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#include <WarpX.H>
#include <WarpXConst.H>
using namespace amrex;
void
WarpX::MoveWindow (bool move_j)
{
if (do_moving_window == 0) return;
// Update the continuous position of the moving window,
// and of the plasma injection
moving_window_x += moving_window_v * dt[0];
int dir = moving_window_dir;
// Continuously inject plasma in new cells (by default only on level 0)
if (WarpX::do_plasma_injection and (WarpX::gamma_boost > 1)){
// In boosted-frame simulations, the plasma has moved since the last
// call to this function, and injection position needs to be updated
current_injection_position -= WarpX::beta_boost *
WarpX::boost_direction[dir] * PhysConst::c * dt[0];
}
// compute the number of cells to shift on the base level
Real new_lo[BL_SPACEDIM];
Real new_hi[BL_SPACEDIM];
const Real* current_lo = geom[0].ProbLo();
const Real* current_hi = geom[0].ProbHi();
const Real* dx = geom[0].CellSize();
int num_shift_base = static_cast<int>((moving_window_x - current_lo[dir]) / dx[dir]);
if (num_shift_base == 0) return;
// update the problem domain. Note the we only do this on the base level because
// amrex::Geometry objects share the same, static RealBox.
for (int i=0; i<BL_SPACEDIM; i++) {
new_lo[i] = current_lo[i];
new_hi[i] = current_hi[i];
}
new_lo[dir] = current_lo[dir] + num_shift_base * dx[dir];
new_hi[dir] = current_hi[dir] + num_shift_base * dx[dir];
RealBox new_box(new_lo, new_hi);
geom[0].ProbDomain(new_box);
int num_shift = num_shift_base;
int num_shift_crse = num_shift;
// Shift the mesh fields
for (int lev = 0; lev <= max_level; ++lev) {
if (lev > 0) {
num_shift_crse = num_shift;
num_shift *= refRatio(lev-1)[dir];
}
for (int dim = 0; dim < 3; ++dim) {
shiftMF(*Bfield_fp[lev][dim], geom[lev], num_shift, dir);
shiftMF(*Efield_fp[lev][dim], geom[lev], num_shift, dir);
if (move_j) {
shiftMF(*current_fp[lev][dim], geom[lev], num_shift, dir);
}
if (do_dive_cleaning) {
shiftMF(*F_fp[lev], geom[lev], num_shift, dir);
shiftMF(*rho_fp[lev], geom[lev], num_shift, dir);
}
if (do_pml && pml[lev]->ok()) {
const std::array<MultiFab*, 3>& pml_B = pml[lev]->GetB_fp();
const std::array<MultiFab*, 3>& pml_E = pml[lev]->GetE_fp();
shiftMF(*pml_B[dim], geom[lev], num_shift, dir);
shiftMF(*pml_E[dim], geom[lev], num_shift, dir);
if (do_dive_cleaning) {
MultiFab* pml_F = pml[lev]->GetF_fp();
shiftMF(*pml_F, geom[lev], num_shift, dir);
}
}
if (lev > 0) {
shiftMF(*Bfield_cp[lev][dim], geom[lev-1], num_shift_crse, dir);
shiftMF(*Efield_cp[lev][dim], geom[lev-1], num_shift_crse, dir);
shiftMF(*Bfield_aux[lev][dim], geom[lev], num_shift, dir);
shiftMF(*Efield_aux[lev][dim], geom[lev], num_shift, dir);
if (move_j) {
shiftMF(*current_cp[lev][dim], geom[lev-1], num_shift_crse, dir);
}
if (do_dive_cleaning) {
shiftMF(*F_cp[lev], geom[lev-1], num_shift_crse, dir);
shiftMF(*rho_cp[lev], geom[lev-1], num_shift_crse, dir);
}
if (do_pml && pml[lev]->ok()) {
const std::array<MultiFab*, 3>& pml_B = pml[lev]->GetB_cp();
const std::array<MultiFab*, 3>& pml_E = pml[lev]->GetE_cp();
shiftMF(*pml_B[dim], geom[lev-1], num_shift_crse, dir);
shiftMF(*pml_E[dim], geom[lev-1], num_shift_crse, dir);
if (do_dive_cleaning) {
MultiFab* pml_F = pml[lev]->GetF_cp();
shiftMF(*pml_F, geom[lev-1], num_shift_crse, dir);
}
}
}
}
}
// Continuously inject plasma in new cells (by default only on level 0)
if (WarpX::do_plasma_injection) {
const int lev = 0;
// particleBox encloses the cells where we generate particles
// (only injects particles in an integer number of cells,
// for correct particle spacing)
RealBox particleBox = geom[lev].ProbDomain();
Real new_injection_position;
if (moving_window_v >= 0){
// Forward-moving window
Real dx = geom[lev].CellSize(dir);
new_injection_position = current_injection_position +
std::floor( (geom[lev].ProbHi(dir) - current_injection_position)/dx ) * dx;
} else {
// Backward-moving window
Real dx = geom[lev].CellSize(dir);
new_injection_position = current_injection_position -
std::floor( (current_injection_position - geom[lev].ProbLo(dir))/dx) * dx;
}
// Modify the corresponding bounds of the particleBox
if (moving_window_v >= 0) {
particleBox.setLo( dir, current_injection_position );
particleBox.setHi( dir, new_injection_position );
} else {
particleBox.setLo( dir, new_injection_position );
particleBox.setHi( dir, current_injection_position );
}
// Perform the injection of new particles in particleBox
if (particleBox.ok() and (current_injection_position != new_injection_position)){
for (int i = 0; i < num_injected_species; ++i) {
int ispecies = injected_plasma_species[i];
WarpXParticleContainer& pc = mypc->GetParticleContainer(ispecies);
auto& ppc = dynamic_cast<PhysicalParticleContainer&>(pc);
ppc.AddPlasma(lev, particleBox);
}
// Update the injection position
current_injection_position = new_injection_position;
}
}
}
void
WarpX::shiftMF(MultiFab& mf, const Geometry& geom, int num_shift, int dir)
{
const BoxArray& ba = mf.boxArray();
const DistributionMapping& dm = mf.DistributionMap();
const int nc = mf.nComp();
const int ng = mf.nGrow();
BL_ASSERT(ng >= num_shift);
MultiFab tmpmf(ba, dm, nc, ng);
MultiFab::Copy(tmpmf, mf, 0, 0, nc, ng);
tmpmf.FillBoundary(geom.periodicity());
// Make a box that covers the region that the window moved into
const IndexType& typ = ba.ixType();
const Box& domainBox = geom.Domain();
Box adjBox;
if (num_shift > 0) {
adjBox = adjCellHi(domainBox, dir, ng);
} else {
adjBox = adjCellLo(domainBox, dir, ng);
}
adjBox = amrex::convert(adjBox, typ);
for (int idim = 0; idim < BL_SPACEDIM; ++idim) {
if (idim == dir and typ.nodeCentered(dir)) {
if (num_shift > 0) {
adjBox.growLo(idim, -1);
} else {
adjBox.growHi(idim, -1);
}
} else if (idim != dir) {
adjBox.growLo(idim, ng);
adjBox.growHi(idim, ng);
}
}
#ifdef _OPENMP
#pragma omp parallel
#endif
for (MFIter mfi(tmpmf); mfi.isValid(); ++mfi )
{
FArrayBox& srcfab = tmpmf[mfi];
Box outbox = mfi.fabbox();
outbox &= adjBox;
if (outbox.ok()) { // outbox is the region that the window moved into
srcfab.setVal(0.0, outbox, 0, nc);
}
FArrayBox& dstfab = mf[mfi];
dstfab.setVal(0.0);
Box dstBox = dstfab.box();
if (num_shift > 0) {
dstBox.growHi(dir, -num_shift);
} else {
dstBox.growLo(dir, num_shift);
}
dstfab.copy(srcfab, amrex::shift(dstBox,dir,num_shift), 0, dstBox, 0, nc);
}
}
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