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implement a second hotspot for subchandra #2544

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merged 2 commits into from
Sep 9, 2023
Merged

implement a second hotspot for subchandra #2544

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5f4dce9
implement a second hotspot for subchandra
zingale Aug 30, 2023
d5a9201
Merge branch 'development' into subch_3d
zingale Sep 8, 2023
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10 changes: 10 additions & 0 deletions Exec/science/subchandra/_prob_params
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Original file line number Diff line number Diff line change
Expand Up @@ -18,3 +18,13 @@ mu_p real -5.0_rt y
mu_n real -11.0_rt y

ihe4 integer -1

# second perturbation angle -- if it is negative, then it is disabled
# this is only relevant in 3D
second_pert_angle real -1 y

second_R_pert real 1.e7_rt y

second_pert_temp_factor real 10.0_rt y

second_pert_rad_factor real 2.0_rt y
32 changes: 31 additions & 1 deletion Exec/science/subchandra/problem_initialize_state_data.H
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Expand Up @@ -70,7 +70,7 @@ void problem_initialize_state_data (int i, int j, int k,
state(i,j,k,UMY) = 0.0_rt;
state(i,j,k,UMZ) = 0.0_rt;

// add a perturbation
// add a perturbation at the north pole

Real t0 = state(i,j,k,UTEMP);

Expand All @@ -96,6 +96,36 @@ void problem_initialize_state_data (int i, int j, int k,
(0.150e0_rt * (1.0_rt + std::tanh(2.0_rt - r1))));


#if AMREX_SPACEDIM == 3
// optional second perturbation

if (problem::second_pert_angle > 0) {

Real angle_rad = problem::second_pert_angle * M_PI / 180.0_rt;

Real second_pert_center = problem::second_R_pert + problem::R_He_base;

// these are measured with respect to the center

Real x_pert = second_pert_center * std::sin(angle_rad);
Real y_pert = 0.0_rt;
Real z_pert = second_pert_center * std::cos(angle_rad);

Real dx_pert = x - x_pert;
Real dy_pert = y - y_pert;
Real dz_pert = z - z_pert;

Real r2 = std::sqrt(dx_pert * dx_pert + dy_pert * dy_pert + dz_pert * dz_pert) /
(2.5e6_rt * problem::second_pert_rad_factor);

// we are assuming here that the 2 perturbations don't overlap

state(i,j,k,UTEMP) = t0 * (1.0_rt + X_he * problem::second_pert_temp_factor *
(0.150e0_rt * (1.0_rt + std::tanh(2.0_rt - r2))));

}
#endif

burn_state.rho = state(i,j,k,URHO);
burn_state.T = state(i,j,k,UTEMP);
// we don't need to refill xn, since it still holds unchanged from above
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