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fix: remove factor 2 in 'middle' coefficient of explicit part (closed)

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test: add test case with homogeneous field and same values as const
boundary condition
This commit is contained in:
Max Lübke 2023-12-19 16:04:57 +01:00
parent f651c1d158
commit 61d6cfc5cb
2 changed files with 33 additions and 1 deletions
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2
include/tug/Core/BTCS.hpp
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@ -140,7 +140,7 @@ constexpr T calcExplicitConcentrationsBoundaryConstant(T conc_center, T conc_bc,
T alpha_neighbor, T sy) { T alpha_neighbor, T sy) {
return sy * calcAlphaIntercell(alpha_center, alpha_neighbor) * conc_center + return sy * calcAlphaIntercell(alpha_center, alpha_neighbor) * conc_center +
(1 - sy * (calcAlphaIntercell(alpha_center, alpha_center) + (1 - sy * (calcAlphaIntercell(alpha_center, alpha_center) +
2 * alpha_center)) * alpha_center)) *
conc_center + conc_center +
sy * alpha_center * conc_bc; sy * alpha_center * conc_bc;
} }

32
test/testSimulation.cpp
View File

@ -1,5 +1,6 @@
#include "TestUtils.hpp" #include "TestUtils.hpp"
#include <Eigen/src/Core/Matrix.h>
#include <doctest/doctest.h> #include <doctest/doctest.h>
#include <stdio.h> #include <stdio.h>
#include <string> #include <string>
@ -119,3 +120,34 @@ TEST_CASE("Simulation environment") {
CHECK_THROWS(sim.setTimestep(-0.3)); CHECK_THROWS(sim.setTimestep(-0.3));
} }
} }
TEST_CASE("Closed Boundaries - no change expected") {
constexpr std::uint32_t nrows = 5;
constexpr std::uint32_t ncols = 5;
tug::Grid64 grid(nrows, ncols);
auto concentrations = Eigen::MatrixXd::Constant(nrows, ncols, 1.0);
auto alphax = Eigen::MatrixXd::Constant(nrows, ncols, 1E-5);
auto alphay = Eigen::MatrixXd::Constant(nrows, ncols, 1E-5);
grid.setConcentrations(concentrations);
grid.setAlpha(alphax, alphay);
tug::Boundary bc(grid);
bc.setBoundarySideConstant(tug::BC_SIDE_LEFT, 1.0);
bc.setBoundarySideConstant(tug::BC_SIDE_RIGHT, 1.0);
bc.setBoundarySideConstant(tug::BC_SIDE_TOP, 1.0);
bc.setBoundarySideConstant(tug::BC_SIDE_BOTTOM, 1.0);
tug::Simulation<double> sim(grid, bc);
sim.setTimestep(1);
sim.setIterations(1);
MatrixXd input_values(concentrations);
sim.run();
CHECK(checkSimilarityV2(input_values, grid.getConcentrations(), 1E-12) ==
true);
}