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rAKA/test/test_python_interface/test_boundary_condition_functors.py
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test_boundary_condition_functors.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# ------------------------------------------------------------------------------
__author__ = "Lucas Frérot"
__copyright__ = "Copyright (C) 2016-2018, EPFL (Ecole Polytechnique Fédérale" \
" de Lausanne) Laboratory (LSMS - Laboratoire de Simulation" \
" en Mécanique des Solides)"
__credits__ = ["Lucas Frérot"]
__license__ = "L-GPLv3"
__maintainer__ = "Lucas Frérot"
__email__ = "lucas.frerot@epfl.ch"
# ------------------------------------------------------------------------------
import sys
import os
import numpy as np
import akantu as aka
######################################################################
# Boundary conditions founctors
######################################################################
class FixedValue:
"""Functor for Dirichlet boundary conditions"""
def __init__(self, value, axis):
self.value = value
axis_dict = {'x':0, 'y':1, 'z':2}
self.axis = axis_dict[axis]
def operator(self, node, flags, primal, coord):
primal[self.axis] = self.value
flags[self.axis] = True
#---------------------------------------------------------------------
class FromStress:
"""Functor for Neumann boundary conditions"""
def __init__(self, stress):
self.stress = stress
def operator(self, quad_point, dual, coord, normals):
dual[:] = np.dot(self.stress,normals)
######################################################################
def main():
aka.parseInput("input_test.dat")
mesh = aka.Mesh(2)
mesh.read('mesh_dcb_2d.msh')
model = aka.SolidMechanicsModel(mesh)
model.initFull()
model.applyDirichletBC(FixedValue(0.0, 'x'), "edge")
stress = np.array([[1, 0],
[0, 0]])
blocked_nodes = mesh.getElementGroup("edge").getNodeGroup().getNodes().flatten()
boundary = model.getBlockedDOFs()
# Testing that nodes are correctly blocked
for n in blocked_nodes:
if not boundary[n, 0]:
return -1
boundary.fill(False)
model.applyNeumannBC(FromStress(stress), "edge")
force = model.getExternalForce()
# Checking that nodes have a force in the correct direction
for n in blocked_nodes:
if not force[n, 0] > 0:
return -1
return 0
if __name__ == "__main__":
sys.exit(main())
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