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tamaas/tests/test_saturated_pressure.py
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test_saturated_pressure.py
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# -*- coding: utf-8 -*-
#
# Copyright (©) 2016-2021 EPFL (École Polytechnique Fédérale de Lausanne),
# Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
from __future__ import print_function, division
import numpy as np
import tamaas as tm
import pytest
@pytest.fixture(scope="module")
def saturated():
grid_size = 256
load = 0.06
p_sat = 0.4
iso = tm.Isopowerlaw2D()
iso.q0 = 4
iso.q1 = 4
iso.q2 = 16
iso.hurst = 0.8
sg = tm.SurfaceGeneratorFilter2D([grid_size] * 2)
sg.random_seed = 2
sg.spectrum = iso
surface = sg.buildSurface()
surface *= 0.01 / iso.rmsHeights()
surface -= np.max(surface)
model = tm.ModelFactory.createModel(tm.model_type.basic_2d,
[1., 1.], [grid_size, grid_size])
model.E = 1.
model.nu = 0
solver = tm.KatoSaturated(model, surface, 1e-12, p_sat)
solver.max_iter = 6000
solver.solve(load)
return model, p_sat, load
def test_mean_pressure(saturated):
model, _, load = saturated
assert abs(model.traction.mean() - load) / load < 1e-12
def test_max_pressure(saturated):
model, p_sat, _ = saturated
assert abs(model.traction.max() - p_sat) / p_sat < 1e-12
def test_orthogonality(saturated):
model, _, _ = saturated
error = np.max(model.traction * model['gap']) \
/ (model.traction.max() * model['gap'].max())
assert error < 4e-8
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