write_constraint_rigidbody.py

# ***************************************************************************
# *   Copyright (c) 2022 Ajinkya Dahale <dahale.a.p@gmail.com>              *
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# *   This file is part of the FreeCAD CAx development system.              *
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__title__ = "FreeCAD FEM calculix constraint rigid body"
__author__ = "Ajinkya Dahale"
__url__ = "https://www.freecadweb.org"


def get_analysis_types():
    return "all"    # write for all analysis types


def get_sets_name():
    return "constraints_rigidbody_node_sets"


def get_constraint_title():
    return "Rigid Body Constraints"


def get_before_write_meshdata_constraint():
    return ""


def get_after_write_meshdata_constraint():
    return ""


def get_before_write_constraint():
    return ""


def get_after_write_constraint():
    return ""


def write_meshdata_constraint(f, femobj, rb_obj, ccxwriter):
    f.write("*NSET,NSET=" + rb_obj.Name + "\n")
    for n in femobj["Nodes"]:
        f.write("{},\n".format(n))


def write_constraint(f, femobj, rb_obj, ccxwriter):

    # floats read from ccx should use {:.13G}, see comment in writer module
    is_ref_bc_defined = any((rb_obj.xDisplacement,
                             rb_obj.yDisplacement,
                             rb_obj.zDisplacement,
                             rb_obj.xLoad,
                             rb_obj.yLoad,
                             rb_obj.zLoad))

    is_rot_bc_defined = any((rb_obj.xRotation,
                             rb_obj.yRotation,
                             rb_obj.zRotation,
                             rb_obj.xMoment,
                             rb_obj.yMoment,
                             rb_obj.zMoment))

    # FIXME: This needs to be implemented
    ref_node_idx = -1
    rot_node_idx = -1

    kw_line = "*RIGID BODY,NSET={}".format(rb_obj.Name)

    if is_ref_bc_defined:
        kw_line = kw_line + ",REF NODE={}".format(ref_node_idx)

    if is_rot_bc_defined:
        kw_line = kw_line + ",ROT NODE={}".format(rot_node_idx)

    f.write(kw_line + "\n")

    # TODO: Displacement definitions need fixing
    if is_ref_bc_defined:
        f.write("*CLOAD\n")
        f.write("{},1,{}\n".format(ref_node_idx, rb_obj.xLoad))
        f.write("{},2,{}\n".format(ref_node_idx, rb_obj.yLoad))
        f.write("{},3,{}\n".format(ref_node_idx, rb_obj.zLoad))

    if is_rot_bc_defined:
        f.write("*CLOAD\n")
        f.write("{},1,{}\n".format(rot_node_idx, rb_obj.xMoment))
        f.write("{},2,{}\n".format(rot_node_idx, rb_obj.yMoment))
        f.write("{},3,{}\n".format(rot_node_idx, rb_obj.zMoment))