int main ()
{
int i = 0;
int n_points = 1000;
double delta_t = 0.0005;
double* x_array = malloc(sizeof(double)*n_points);
double* u_old = malloc(sizeof(double)*n_points);
double* u_new = malloc(sizeof(double)*n_points);
double* u_init = malloc(sizeof(double)*n_points);
FILE *fileOut;
fileOut = fopen("fileOut.txt","w");
if (!fileOut)
{
printf("Problema creando el archivo");
exit(1);
}
if(!x_array || !u_new || !u_old || !u_init)
{
printf("Problema creando el arreglo");
exit(1);
}
// Initialization of time array and initial condition
for (i = 0; i<n_points; i++)
{
x_array[i] = (i*1.0)/(n_points-1);
u_init[i] = initialCondition(x_array[i]);
}
// Boundary condition
u_init[0]=0.0;
u_init[n_points-1] = 0.0;
u_new[0]=0.0;
u_new[n_points-1] = 0.0;
double delta_x = x_array[1]-x_array[0];
double c = 1.0;
double r = c*delta_t/delta_x;
for (i = 0; i<n_points; i++)
u_old[i] = u_init[i];
// First iteration
for (i = 1;i<n_points-1;i++)
{
u_new[i] = u_old[i] + r*r/2*(u_old[i+1]-2*u_old[i]+u_old[i-1]);
}
// Saving file
for (i = 0; i<n_points;i++)
{
fprintf(fileOut,"%f %f %f\n", x_array[i], u_init[i], u_new[i]);
}
fclose(fileOut);
}
void Advect3D::initGrid(HaloArray3D *u, ProcGrid3D *g) {
#pragma omp parallel for default(shared)
for (int kj = 0; kj < u->l.z*u->l.y; kj++) {
int k = kj / u->l.y, j = kj % u->l.y;
double z = delta.z * (k + g->L2G0(2, gridSize.z));
double y = delta.y * (j + g->L2G0(1, gridSize.y));
for (int i=0; i < u->l.x; i++) {
double x = delta.x * (i + g->L2G0(0, gridSize.x)*B);
Vh(u, i, j, k) = initialCondition(x, y, z, 0.0, V.x, V.y, V.z);
}
}
}
double Advect3D::checkError(double t, HaloArray3D *u, ProcGrid3D *g) {
double err = 0.0;
#pragma omp parallel for default(shared) reduction(+:err)
for (int kj = 0; kj < u->l.z*u->l.y; kj++) {
int k = kj / u->l.y, j = kj % u->l.y;
double z = delta.z * (k + g->L2G0(2, gridSize.z));
double y = delta.y * (j + g->L2G0(1, gridSize.y));
for (int i=0; i < u->l.x; i++) {
double x = delta.x * (i + g->L2G0(0, gridSize.x)*B);
err += std::abs(Vh(u, i, j, k) - initialCondition(x, y, z, t,
V.x, V.y, V.z));
}
}
return (err);
}
