124 lines
4.2 KiB
C++
124 lines
4.2 KiB
C++
module;
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#include <mfem.hpp>
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module mean_field;
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namespace mean_field::integrators {
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GravityForceIntegrator::GravityForceIntegrator(
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const mapping::DomainMapper& map,
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const mfem::GridFunction& phi
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): m_map(map), m_phi(&phi) {}
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void GravityForceIntegrator::SetPotential(const mfem::GridFunction& phi) { m_phi = φ };
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void GravityForceIntegrator::AssembleElementVector(
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const mfem::Array<const mfem::FiniteElement *> &el,
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mfem::ElementTransformation &Tr,
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const mfem::Array<const mfem::Vector *> &elfun,
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const mfem::Array<mfem::Vector *> &elvec
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) {
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if (utils::is_vacuum(Tr, elvec)) {
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return;
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}
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const mfem::FiniteElement* fe_v = el[0];
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const mfem::FiniteElement* fe_rho = el[1];
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const int dof_v = fe_v->GetDof();
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const int dof_rho = fe_rho->GetDof();
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const int dim = Tr.GetSpaceDim();
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const mfem::Vector& rho_dofs = *elfun[1];
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mfem::Vector& r_v = *elvec[0];
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r_v.SetSize(dof_v * dim);
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r_v = 0.0;
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if (elvec[1]) {
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elvec[1]->SetSize(dof_rho);
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*elvec[1] = 0.0;
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}
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mfem::Vector shape_v(dof_v), shape_rho(dof_rho);
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mfem::Vector grad_phi_ref(dim), grad_phi_phys(dim), grad_phi_elem(dim);
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const mfem::IntegrationRule* ir = &mfem::IntRules.Get(fe_v->GetGeomType(), 2 * fe_v->GetOrder());
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for (int q = 0; q < ir->GetNPoints(); ++q) {
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const mfem::IntegrationPoint& ip = ir->IntPoint(q);
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Tr.SetIntPoint(&ip);
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auto [J_inv, detJ, weight] = m_map.GetQuadratureContext(Tr, ip);
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m_phi->GetGradient(Tr, grad_phi_elem);
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mfem::DenseMatrix J_map(dim, dim), J_map_inv(dim, dim);
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m_map.ComputeJacobian(Tr, J_map);
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mfem::CalcInverse(J_map, J_map_inv);
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J_map_inv.MultTranspose(grad_phi_elem, grad_phi_phys);
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fe_v->CalcShape(ip, shape_v);
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fe_rho->CalcShape(ip, shape_rho);
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double rho_val = 0.0;
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for (int i = 0; i < dof_rho; ++i) {
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rho_val += rho_dofs(i) * shape_rho(i);
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}
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for (int i = 0; i < dof_v; ++i) {
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for (int c = 0; c < dim; ++c) {
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r_v(i + c * dof_v) += shape_v(i) * rho_val * grad_phi_phys(c) * weight;
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}
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}
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}
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}
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void GravityForceIntegrator::AssembleElementGrad(
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const mfem::Array<const mfem::FiniteElement *> &el,
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mfem::ElementTransformation &Tr,
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const mfem::Array<const mfem::Vector *> &elfun,
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const mfem::Array2D<mfem::DenseMatrix *> &elmats
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) {
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const mfem::FiniteElement* fe_v = el[0];
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const mfem::FiniteElement* fe_rho = el[1];
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const int dof_v = fe_v->GetDof();
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const int dof_rho = fe_rho->GetDof();
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const int dim = Tr.GetSpaceDim();
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mfem::DenseMatrix* dv_dv = elmats(0, 0);
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mfem::DenseMatrix* dv_drho = elmats(0, 1);
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if (dv_dv) *dv_dv = 0.0;
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if (dv_drho) *dv_drho = 0.0;
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if (!dv_drho) return;
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mfem::Vector shape_v(dof_v), shape_rho(dof_rho);
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mfem::Vector grad_phi_ref(dim), grad_phi_phys(dim), grad_phi_elem(dim);
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const mfem::IntegrationRule* ir = &mfem::IntRules.Get(fe_v->GetGeomType(), 2 * fe_v->GetOrder());
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for (int q = 0; q < ir->GetNPoints(); ++q) {
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const mfem::IntegrationPoint& ip = ir->IntPoint(q);
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Tr.SetIntPoint(&ip);
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auto [J_inv, detJ, weight] = m_map.GetQuadratureContext(Tr, ip);
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m_phi->GetGradient(Tr, grad_phi_elem);
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mfem::DenseMatrix J_map(dim, dim), J_map_inv(dim, dim);
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m_map.ComputeJacobian(Tr, J_map);
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mfem::CalcInverse(J_map, J_map_inv);
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J_map_inv.MultTranspose(grad_phi_elem, grad_phi_phys);
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fe_v->CalcShape(ip, shape_v);
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fe_rho->CalcShape(ip, shape_rho);
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for (int i = 0; i < dof_v; ++i) {
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for (int c = 0; c < dim; ++c) {
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const int row = i + c * dof_v;
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for (int j = 0; j < dof_rho; ++j) {
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(*dv_drho)(row, j) += shape_v(i) * shape_rho(j) * grad_phi_phys(c) * weight;
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}
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}
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}
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}
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}
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} |