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calc_dt_kernel_c.c
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calc_dt_kernel_c.c
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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/. */
/**
* @brief C timestep kernel
* @author Wayne Gaudin
* @details calculates the minimum timestep on the mesh chunk based on the CFL
* condition, the velocity gradient and the velocity divergence. A safety
* factor is used to ensure numerical stability.
*/
#include <stdio.h>
#include <stdlib.h>
#include "ftocmacros.h"
#include <math.h>
void calc_dt_kernel_c_(int *xmin,int *xmax,int *ymin,int *ymax,
double *gsmall,double *gbig,double *mindt,
double *dtcsafe,
double *dtusafe,
double *dtvsafe,
double *dtdivsafe,
double *xarea,
double *yarea,
double *cellx,
double *celly,
double *celldx,
double *celldy,
double *volume,
double *density0,
double *energy0,
double *pressure,
double *viscosity,
double *soundspeed,
double *xvel0,
double *yvel0,
double *dt_min,
double *dtminval,
int *dtlcontrol,
double *xlpos,
double *ylpos,
int *jldt,
int *kldt,
int *smll)
{
int x_min=*xmin;
int x_max=*xmax;
int y_min=*ymin;
int y_max=*ymax;
double g_small=*gsmall;
double g_big=*gbig;
double dt_min_val=*dtminval;
double dtc_safe=*dtcsafe;
double dtu_safe=*dtusafe;
double dtv_safe=*dtvsafe;
double dtdiv_safe=*dtdivsafe;
double min_dt=*mindt;
int dtl_control=*dtlcontrol;
double xl_pos=*xlpos;
double yl_pos=*ylpos;
int j_ldt=*jldt;
int k_ldt=*kldt;
int small=*smll;
int j,k;
double div,dsx,dsy,dtut,dtvt,dtct,dtdivt,cc,dv1,dv2,jk_control;
small=0;
dt_min_val = g_big;
jk_control=1.1;
for (k=y_min;k<=y_max;k++) {
#pragma ivdep
for (j=x_min;j<=x_max;j++) {
dsx=celldx[FTNREF1D(j,x_min-2)];
dsy=celldy[FTNREF1D(k,y_min-2)];
cc=soundspeed[FTNREF2D(j,k,x_max+4,x_min-2,y_min-2)]*soundspeed[FTNREF2D(j,k,x_max+4,x_min-2,y_min-2)];
cc=cc+2.0*viscosity[FTNREF2D(j,k,x_max+4,x_min-2,y_min-2)]/density0[FTNREF2D(j,k,x_max+4,x_min-2,y_min-2)];
cc=MAX(sqrt(cc),g_small);
dtct=dtc_safe*MIN(dsx,dsy)/cc;
div=0.0;
dv1=(xvel0[FTNREF2D(j ,k ,x_max+5,x_min-2,y_min-2)]+xvel0[FTNREF2D(j ,k+1,x_max+5,x_min-2,y_min-2)])*xarea[FTNREF2D(j ,k ,x_max+5,x_min-2,y_min-2)];
dv2=(xvel0[FTNREF2D(j+1,k ,x_max+5,x_min-2,y_min-2)]+xvel0[FTNREF2D(j+1,k+1,x_max+5,x_min-2,y_min-2)])*xarea[FTNREF2D(j+1,k ,x_max+5,x_min-2,y_min-2)];
div=div+dv2-dv1;
dtut=dtu_safe*2.0*volume[FTNREF2D(j,k,x_max+4,x_min-2,y_min-2)]/MAX(fabs(dv1),MAX(fabs(dv2),g_small*volume[FTNREF2D(j,k,x_max+4,x_min-2,y_min-2)]));
dv1=(yvel0[FTNREF2D(j,k,x_max+5,x_min-2,y_min-2)]+yvel0[FTNREF2D(j+1,k,x_max+5,x_min-2,y_min-2)])*yarea[FTNREF2D(j,k,x_max+4,x_min-2,y_min-2)];
dv2=(yvel0[FTNREF2D(j,k+1,x_max+5,x_min-2,y_min-2)]+yvel0[FTNREF2D(j+1,k+1,x_max+5,x_min-2,y_min-2)])*yarea[FTNREF2D(j,k+1,x_max+4,x_min-2,y_min-2)];
div=div+dv2-dv1;
dtvt=dtv_safe*2.0*volume[FTNREF2D(j,k,x_max+4,x_min-2,y_min-2)]/MAX(fabs(dv1),MAX(fabs(dv2),g_small*volume[FTNREF2D(j,k,x_max+4,x_min-2,y_min-2)]));
div=div/(2.0*volume[FTNREF2D(j,k,x_max+4,x_min-2,y_min-2)]);
if(div < -g_small) {
dtdivt=dtdiv_safe*(-1.0/div);
}
else {
dtdivt=g_big;
}
dt_min[FTNREF2D(j,k,x_max+5,x_min-2,y_min-2)]=MIN(dtct,MIN(dtut,MIN(dtvt,dtdivt)));
}
}
for (k=y_min;k<=y_max;k++) {
#pragma ivdep
for (j=x_min;j<=x_max;j++) {
if(dt_min[FTNREF2D(j,k,x_max+5,x_min-2,y_min-2)] < dt_min_val) dt_min_val=dt_min[FTNREF2D(j,k,x_max+5,x_min-2,y_min-2)];
}
}
// Extract the mimimum timestep information
dtl_control=10.01*(jk_control-(int)(jk_control));
jk_control=jk_control-(jk_control-(int)(jk_control));
j_ldt=1; //MOD(INT(jk_control),x_max)
k_ldt=1; //1+(jk_control/x_max)
//xl_pos=cellx[FTNREF1D(j_ldt,xmin-2)];
//yl_pos=celly[FTNREF1D(j_ldt,ymin-2)];
if(dt_min_val < min_dt) small=1;
*dtminval=dt_min_val;
*dtlcontrol=1;
*xlpos=xl_pos;
*ylpos=yl_pos;
*jldt=j_ldt;
*kldt=k_ldt;
if(small != 0) {
printf("Timestep information:\n");
printf("j, k :%i %i \n",j_ldt,k_ldt);
printf("x, y :%f %f \n",xl_pos,yl_pos);
printf("timestep : %f\n",dt_min_val);
printf("Cell velocities;\n");
printf("%f %f \n",xvel0[FTNREF2D(j_ldt ,k_ldt ,x_max+5,x_min-2,y_min-2)],yvel0[FTNREF2D(j_ldt ,k_ldt ,x_max+5,x_min-2,y_min-2)]);
printf("%f %f \n",xvel0[FTNREF2D(j_ldt+1,k_ldt ,x_max+5,x_min-2,y_min-2)],yvel0[FTNREF2D(j_ldt+1,k_ldt ,x_max+5,x_min-2,y_min-2)]);
printf("%f %f \n",xvel0[FTNREF2D(j_ldt+1,k_ldt+1,x_max+5,x_min-2,y_min-2)],yvel0[FTNREF2D(j_ldt+1,k_ldt+1,x_max+5,x_min-2,y_min-2)]);
printf("%f %f \n",xvel0[FTNREF2D(j_ldt ,k_ldt+1,x_max+5,x_min-2,y_min-2)],yvel0[FTNREF2D(j_ldt ,k_ldt+1,x_max+5,x_min-2,y_min-2)]);
printf("density, energy, pressure, soundspeed \n");
printf("%f %f %f %f \n",density0[FTNREF2D(j_ldt,k_ldt,x_max+4,x_min-2,y_min-2)],energy0[FTNREF2D(j_ldt,k_ldt,x_max+4,x_min-2,y_min-2)],pressure[FTNREF2D(j_ldt,k_ldt,x_max+4,x_min-2,y_min-2)],soundspeed[FTNREF2D(j_ldt,k_ldt,x_max+4,x_min-2,y_min-2)]);
}
}