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Seemingly reasonable sink for both density and velocity.

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This commit is contained in:
Miikka Vaisala
2019-08-16 13:29:34 +08:00
parent f921840505
commit 1bfb0390ad
2 changed files with 40 additions and 4 deletions
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40
acc/mhd_solver/stencil_process.sps
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@@ -115,8 +115,8 @@ sink_accretion(int3 globalVertexIdx, in ScalarField lnrho, Scalar dt){
weight = Scalar(0.0);
}
const Scalar sink_mass = DCONST_REAL(AC_M_sink);
const Scalar lnrho_min = Scalar(-10.0); //TODO Define from astaroth.conf
// const Scalar sink_mass = DCONST_REAL(AC_M_sink);
// const Scalar rate = truelove_density(lnrho);
// const Scalar B = Scalar(0.5);
// const Scalar k = Scalar(1.5);
@@ -125,11 +125,43 @@ sink_accretion(int3 globalVertexIdx, in ScalarField lnrho, Scalar dt){
if (value(lnrho) > lnrho_min) {
rate = exp(value(lnrho)) / dt;
} else {
rate = exp(lnrho_min) / dt;
// rate = exp(lnrho_min) / dt;
rate = Scalar(0.0);
}
accretion_density = weight * rate ;
return accretion_density;
}
Vector
sink_accretion_velocity(int3 globalVertexIdx, in VectorField uu, Scalar dt) {
const Vector grid_pos = (Vector){(globalVertexIdx.x - nx_min) * dsx,
(globalVertexIdx.y - ny_min) * dsy,
(globalVertexIdx.z - nz_min) * dsz};
const Vector sink_pos = (Vector){DCONST_REAL(AC_sink_pos_x),
DCONST_REAL(AC_sink_pos_y),
DCONST_REAL(AC_sink_pos_z)};
const Scalar profile_range = DCONST_REAL(AC_accretion_range);
const Scalar accretion_distance = length(grid_pos - sink_pos);
Vector accretion_velocity;
Scalar weight;
// Step function weighting
if ((accretion_distance) <= profile_range){
weight = Scalar(1.0);
} else {
weight = Scalar(0.0);
}
Vector rate;
if (length(value(uu)) > Scalar(0.0)) {
rate = (Scalar(1.0)/dt) * value(uu);
} else {
rate = (Vector){0.0, 0.0, 0.0};
}
accretion_velocity = weight * rate ;
return accretion_velocity;
}
#endif
@@ -174,8 +206,8 @@ momentum(int3 globalVertexIdx, in VectorField uu, in ScalarField lnrho, in Scala
//Gravity term
+ sink_gravity(globalVertexIdx)
//Corresponding loss of momentum
- (Scalar(1.0) / Scalar( (dsx*dsy*dsz) * exp(value(lnrho)))) // Correction factor by unit mass
* (sink_accretion(globalVertexIdx, lnrho, dt) * value(uu)) // As in Lee et al.(2014)
- //(Scalar(1.0) / Scalar( (dsx*dsy*dsz) * exp(value(lnrho)))) * // Correction factor by unit mass
sink_accretion_velocity(globalVertexIdx, uu, dt) // As in Lee et al.(2014)
;
#else
;

4
config/templates/sinktest.conf
View File

@@ -57,6 +57,10 @@ AC_sink_pos_z = 3.14
AC_M_sink_Msun = 1e-6
AC_soft = 0.36
// Accretion Parameters
// profile_range shoul be close to a multiple of dsx. E.g. 4*dsx
AC_accretion_range = 0.2
// Physical properties of the domain
AC_unit_velocity = 1e5
// using density estimate of 100 H2 molecules per cm^3