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#include <limits>
#include "cctk.h"
#include "cctk_Arguments.h"
#include "cctk_Parameters.h"
#include "carpet.hh"
namespace Carpet {
using namespace std;
void CarpetRefineTimeStep (CCTK_ARGUMENTS)
{
DECLARE_CCTK_ARGUMENTS;
DECLARE_CCTK_PARAMETERS;
// Find the smallest CFL factor for all refinement levels
CCTK_REAL min_cfl = numeric_limits<CCTK_REAL>::max();
for (int rl = 0; rl < reflevels; ++ rl) {
CCTK_REAL const level_cfl =
timereffacts.AT(rl) / maxval (spacereffacts.AT(rl));
min_cfl = min (min_cfl, level_cfl);
}
// Reduce the time step correspondingly
cctkGH->cctk_delta_time *= min_cfl;
CCTK_VInfo (CCTK_THORNSTRING,
"Timestep reduced by a factor of %g to %g",
double (1 / min_cfl),
double (cctkGH->cctk_delta_time/cctkGH->cctk_timefac));
}
} // namespace Carpet
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