jakob.schratter/SciFEM-Project_CoffeeMugSimulation_Celebic-Schratter
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added subdomain indexing for outer edges, for use in robin BC

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jakob.schratter 2026-01-24 14:26:22 +01:00
commit 99b46ad7ec
5 changed files with 143 additions and 33 deletions
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27
mgrid_2/main.cpp
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@ -20,24 +20,24 @@ int main(int argc, char **argv )
#undef MG
#ifndef MG
// Jacobi iteration
int nrefine = 0;
if (argc > 1) nrefine = atoi(argv[1]);
//int nrefine = 0;
//if (argc > 1) nrefine = atoi(argv[1]);
// generating the mesh
Mesh const mesh_c("../generate_mesh/coffee_cup.txt", "../generate_mesh/coffee_cup_sd.txt");
//Mesh const mesh_c("square_tiny.txt");
bool ba = mesh_c.checkObtuseAngles();
if (ba) cout << "mesh corrected" << endl;
//mesh_c.DebugEdgeBased();
gMesh_Hierarchy ggm(mesh_c, nrefine);
const Mesh &mesh = ggm.finest();
//gMesh_Hierarchy ggm(mesh_c, nrefine);
//const Mesh &mesh = ggm.finest();
//mesh.Debug();
//mesh.DebugEdgeBased();
// Initializing FEM matrix !pattern! (only zero entries now)
FEM_Matrix SK(mesh); // CRS matrix
FEM_Matrix SK(mesh_c); // CRS matrix
//SK.writeBinary("sparseMatrix.bin");
//SK.Debug();
@ -50,19 +50,20 @@ int main(int argc, char **argv )
//SK.Debug();
// Calculate RHS
SK.CalculateRHS(fv, [](double x, double y) { // rhs
return std::sin(M_PI * 2.5 * y) * (M_PI * M_PI * 2.5 * 2.5 * x * x - 2); });
// SK.CalculateRHS(fv, [](double x, double y) { // rhs
// return std::sin(M_PI * 2.5 * y) * (M_PI * M_PI * 2.5 * 2.5 * x * x - 2); });
SK.CalculateRHS(fv, [](double x, double y) {return 0;});
//SK.CheckRowSum();
SK.CheckMatrix();
// Initialize temperature
vector<double> uv(SK.Nrows(), 0.0); // temperature
mesh.Init_Solution_mult(uv, 0, [](double x, double y) -> double { return 18; }); // mug
mesh.Init_Solution_mult(uv, 1, [](double x, double y) -> double { return 80; }); // fluid
mesh.Init_Solution_mult(uv, 2, [](double x, double y) -> double { return 18; }); // air
mesh_c.Init_Solution_mult(uv, 0, [](double x, double y) -> double { return 18; }); // mug
mesh_c.Init_Solution_mult(uv, 1, [](double x, double y) -> double { return 80; }); // fluid
mesh_c.Init_Solution_mult(uv, 2, [](double x, double y) -> double { return 18; }); // air
// Apply BC
SK.ApplyDirichletBC(uv, fv);
SK.ApplyRobinBC_mult(uv, fv, 18.0);
// Solve
@ -83,7 +84,7 @@ int main(int argc, char **argv )
auto [val, idx] = findLargestAbsError(exact_sol, uv, 1e+6, 100);
//mesh.Visualize(getAbsError(exact_sol, uv));
mesh.Visualize(uv);
mesh_c.Visualize(uv);
#else
// multigrid iteration