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WIP: Add k_mu source terms #172

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WIP: Add k_mu source terms #172

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e721ac5
feat: drafted GetKSource
AstroBarker May 9, 2023
fdf02a2
format and remove unnecessary prints
AstroBarker May 9, 2023
a9410f6
remove ye plot hack
AstroBarker May 9, 2023
4e87605
add comment
AstroBarker May 9, 2023
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1 change: 0 additions & 1 deletion scripts/python/plot_snap2d.py
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Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,6 @@ def plot_dump(
coordname = "g.n.coord"
coord = data.Get(coordname, False)
z = coord[:, 3, :, nG - 1 : -1 - nG, nG - 1 : -1 - nG]
print(np.shape(z))
y = coord[:, 2, :, nG - 1 : -1 - nG, nG - 1 : -1 - nG]
x = coord[:, 1, :, nG - 1 : -1 - nG, nG - 1 : -1 - nG]

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30 changes: 29 additions & 1 deletion src/radiation/geodesics.hpp
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Expand Up @@ -39,7 +39,35 @@ KOKKOS_INLINE_FUNCTION
void GetKSource(Real &X0, Real &X1, Real &X2, Real &X3, Real &Kcov0, Real &Kcov1,
Real &Kcov2, Real &Kcov3, Real &Kcon0,
const Geometry::CoordSysMeshBlock &geom, Real source[4]) {
SPACETIMELOOP(mu) { source[mu] = 0.; }
Real Kcov[NDFULL] = {Kcov0, Kcov1, Kcov2, Kcov3};
Real Xm[NDFULL], Xp[NDFULL];
Real Gconm[NDFULL][NDFULL], Gconp[NDFULL][NDFULL];
Real dG;

constexpr Real DELTA = 1.0e-6;

// TODO(BLB) extend later to exploit spacetime symmetries. Template on geometry?
SPACETIMELOOP(mu) {
source[mu] = 0.;
Xp[0] = X0;
Xp[1] = X1;
Xp[2] = X2;
Xp[3] = X3;
SPACETIMELOOP(nu) { Xm[nu] = Xp[nu]; }

Xm[mu] -= DELTA;
Xp[mu] += DELTA;

geom.SpacetimeMetricInverse(Xm[0], Xm[1], Xm[2], Xm[3], Gconm);
geom.SpacetimeMetricInverse(Xp[0], Xp[1], Xp[2], Xp[3], Gconp);

SPACETIMELOOP2(nu, kap) {
dG = (Gconp[nu][kap] - Gconm[nu][kap]) / (Xp[mu] - Xm[mu]);
source[mu] += Kcov[nu] * Kcov[kap] * dG;
}

source[mu] *= -1.0 / (2.0 * Kcon0);
}
}

KOKKOS_INLINE_FUNCTION
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