int main()
{
init();
double *fluxl = calculate_flux(ul,vl,rhol);
double *fluxr = calculate_flux(ur,vr,rhor);
riemann_roe_isothermal(fluxl, fluxr);
free(fluxl);
free (fluxr);
return 0;
}
void main() {
long i, j, index, index_left, index_back, t;
double div_flux;
initialize(phi, mu, V);
boundary( phi, mu, V);
write2file(phi, mu, V, 0);
for (t=0; t < ntimesteps; t++) {
if (t%5==0) {
printf("Iteration=%ld\n", t);
}
Gauss_siedel(phi, mu, V);
//Finding the update in phi
laplacian(phi, lap_phi);
for (i=0; i < (MESHX); i++) {
for (j=0; j < (MESHY); j++) {
index = i*MESHY + j;
deltaphi[index] = (deltat/(tau*epsilon))
*(2.0*(gamma*epsilon)*lap_phi[index]
- 18.0*(gamma/epsilon)*(phi[index]*(1.0-phi[index])*(1.0-2.0*phi[index]))
+ (mu[index]-mu_eq)*6.0*(phi[index]*(1.0-phi[index])));
}
}
//Ending update of phi
//Finding update in mu
calculate_Ddcdmu(phi, mu, Ddcdmu);
calculate_flux(phi, mu, V, grad_flux, Ddcdmu);
for (i=1; i < (MESHX-1); i++) {
for (j=1; j < (MESHY-1); j++) {
index = i*MESHY + j;
index_left = index - 1;
index_back = index - MESHY;
div_flux = (grad_flux[index][Y] - grad_flux[index_left][Y])*inv_deltay2;
div_flux += (grad_flux[index][X] - grad_flux[index_back][X])*inv_deltax2;
deltamu[index] = (deltat*div_flux -
dc_dphi(phi[index], mu[index])*(deltaphi[index]))/dc_dmu(phi[index],mu[index]);
}
}
//update in mu
update(phi, mu);
if(t%saveT==0) {
write2file(phi, mu, V, t);
}
}
}
void sweep( double state[3][N][M][2], double rho[N][M][2], double u[N][M][2], double v[N][M][2], double tstep, double xspacing, double cs, int N, int M, int offsetleft[2], int offsetright[2])
// ONE TIMESTEP
{
for(int i=0;i<N;i++)
{
for (int j=0;j<M;j++)
{
for (int k=0; k<3; k++)
{
state[k][i][j][1]=0;
}
rho[i][j][1] = 0;
u[i][j][1] = 0;
v[i][j][1] = 0;
}
}
for(int i=0;i<N;i++)
{
for (int j=0;j<M;j++)
{
int left[2];
int right[2];
int cell[2];
cell[0] = i;
cell[1] = j;
for (int jj = 0; jj<2; jj++) {left[jj] = cell[jj] + offsetleft[jj]; right[jj] = cell[jj] + offsetright[jj];}
// BOUNDARY CONDITIONS
if (left[0] == -1) left[0] = N-1;
if (right[0] == N) right[0] = 0;
if (left[1] == -1) left[1] = M-1;
if (right[1] == M) right[1] = 0;
double uleft = u[left[0]][left[1]][0];
double uright = u[right[0]][right[1]][0];
double vleft = v[left[0]][left[1]][0];
double vright = v[right[0]][right[1]][0];
double rholeft = rho[left[0]][left[1]][0];
double rhoright = rho[right[0]][right[1]][0];
double *fluxl = calculate_flux(uleft,vleft,rholeft);
double *fluxr = calculate_flux(u[i][j][0],v[i][j][0],rho[i][j][0]);
double *fluxL = riemann_roe_isothermal(fluxl,fluxr,rholeft,uleft,vleft,rho[i][j][0],u[i][j][0],v[i][j][0]);
double *fluxl2 = calculate_flux(u[i][j][0],v[i][j][0],rho[i][j][0]);
double *fluxr2 = calculate_flux(uright,vright,rhoright);
double *fluxR = riemann_roe_isothermal(fluxl2,fluxr2,rho[i][j][0],u[i][j][0],v[i][j][0],rhoright,uright,vright);
for (int k=0; k<3; k++)
{
state[k][i][j][1] = state[k][i][j][0] + (tstep/xspacing)*(fluxL[k]-fluxR[k]);
}
rho[i][j][1] = state[0][i][j][1];
u[i][j][1] = state[1][i][j][1]/rho[i][j][1];
v[i][j][1] = state[2][i][j][1]/rho[i][j][1];
}
}
for(int i=0;i<N;i++)
{
for(int j=0; j<M;j++)
{
printf("%f ", rho[i][j][1]);
}
printf("\n");
}
}