-
Notifications
You must be signed in to change notification settings - Fork 5
/
calc_dt_kernel_c.c
180 lines (147 loc) · 6.26 KB
/
calc_dt_kernel_c.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/*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 alculates 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;
#pragma omp parallel
{
#pragma omp for private(dsx,dsy,cc,dv1,dv2,div,dtct,dtut,dtvt,dtdivt,j,k)
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)));
}
}
// no 'min' in C OpenMP standard
//#pragma omp for private(j) reduction(min:dt_min_val)
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)]);
}
}