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cellToFaceVariable.py
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cellToFaceVariable.py
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#!/usr/bin/env python
## -*-Pyth-*-
# ###################################################################
# FiPy - Python-based finite volume PDE solver
#
# FILE: "cellToFaceVariable.py"
#
# Author: Jonathan Guyer <guyer@nist.gov>
# Author: Daniel Wheeler <daniel.wheeler@nist.gov>
# Author: James Warren <jwarren@nist.gov>
# mail: NIST
# www: http://www.ctcms.nist.gov/fipy/
#
# ========================================================================
# This software was developed at the National Institute of Standards
# and Technology by employees of the Federal Government in the course
# of their official duties. Pursuant to title 17 Section 105 of the
# United States Code this software is not subject to copyright
# protection and is in the public domain. FiPy is an experimental
# system. NIST assumes no responsibility whatsoever for its use by
# other parties, and makes no guarantees, expressed or implied, about
# its quality, reliability, or any other characteristic. We would
# appreciate acknowledgement if the software is used.
#
# This software can be redistributed and/or modified freely
# provided that any derivative works bear some notice that they are
# derived from it, and any modified versions bear some notice that
# they have been modified.
# ========================================================================
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# ###################################################################
##
__all__ = []
from fipy.variables.faceVariable import FaceVariable
from fipy.tools import numerix
class _CellToFaceVariable(FaceVariable):
def __init__(self, var):
FaceVariable.__init__(self, mesh=var.mesh, elementshape=var.shape[:-1])
self.var = self._requires(var)
def _calcValue(self):
alpha = self.mesh._faceToCellDistanceRatio
id1, id2 = self.mesh._adjacentCellIDs
return self._calcValue_(alpha=alpha, id1=id1, id2=id2)
def release(self, constraint):
"""Remove `constraint` from `self`
>>> from fipy import *
>>> m = Grid1D(nx=3)
>>> v = CellVariable(mesh=m, value=m.cellCenters[0])
>>> c0 = Constraint(0., where=m.facesLeft)
>>> v.constrain(c0)
>>> c1 = Constraint(3., where=m.facesRight)
>>> v.faceValue.constrain(c1)
>>> print v.faceValue
[ 0. 1. 2. 3.]
>>> v.faceValue.release(constraint=c0)
>>> print v.faceValue
[ 0.5 1. 2. 3. ]
>>> v.faceValue.release(constraint=c1)
>>> print v.faceValue
[ 0.5 1. 2. 2.5]
"""
try:
super(FaceVariable, self).constraints.remove(constraint)
except ValueError:
self.var.release(constraint=constraint)
@property
def constraints(self):
if hasattr(self.var, "faceConstraints"):
faceConstraints = self.var.faceConstraints
else:
faceConstraints = []
return super(_CellToFaceVariable, self).constraints + faceConstraints
@property
def constraintMask(self):
if hasattr(self, '_constraintMask'):
if hasattr(self.var, 'faceConstraints'):
for constraint in self.var.faceConstraints:
self._constraintMask._requires(constraint.where)
return super(_CellToFaceVariable, self).constraintMask
def __getstate__(self):
return dict(var=self.var)
def __setstate__(self, dict):
self.__init__(**dict)
def _test():
import fipy.tests.doctestPlus
return fipy.tests.doctestPlus.testmod()
if __name__ == "__main__":
_test()