indexs == [2, 3, 4]:
node_numbers = (2, 4, 3)
else:
FreeCAD.Console.PrintError("Error in build_mesh_faces_of_volume_elements(): hexa20: face not found!" + str(face_node_indexs) + "\n")
elif vol_node_ct == 20: # hexa20 --> quad8 face
if face_node_indexs == [1, 2, 3, 4, 9, 10, 11, 12]: # node order of face in hexa20 volume element
node_numbers = (1, 2, 3, 4, 9, 10, 11, 12) # node order of a quad8 face of hexa20
elif face_node_indexs == [5, 6, 7, 8, 13, 14, 15, 16]:
node_numbers = (5, 8, 7, 6, 16, 15, 14, 13)
elif face_node_indexs == [1, 2, 5, 6, 9, 13, 17, 18]:
node_numbers = (1, 5, 6, 2, 17, 13, 18, 9)
elif face_node_indexs == [3, 4, 7, 8, 11, 15, 19, 20]:
node_numbers = (3, 7, 8, 4, 19, 15, 20, 11)
elif face_node_indexs == [1, 4, 5, 8, 12, 16, 17, 20]:
node_numbers = (1, 4, 8, 5, 12, 20, 16, 17)
elif face_node_indexs == [2, 3, 6, 7, 10, 14, 18, 19]:
node_numbers = (2, 6, 7, 3, 18, 14, 19, 10)
else:
FreeCAD.Console.PrintError("Error in build_mesh_faces_of_volume_elements(): hexa20: face not found!" + str(face_node_indexs) + "\n")
elif vol_node_ct == 8: # hexa8 --> quad4 face
face_node_indexs = sorted(face_nodenumber_table[veID])
if face_node_indexs == [1, 2, 3, 4]: # node order of face in hexa8 volume element
node_numbers = (1, 2, 3, 4) # node order of a quad8 face of hexa8
elif face_node_indexs == [5, 6, 7, 8]:
node_numbers = (5, 8, 7, 6)
elif face_node_indexs == [1, 2, 5, 6]:
node_numbers = (1, 5, 6, 2)
elif face_node_indexs == [3, 4, 7, 8]:
node_numbers = (3, 7, 8, 4)
elif face_node_indexs == [1, 4, 5, 8]:
node_numbers = (1, 4, 8, 5)
elif face_node_indexs == [2, 3, 6, 7]:
node_numbers = (2, 6, 7, 3)
else:
FreeCAD.Console.PrintError("Error in build_mesh_faces_of_volume_elements(): hexa20: face not found!" + str(face_node_indexs) + "\n")
elif vol_node_ct == 15: # penta15 --> tria6 and quad8 faces
if face_node_indexs == [1, 2, 3, 7, 8, 9]: # node order of face in penta15 volume element
node_numbers = (1, 2, 3, 7, 8, 9) # node order of a tria6 face of penta15
elif face_node_indexs == [4, 5, 6, 10, 11, 12]:
node_numbers = (4, 6, 5, 12, 11, 10) # tria6
elif face_node_indexs == [1, 2, 4, 5, 7, 10, 13, 14]:
node_numbers = (1, 4, 5, 2, 13, 10, 14, 7) # quad8
elif face_node_indexs == [1, 3, 4, 6, 9, 12, 13, 15]:
node_numbers = (1, 3, 6, 4, 9, 15, 12, 13) # quad8
elif face_node_indexs == [2, 3, 5, 6, 8, 11, 14, 15]:
node_numbers = (2, 5, 6, 3, 14, 11, 15, 8) # quad8
else:
FreeCAD.Console.PrintError("Error in build_mesh_faces_of_volume_elements(): penta15: face not found!" + str(face_node_indexs) + "\n")
elif vol_node_ct == 6: # penta6 --> tria3 and quad4 faces
if face_node_indexs == [1, 2, 3]: # node order of face in penta6 volume element
node_numbers = (1, 2, 3) # node order of a tria3 face of penta6
elif face_node_indexs == [4, 5, 6]:
node_numbers = (4, 6, 5) # tria3
elif face_node_indexs == [1, 2, 4, 5]: