feat(stroid): first working version

stroid generates o-grid topologies with proper boundary conditions applied. Currently the external domain does not work, this will be addressed in the next commit.
2026-01-30 08:59:34 -05:00
parent 70fa469baa
commit 58f59516ec
27 changed files with 529 additions and 140 deletions
--- a/src/lib/topology/topology.cpp
+++ b/src/lib/topology/topology.cpp
@@ -0,0 +1,75 @@
+#include "mfem.hpp"
+#include <vector>
+#include <memory>
+
+#include "stroid/config/config.h"
+#include "fourdst/config/config.h"
+
+namespace stroid::topology {
+
+    std::unique_ptr<mfem::Mesh> BuildSkeleton(const fourdst::config::Config<config::MeshConfig> & config) {
+        int nVert = config->include_external_domain ? 24 : 16;
+        int nElem = config->include_external_domain ? 13 : 7;
+        int nBev  = 6;
+
+        auto mesh = std::make_unique<mfem::Mesh>(3, nVert, nElem, nBev, 3);
+
+        auto add_box = [&](double scale) {
+            for (const double z : {-scale, scale})
+                for (const double y : {-scale, scale})
+                    for (const double x : {-scale, scale})
+                        mesh->AddVertex(x, y, z);
+        };
+
+        add_box(config->r_core);
+        add_box(config->r_star);
+        if (config->include_external_domain) {
+            add_box(config->r_infinity);
+        }
+
+        const int core_v[8] = {0, 1, 3, 2, 4, 5, 7, 6};
+        mesh->AddHex(core_v, 1);
+
+        int shells[6][8] = {
+            {8, 9, 11, 10, 0, 1, 3, 2},
+            {4, 5, 7, 6, 12, 13, 15, 14}, // +Z face
+            {0, 1, 5, 4, 8, 9, 13, 12},   // -Y face
+            {10, 11, 15, 14, 2, 3, 7, 6},
+            {1, 3, 7, 5, 9, 11, 15, 13},  // +X face
+            {0, 4, 6, 2, 8, 12, 14, 10}   // -X face
+        };
+        for (const auto & shell : shells) mesh->AddHex(shell, 2);
+
+        const int bdr_quads[6][4] = {
+            {12, 13, 15, 14},
+            {13, 9, 11, 15},
+            {9, 8, 10, 11},
+            {8, 12, 14, 10},
+            {8, 9, 13, 12},
+            {14, 15, 11, 10}
+        };
+
+        for (const auto& bdr: bdr_quads) {
+            mesh->AddBdrQuad(bdr, 1);
+        }
+
+        return mesh;
+    }
+
+    void Finalize(mfem::Mesh& mesh, const fourdst::config::Config<config::MeshConfig> &config) {
+        mesh.FinalizeTopology();
+        mesh.Finalize();
+        mesh.CheckElementOrientation(true);
+        mesh.CheckBdrElementOrientation(true);
+        for (int i = 0; i < config->refinement_levels; ++i) {
+            mesh.UniformRefinement();
+        }
+
+        if (!mesh.Conforming()) {
+            std::cerr << "WARNING: Mesh has been detected to be non conforming!" << std::endl;
+        }
+
+
+    }
+
+}