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| // test solenoidal reconstruction of face velocity field
// i.e. refine_face_solenoidal()
#include "poisson.h"
#include "utils.h"
double divmax (face vector uf)
{
double dmax = 0.;
foreach() {
double d = 0.;
foreach_dimension()
d += uf.x[1] - uf.x[];
// fprintf (stderr, "%g %g %g %.6f\n", x, y, z, d);
if (fabs(d) > dmax)
dmax = fabs(d);
}
return dmax;
}
int main()
{
size (1.[0]);
init_grid(8);
origin (-0.5,-0.5,-0.5);
foreach_dimension()
periodic (right);
face vector uf[];
#if dimension == 2
// Taylor-Green vortices
foreach_face(x)
uf.x[] = - cos(2.*pi*x)*sin(2.*pi*y);
foreach_face(y)
uf.y[] = sin(2.*pi*x)*cos(2.*pi*y);
#else // dimension == 3
// random flow
foreach_face()
uf.x[] = 1. - 2.*rand()/(double)RAND_MAX;
#endif
#if 1
TOLERANCE = 1e-10;
scalar p[];
foreach()
p[] = 0.;
project (uf, p);
#endif
fprintf (stderr, "div max before: %.9f\n", divmax(uf));
uf.x.refine = refine_face_solenoidal;
refine (x*x + y*y + z*z < sq(0.25) && level < 4);
#if 0
output_gfs (stdout);
foreach_face(x)
fprintf (stderr, "%g %g %g %g 0\n", x, y, z, uf.x[]);
#endif
fprintf (stderr, "div max after: %.9f\n", divmax(uf));
}
|
