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test_boundary_condition_functors.py
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Sun, Jun 30, 09:58

test_boundary_condition_functors.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# ===============================================================================
# @file test_boundary_condition_functors.py
#
# @author Lucas Frérot <lucas.frerot@epfl.ch>
#
# @date creation: Thu Feb 11 2016
#
# @brief Testing the apply*BC functions in python interface
#
# @section LICENSE
#
# Copyright (©) 2016 EPFL (Ecole Polytechnique Fédérale de Lausanne)
# Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
#
# Akantu is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# Akantu 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Akantu. If not, see <http://www.gnu.org/licenses/>.
#
# ===============================================================================
from __future__ import print_function
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.initialize("input_test.dat")
mesh = aka.Mesh(2)
mesh.read('mesh_dcb_2d.msh')
mesh.createGroupsFromStringMeshData("physical_names")
model = aka.SolidMechanicsModel(mesh, 2)
model.initFull()
model.applyDirichletBC(FixedValue(0.0, 'x'), "edge")
stress = np.array([[1, 0],
[0, 0]])
blocked_nodes = mesh.getElementGroup("edge").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.getForce()
# Checking that nodes have a force in the correct direction
for n in blocked_nodes:
if not force[n, 0] > 0:
return -1
aka.finalize()
return 0
if __name__ == "__main__":
sys.exit(main())

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