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#include <cmath>
#include <WarpXUtil.H>
#include <WarpXConst.H>
#include <AMReX_ParmParse.H>
using namespace amrex;
void ReadBoostedFrameParameters(Real& gamma_boost, Real& beta_boost,
Vector<int>& boost_direction)
{
ParmParse pp("warpx");
pp.query("gamma_boost", gamma_boost);
beta_boost = std::sqrt(1.-1./pow(gamma_boost,2));
if( gamma_boost > 1. ) {
std::string s;
pp.get("boost_direction", s);
if (s == "x" || s == "X") {
boost_direction[0] = 1;
}
#if (AMREX_SPACEDIM == 3)
else if (s == "y" || s == "Y") {
boost_direction[1] = 1;
}
#endif
else if (s == "z" || s == "Z") {
boost_direction[2] = 1;
}
else {
const std::string msg = "Unknown boost_dir: "+s;
Abort(msg.c_str());
}
AMREX_ALWAYS_ASSERT_WITH_MESSAGE( s == "z" || s == "Z" ,
"The boost must be in the z direction.");
}
}
void ConvertLabParamsToBoost()
{
Real gamma_boost, beta_boost;
Vector<int> boost_direction {0,0,0};
ReadBoostedFrameParameters(gamma_boost, beta_boost, boost_direction);
if (gamma_boost <= 1.) return;
Vector<Real> prob_lo(AMREX_SPACEDIM);
Vector<Real> prob_hi(AMREX_SPACEDIM);
ParmParse pp("geometry");
pp.getarr("prob_lo",prob_lo,0,AMREX_SPACEDIM);
BL_ASSERT(prob_lo.size() == AMREX_SPACEDIM);
pp.getarr("prob_hi",prob_hi,0,AMREX_SPACEDIM);
BL_ASSERT(prob_hi.size() == AMREX_SPACEDIM);
#if (AMREX_SPACEDIM == 3)
Vector<int> dim_map {0, 1, 2};
#else
Vector<int> dim_map {0, 2};
#endif
for (int idim = 0; idim < AMREX_SPACEDIM; ++idim)
{
if (boost_direction[dim_map[idim]]) {
amrex::Real convert_factor;
// Assume that the window travels with speed +c
convert_factor = 1./( gamma_boost * ( 1 - beta_boost ) );
prob_lo[idim] *= convert_factor;
prob_hi[idim] *= convert_factor;
break;
}
}
pp.addarr("prob_lo", prob_lo);
pp.addarr("prob_hi", prob_hi);
}
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