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advec_mom.cpp
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advec_mom.cpp
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/*
Crown Copyright 2012 AWE.
This file is part of CloverLeaf.
CloverLeaf is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your option)
any later version.
CloverLeaf is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
You should have received a copy of the GNU General Public License along with
CloverLeaf. If not, see http://www.gnu.org/licenses/.
*/
#include "advec_mom.h"
// @brief Fortran momentum advection kernel
// @author Wayne Gaudin
// @details Performs a second order advective remap on the vertex momentum
// using van-Leer limiting and directional splitting.
// Note that although pre_vol is only set and not used in the update, please
// leave it in the method.
void advec_mom_kernel(
int x_min, int x_max, int y_min, int y_max,
Kokkos::View<double**>& vel1,
Kokkos::View<double**>& mass_flux_x,
Kokkos::View<double**>& vol_flux_x,
Kokkos::View<double**>& mass_flux_y,
Kokkos::View<double**>& vol_flux_y,
Kokkos::View<double**>& volume,
Kokkos::View<double**>& density1,
Kokkos::View<double**>& node_flux,
Kokkos::View<double**>& node_mass_post,
Kokkos::View<double**>& node_mass_pre,
Kokkos::View<double**>& mom_flux,
Kokkos::View<double**>& pre_vol,
Kokkos::View<double**>& post_vol,
Kokkos::View<double*>& celldx,
Kokkos::View<double*>& celldy,
int which_vel,
int sweep_number,
int direction) {
int mom_sweep=direction+2*(sweep_number-1);
// DO k=y_min-2,y_max+2
// DO j=x_min-2,x_max+2
Kokkos::MDRangePolicy<Kokkos::Rank<2>> policy({x_min-2+1, y_min-2+1}, {x_max+2+2, y_max+2+2});
if (mom_sweep == 1) { // x 1
Kokkos::parallel_for("advec_mom x1", policy, KOKKOS_LAMBDA(const int j, const int k) {
post_vol(j,k)= volume(j,k)+vol_flux_y(j ,k+1)-vol_flux_y(j,k);
pre_vol(j,k)=post_vol(j,k)+vol_flux_x(j+1,k )-vol_flux_x(j,k);
});
}
else if (mom_sweep == 2) { // y 1
Kokkos::parallel_for("advec_mom y1", policy, KOKKOS_LAMBDA(const int j, const int k) {
post_vol(j,k)= volume(j,k)+vol_flux_x(j+1,k )-vol_flux_x(j,k);
pre_vol(j,k)=post_vol(j,k)+vol_flux_y(j ,k+1)-vol_flux_y(j,k);
});
}
else if (mom_sweep == 3) { // x 2
Kokkos::parallel_for("advec_mom x1", policy, KOKKOS_LAMBDA(const int j, const int k) {
post_vol(j,k)=volume(j,k);
pre_vol(j,k)=post_vol(j,k)+vol_flux_y(j ,k+1)-vol_flux_y(j,k);
});
}
else if (mom_sweep == 4) { // y 2
Kokkos::parallel_for("advec_mom y1", policy, KOKKOS_LAMBDA(const int j, const int k) {
post_vol(j,k)=volume(j,k);
pre_vol(j,k)=post_vol(j,k)+vol_flux_x(j+1,k )-vol_flux_x(j,k);
});
}
if (direction == 1) {
if (which_vel == 1) {
// DO k=y_min,y_max+1
// DO j=x_min-2,x_max+2
Kokkos::parallel_for("advec_mom dir1, vel1, node_flux",
Kokkos::MDRangePolicy<Kokkos::Rank<2>>({x_min-2+1, y_min+1}, {x_max+2+2, y_max+1+2}),
KOKKOS_LAMBDA (const int j, const int k) {
// Find staggered mesh mass fluxes, nodal masses and volumes.
node_flux(j,k)=0.25*(mass_flux_x(j,k-1 )+mass_flux_x(j ,k)
+mass_flux_x(j+1,k-1)+mass_flux_x(j+1,k));
});
// DO k=y_min,y_max+1
// DO j=x_min-1,x_max+2
Kokkos::parallel_for("advec_mom dir1, vel1, node_mass_pre",
Kokkos::MDRangePolicy<Kokkos::Rank<2>>({x_min-1+1, y_min+1}, {x_max+2+2, y_max+1+2}),
KOKKOS_LAMBDA (const int j, const int k) {
// Staggered cell mass post advection
node_mass_post(j,k)=0.25*(density1(j ,k-1)*post_vol(j ,k-1)
+density1(j ,k )*post_vol(j ,k )
+density1(j-1,k-1)*post_vol(j-1,k-1)
+density1(j-1,k )*post_vol(j-1,k ));
node_mass_pre(j,k)=node_mass_post(j,k)-node_flux(j-1,k)+node_flux(j,k);
});
}
// DO k=y_min,y_max+1
// DO j=x_min-1,x_max+1
Kokkos::parallel_for("advec_mom dir1, mom_flux",
Kokkos::MDRangePolicy<Kokkos::Rank<2>>({x_min-1+1, y_min+1}, {x_max+1+2, y_max+1+2}),
KOKKOS_LAMBDA (const int j, const int k) {
int upwind, donor, downwind, dif;
double sigma, width, limiter, vdiffuw, vdiffdw, auw, adw, wind, advec_vel_s;
if (node_flux(j,k) < 0.0) {
upwind=j+2;
donor=j+1;
downwind=j;
dif=donor;
}
else {
upwind=j-1;
donor=j;
downwind=j+1;
dif=upwind;
}
sigma=fabs(node_flux(j,k))/(node_mass_pre(donor,k));
width=celldx(j);
vdiffuw=vel1(donor,k)-vel1(upwind,k);
vdiffdw=vel1(downwind,k)-vel1(donor,k);
limiter=0.0;
if (vdiffuw*vdiffdw > 0.0) {
auw=fabs(vdiffuw);
adw=fabs(vdiffdw);
wind=1.0;
if (vdiffdw <= 0.0) wind=-1.0;
limiter=wind*MIN(MIN(width*((2.0-sigma)*adw/width+(1.0+sigma)*auw/celldx(dif))/6.0,auw),adw);
}
advec_vel_s=vel1(donor,k)+(1.0-sigma)*limiter;
mom_flux(j,k)=advec_vel_s*node_flux(j,k);
});
// DO k=y_min,y_max+1
// DO j=x_min,x_max+1
Kokkos::parallel_for("advec_mom dir1, vel1",
Kokkos::MDRangePolicy<Kokkos::Rank<2>>({x_min+1, y_min+1}, {x_max+1+2, y_max+1+2}),
KOKKOS_LAMBDA (const int j, const int k) {
vel1 (j,k)=(vel1 (j,k)*node_mass_pre(j,k)+mom_flux(j-1,k)-mom_flux(j,k))/node_mass_post(j,k);
});
}
else if (direction == 2) {
if (which_vel == 1) {
// DO k=y_min-2,y_max+2
// DO j=x_min,x_max+1
Kokkos::parallel_for("advec_mom dir2, vel1, node_flux",
Kokkos::MDRangePolicy<Kokkos::Rank<2>>({x_min+1, y_min-2+1}, {x_max+1+2, y_max+2+2}),
KOKKOS_LAMBDA (const int j, const int k) {
// Find staggered mesh mass fluxes and nodal masses and volumes.
node_flux(j,k)=0.25*(mass_flux_y(j-1,k )+mass_flux_y(j ,k )
+mass_flux_y(j-1,k+1)+mass_flux_y(j ,k+1));
});
// DO k=y_min-1,y_max+2
// DO j=x_min,x_max+1
Kokkos::parallel_for("advec_mom dir2, vel1, node_mass_pre",
Kokkos::MDRangePolicy<Kokkos::Rank<2>>({x_min+1, y_min-1+1}, {x_max+1+2, y_max+2+2}),
KOKKOS_LAMBDA (const int j, const int k) {
node_mass_post(j,k)=0.25*(density1(j ,k-1)*post_vol(j ,k-1)
+density1(j ,k )*post_vol(j ,k )
+density1(j-1,k-1)*post_vol(j-1,k-1)
+density1(j-1,k )*post_vol(j-1,k ));
node_mass_pre(j,k)=node_mass_post(j,k)-node_flux(j,k-1)+node_flux(j,k);
});
}
// DO k=y_min-1,y_max+1
// DO j=x_min,x_max+1
Kokkos::parallel_for("advec_mom dir2, mom_flux",
Kokkos::MDRangePolicy<Kokkos::Rank<2>>({x_min+1, y_min-1+1}, {x_max+1+2, y_max+1+2}),
KOKKOS_LAMBDA (const int j, const int k) {
int upwind, donor, downwind, dif;
double sigma, width, limiter, vdiffuw, vdiffdw, auw, adw, wind, advec_vel_s;
if (node_flux(j,k) < 0.0) {
upwind=k+2;
donor=k+1;
downwind=k;
dif=donor;
}
else {
upwind=k-1;
donor=k;
downwind=k+1;
dif=upwind;
}
sigma=fabs(node_flux(j,k))/(node_mass_pre(j,donor));
width=celldy(k);
vdiffuw=vel1(j,donor)-vel1(j,upwind);
vdiffdw=vel1(j,downwind)-vel1(j,donor);
limiter=0.0;
if (vdiffuw*vdiffdw > 0.0) {
auw=fabs(vdiffuw);
adw=fabs(vdiffdw);
wind=1.0;
if (vdiffdw <= 0.0) wind=-1.0;
limiter=wind*MIN(MIN(width*((2.0-sigma)*adw/width+(1.0+sigma)*auw/celldy(dif))/6.0,auw),adw);
}
advec_vel_s=vel1(j,donor)+(1.0-sigma)*limiter;
mom_flux(j,k)=advec_vel_s*node_flux(j,k);
});
// DO k=y_min,y_max+1
// DO j=x_min,x_max+1
Kokkos::parallel_for("advec_mom dir2, vel1",
Kokkos::MDRangePolicy<Kokkos::Rank<2>>({x_min+1, y_min+1}, {x_max+1+2, y_max+1+2}),
KOKKOS_LAMBDA (const int j, const int k) {
vel1 (j,k)=(vel1(j,k)*node_mass_pre(j,k)+mom_flux(j,k-1)-mom_flux(j,k))/node_mass_post(j,k);
});
}
}
// @brief Momentum advection driver
// @author Wayne Gaudin
// @details Invokes the user specified momentum advection kernel.
void advec_mom_driver(global_variables& globals, int tile, int which_vel, int direction, int sweep_number) {
if (which_vel == 1) {
advec_mom_kernel(
globals.chunk.tiles[tile].t_xmin,
globals.chunk.tiles[tile].t_xmax,
globals.chunk.tiles[tile].t_ymin,
globals.chunk.tiles[tile].t_ymax,
globals.chunk.tiles[tile].field.xvel1,
globals.chunk.tiles[tile].field.mass_flux_x,
globals.chunk.tiles[tile].field.vol_flux_x,
globals.chunk.tiles[tile].field.mass_flux_y,
globals.chunk.tiles[tile].field.vol_flux_y,
globals.chunk.tiles[tile].field.volume,
globals.chunk.tiles[tile].field.density1,
globals.chunk.tiles[tile].field.work_array1,
globals.chunk.tiles[tile].field.work_array2,
globals.chunk.tiles[tile].field.work_array3,
globals.chunk.tiles[tile].field.work_array4,
globals.chunk.tiles[tile].field.work_array5,
globals.chunk.tiles[tile].field.work_array6,
globals.chunk.tiles[tile].field.celldx,
globals.chunk.tiles[tile].field.celldy,
which_vel,
sweep_number,
direction);
}
else {
advec_mom_kernel(
globals.chunk.tiles[tile].t_xmin,
globals.chunk.tiles[tile].t_xmax,
globals.chunk.tiles[tile].t_ymin,
globals.chunk.tiles[tile].t_ymax,
globals.chunk.tiles[tile].field.yvel1,
globals.chunk.tiles[tile].field.mass_flux_x,
globals.chunk.tiles[tile].field.vol_flux_x,
globals.chunk.tiles[tile].field.mass_flux_y,
globals.chunk.tiles[tile].field.vol_flux_y,
globals.chunk.tiles[tile].field.volume,
globals.chunk.tiles[tile].field.density1,
globals.chunk.tiles[tile].field.work_array1,
globals.chunk.tiles[tile].field.work_array2,
globals.chunk.tiles[tile].field.work_array3,
globals.chunk.tiles[tile].field.work_array4,
globals.chunk.tiles[tile].field.work_array5,
globals.chunk.tiles[tile].field.work_array6,
globals.chunk.tiles[tile].field.celldx,
globals.chunk.tiles[tile].field.celldy,
which_vel,
sweep_number,
direction);
}
}