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feat(topology): vacuum coordinate and multi block

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Two major changes in this version. First stroid now embeds a vacuum coordinate as part of its StroidMesh file (this is a packed set of mfem meshes and GridFunction). This is a logical coordinate from 0 at the stellar surface to 1 at the mesh surface / compactified infinity which can be used by consumers to much more stablly infer position in the vacuum region. Second, there is a new topology backend, multi_block, which has been made the default. See the readme for more information but the basic jist is that multi_block addes 6 transition blocks onto the edge of the core domain. This allows for a much more well conditioned transition from the internal cartesien region to the external spherical region. The mesh conditioning improves by roughly a factor of 1000 for the same refinement level when compared to the legacy topology. The legacy topology is maintained as a option if core_mapping is set to spherified in the config.
This commit is contained in:
Emily Boudreaux
2026-09-09 08:11:08 -04:00
parent db727ebd7b
commit a5905e5fed
27 changed files with 1693 additions and 183 deletions
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61
src/lib/topology/topology.cpp
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@@ -1,6 +1,8 @@
#include "mfem.hpp"
#include <vector>
#include <memory>
#include <cmath>
#include <stdexcept>
#include "stroid/config/config.h"
#include "fourdst/config/config.h"
@@ -8,9 +10,31 @@
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 = config->include_external_domain ? 12 : 6;
const std::string core_mapping = config->core_mapping.value_or("spherified");
if (core_mapping != "spherified" && core_mapping != "multi_block") {
throw std::invalid_argument("Unknown core_mapping: " + core_mapping);
}
const bool multi_block = core_mapping == "multi_block";
const bool include_external_domain = config->include_external_domain.value_or(true);
if (multi_block) {
const double r_core = config->r_core.value();
const double r_star = config->r_star.value();
const double r_infinity = config->r_infinity.value_or(6.0);
const double flattening = config->flattening.value();
if (!std::isfinite(r_core) || !std::isfinite(r_star) || r_core <= 0.0 || r_star <= r_core ||
(include_external_domain && (!std::isfinite(r_infinity) || r_infinity <= r_star))) {
throw std::invalid_argument("multi_block requires 0 < r_core < r_star < r_infinity (when external).");
}
if (!std::isfinite(flattening) || flattening >= 1.0) {
throw std::invalid_argument("multi_block requires finite flattening < 1.");
}
}
const int offset = multi_block ? 8 : 0;
int nVert = (include_external_domain ? 24 : 16) + offset;
int nElem = (include_external_domain ? 13 : 7) + (multi_block ? 6 : 0);
int nBev = include_external_domain ? 12 : 6;
auto mesh = std::make_unique<mfem::Mesh>(3, nVert, nElem, nBev, 3);
@@ -21,9 +45,12 @@ namespace stroid::topology {
mesh->AddVertex(x, y, z);
};
if (multi_block) {
add_box(config->r_core.value() / 2.0);
}
add_box(config->r_core.value());
add_box(config->r_star.value());
if (config->include_external_domain) {
if (include_external_domain) {
add_box(config->r_infinity.value());
}
@@ -38,11 +65,18 @@ namespace stroid::topology {
{1, 3, 7, 5, 9, 11, 15, 13}, // +X face
{0, 4, 6, 2, 8, 12, 14, 10} // -X face
};
if (multi_block) {
for (const auto & shell : stellar_shells) {
mesh->AddHex(shell.data(), config->core_id.value());
}
}
for (const auto & shell : stellar_shells) {
mesh->AddHex(shell.data(), config->envelope_id.value());
auto vertices = shell;
for (auto & vertex : vertices) vertex += offset;
mesh->AddHex(vertices.data(), config->envelope_id.value());
}
if (config->include_external_domain) {
if (include_external_domain) {
std::vector<std::array<int, 8>> vacuum_shells;
vacuum_shells.push_back({8, 9, 13, 12, 16, 17, 21, 20});
vacuum_shells.push_back({9, 11, 15, 13, 17, 19, 23, 21});
@@ -51,7 +85,9 @@ namespace stroid::topology {
vacuum_shells.push_back({12, 13, 15, 14, 20, 21, 23, 22});
vacuum_shells.push_back({10, 11, 9, 8, 18, 19, 17, 16});
for (const auto & shell : vacuum_shells) {
mesh->AddHex(shell.data(), config->vacuum_id.value());
auto vertices = shell;
for (auto & vertex : vertices) vertex += offset;
mesh->AddHex(vertices.data(), config->vacuum_id.value());
}
}
@@ -66,10 +102,12 @@ namespace stroid::topology {
};
for (const auto& bdr: surface_bdr_quads) {
mesh->AddBdrQuad(bdr, config->surface_bdr_id.value());
int vertices[4];
for (int i = 0; i < 4; ++i) vertices[i] = bdr[i] + offset;
mesh->AddBdrQuad(vertices, config->surface_bdr_id.value());
}
if (config->include_external_domain) {
if (include_external_domain) {
const int inf_bdr_quads[6][4] = {
{16, 17, 21, 20},
{17, 19, 23, 21},
@@ -80,13 +118,16 @@ namespace stroid::topology {
};
for (const auto& bdr: inf_bdr_quads) {
mesh->AddBdrQuad(bdr, config->inf_bdr_id.value());
int vertices[4];
for (int i = 0; i < 4; ++i) vertices[i] = bdr[i] + offset;
mesh->AddBdrQuad(vertices, config->inf_bdr_id.value());
}
}
return mesh;
}
// ReSharper disable once CppUseInternalLinkage
void Finalize(mfem::Mesh& mesh, const fourdst::config::Config<config::MeshConfig> &config) {
mesh.FinalizeTopology();
mesh.Finalize();