38 lines
1.2 KiB
C++
38 lines
1.2 KiB
C++
module;
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#include "mean_field.h"
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module mean_field;
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namespace mean_field::physics {
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double compute_moment_of_inertia(const fem::FEM &fem, const mfem::GridFunction &rho_ref) {
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double local_I = 0.0;
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for (int i = 0; i < fem.mesh->GetNE(); i++) {
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if (fem.mesh->GetAttribute(i) == 3) continue;
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mfem::ElementTransformation *T = fem.mesh->GetElementTransformation(i);
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const mfem::IntegrationRule &ir = *fem.int_rule;
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for (int j = 0; j < ir.GetNPoints(); j++) {
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const mfem::IntegrationPoint &ip = ir.IntPoint(j);
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T->SetIntPoint(&ip);
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const double rho_hat = rho_ref.GetValue(i, ip);
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mfem::Vector x_phys;
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fem.mapping->GetPhysicalPoint(*T, ip, x_phys);
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const double r_cyl_sq = x_phys(0) * x_phys(0) + x_phys(1) * x_phys(1);
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const double detJ = std::fabs(fem.mapping->ComputeDetJ(*T, ip));
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const double weight = T->Weight() * ip.weight * detJ;
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local_I += rho_hat * r_cyl_sq * weight;
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}
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}
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double global_I = 0.0;
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MPI_Allreduce(&local_I, &global_I, 1, MPI_DOUBLE, MPI_SUM, fem.H1_fes->GetComm());
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return global_I;
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}
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} |