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WIP: Low density regions #23

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WIP: Low density regions #23

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a23cf8e
Try different handling of low density
bendudson Mar 26, 2023
d929383
Allow numerical momentum flux through boundary
bendudson Mar 26, 2023
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10 changes: 8 additions & 2 deletions sd1d.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -382,6 +382,8 @@ class SD1D : public PhysicsModel {

mesh->communicate(Ne, NVi, P);

Field3D P_solver = P; // Save the pressure in the solver

// Floor small values
P = floor(P, 1e-10);
Ne = floor(Ne, 1e-10);
Expand All @@ -390,7 +392,7 @@ class SD1D : public PhysicsModel {

Vi = NVi / Ne;

Field3D Te = 0.5 * P / Ne; // Assuming Te = Ti
Field3D Te = 0.5 * P / Nelim; // Assuming Te = Ti

for (auto &i : Te.getRegion("RGN_NOBNDRY")) {
if (Te[i] > 10.)
Expand Down Expand Up @@ -1157,7 +1159,7 @@ class SD1D : public PhysicsModel {
if (rhs_explicit) {
// Flux splitting with upwinding
Field3D a = sqrt(gamma_sound * 2. * Te); // Local sound speed
ddt(NVi) = -FV::Div_par(NVi, Vi, a, bndry_flux_fix) // Momentum flow
ddt(NVi) = -FV::Div_par(NVi, Vi, a, false) // Momentum flow
- Grad_par(P);

if (atomic) {
Expand Down Expand Up @@ -1271,6 +1273,10 @@ class SD1D : public PhysicsModel {
if (ADpar > 0.0) {
ddt(P) += ADpar * AddedDissipation(1.0, P, P, true);
}

// Force P towards value in solver.
// Note: This only impacts solutions where Ne < floor
ddt(P) += 2. * Te * Ne - P_solver;
}
}

Expand Down