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-rw-r--r--boltzgen/kernel/template/example.cpp.mako172
1 files changed, 172 insertions, 0 deletions
diff --git a/boltzgen/kernel/template/example.cpp.mako b/boltzgen/kernel/template/example.cpp.mako
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+++ b/boltzgen/kernel/template/example.cpp.mako
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+% if 'moments_vtk' in extras:
+void collect_moments_to_vtk(const std::string& path, ${float_type}* f) {
+ std::ofstream fout;
+ fout.open(path.c_str());
+
+ fout << "# vtk DataFile Version 3.0\n";
+ fout << "lbm_output\n";
+ fout << "ASCII\n";
+ fout << "DATASET RECTILINEAR_GRID\n";
+% if descriptor.d == 2:
+ fout << "DIMENSIONS " << ${geometry.size_x-2} << " " << ${geometry.size_y-2} << " 1" << "\n";
+% else:
+ fout << "DIMENSIONS " << ${geometry.size_x-2} << " " << ${geometry.size_y-2} << " " << ${geometry.size_z-2} << "\n";
+% endif
+
+ fout << "X_COORDINATES " << ${geometry.size_x-2} << " float\n";
+ for( std::size_t x = 1; x < ${geometry.size_x-1}; ++x ) {
+ fout << x << " ";
+ }
+
+ fout << "\nY_COORDINATES " << ${geometry.size_y-2} << " float\n";
+ for( std::size_t y = 1; y < ${geometry.size_y-1}; ++y ) {
+ fout << y << " ";
+ }
+
+% if descriptor.d == 2:
+ fout << "\nZ_COORDINATES " << 1 << " float\n";
+ fout << 0 << "\n";
+ fout << "POINT_DATA " << ${(geometry.size_x-2) * (geometry.size_y-2)} << "\n";
+% else:
+ fout << "\nZ_COORDINATES " << ${geometry.size_z-2} << " float\n";
+ for( std::size_t z = 1; z < ${geometry.size_z-1}; ++z ) {
+ fout << z << " ";
+ }
+ fout << "\nPOINT_DATA " << ${(geometry.size_x-2) * (geometry.size_y-2) * (geometry.size_z-2)} << "\n";
+% endif
+
+ ${float_type} rho;
+ ${float_type} u[${descriptor.d}];
+
+ fout << "VECTORS velocity float\n";
+% if descriptor.d == 2:
+ for ( std::size_t y = 1; y < ${geometry.size_y-1}; ++y ) {
+ for ( std::size_t x = 1; x < ${geometry.size_x-1}; ++x ) {
+ collect_moments(f, x*${geometry.size_y}+y, rho, u);
+ fout << u[0] << " " << u[1] << " 0\n";
+ }
+ }
+% else:
+ for ( std::size_t z = 1; z < ${geometry.size_z-1}; ++z ) {
+ for ( std::size_t y = 1; y < ${geometry.size_y-1}; ++y ) {
+ for ( std::size_t x = 1; x < ${geometry.size_x-1}; ++x ) {
+ collect_moments(f, x*${geometry.size_y*geometry.size_z}+y*${geometry.size_z}+z, rho, u);
+ fout << u[0] << " " << u[1] << " " << u[2] << "\n";
+ }
+ }
+ }
+% endif
+
+ fout << "SCALARS density float 1\n";
+ fout << "LOOKUP_TABLE default\n";
+% if descriptor.d == 2:
+ for ( std::size_t y = 1; y < ${geometry.size_y-1}; ++y ) {
+ for ( std::size_t x = 1; x < ${geometry.size_x-1}; ++x ) {
+ collect_moments(f, x*${geometry.size_y}+y, rho, u);
+ fout << rho << "\n";
+ }
+ }
+% else:
+ for ( std::size_t z = 1; z < ${geometry.size_z-1}; ++z ) {
+ for ( std::size_t y = 1; y < ${geometry.size_y-1}; ++y ) {
+ for ( std::size_t x = 1; x < ${geometry.size_x-1}; ++x ) {
+ collect_moments(f, x*${geometry.size_y*geometry.size_z}+y*${geometry.size_z}+z, rho, u);
+ fout << rho << "\n";
+ }
+ }
+ }
+% endif
+
+ fout.close();
+}
+% endif
+
+void test_ldc(std::size_t nStep)
+{
+ auto f_a = std::make_unique<${float_type}[]>(${geometry.volume*descriptor.q});
+ auto f_b = std::make_unique<${float_type}[]>(${geometry.volume*descriptor.q});
+
+ ${float_type}* f_prev = f_a.get();
+ ${float_type}* f_next = f_b.get();
+
+ std::vector<std::size_t> bulk;
+ std::vector<std::size_t> lid_bc;
+ std::vector<std::size_t> box_bc;
+
+ for (int iX = 1; iX < ${geometry.size_x-1}; ++iX) {
+ for (int iY = 1; iY < ${geometry.size_y-1}; ++iY) {
+% if descriptor.d == 2:
+ const std::size_t iCell = iX*${geometry.size_y} + iY;
+ if (iY == ${geometry.size_y-2}) {
+ lid_bc.emplace_back(iCell);
+ } else if (iX == 1 || iX == ${geometry.size_x-2} || iY == 1) {
+ box_bc.emplace_back(iCell);
+ } else {
+ bulk.emplace_back(iCell);
+ }
+% elif descriptor.d == 3:
+ for (int iZ = 0; iZ < ${geometry.size_z}; ++iZ) {
+ const std::size_t iCell = iX*${geometry.size_y*geometry.size_z} + iY*${geometry.size_z} + iZ;
+ if (iZ == ${geometry.size_z-2}) {
+ lid_bc.emplace_back(iCell);
+ } else if (iX == 1 || iX == ${geometry.size_x-2} || iY == 1 || iY == ${geometry.size_y-2} || iZ == 1) {
+ box_bc.emplace_back(iCell);
+ } else {
+ bulk.emplace_back(iCell);
+ }
+ }
+% endif
+ }
+ }
+
+ for (std::size_t iCell = 0; iCell < ${geometry.volume}; ++iCell) {
+ equilibrilize(f_prev, f_next, iCell);
+ }
+
+ const auto start = std::chrono::high_resolution_clock::now();
+
+ for (std::size_t iStep = 0; iStep < nStep; ++iStep) {
+ if (iStep % 2 == 0) {
+ f_next = f_a.get();
+ f_prev = f_b.get();
+ } else {
+ f_next = f_b.get();
+ f_prev = f_a.get();
+ }
+
+% if 'omp_parallel_for' in extras:
+#pragma omp parallel for
+% endif
+ for (std::size_t i = 0; i < bulk.size(); ++i) {
+ collide_and_stream(f_next, f_prev, bulk[i]);
+ }
+ ${float_type} u[${descriptor.d}] { 0. };
+% if 'omp_parallel_for' in extras:
+#pragma omp parallel for
+% endif
+ for (std::size_t i = 0; i < box_bc.size(); ++i) {
+ velocity_momenta_boundary(f_next, f_prev, box_bc[i], u);
+ }
+ u[0] = 0.05;
+% if 'omp_parallel_for' in extras:
+#pragma omp parallel for
+% endif
+ for (std::size_t i = 0; i < lid_bc.size(); ++i) {
+ velocity_momenta_boundary(f_next, f_prev, lid_bc[i], u);
+ }
+ }
+
+ auto duration = std::chrono::duration_cast<std::chrono::duration<double>>(
+ std::chrono::high_resolution_clock::now() - start);
+
+ std::cout << "#bulk : " << bulk.size() << std::endl;
+ std::cout << "#lid : " << lid_bc.size() << std::endl;
+ std::cout << "#wall : " << box_bc.size() << std::endl;
+ std::cout << "#steps : " << nStep << std::endl;
+ std::cout << std::endl;
+ std::cout << "MLUPS : " << nStep*${geometry.volume}/(1e6*duration.count()) << std::endl;
+
+% if 'moments_vtk' in extras:
+ collect_moments_to_vtk("test.vtk", f_next);
+% endif
+}