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-rw-r--r--Source/Particles/Deposition/CurrentDeposition.H187
-rw-r--r--Source/Particles/WarpXParticleContainer.cpp50
-rw-r--r--Source/WarpX.cpp4
3 files changed, 222 insertions, 19 deletions
diff --git a/Source/Particles/Deposition/CurrentDeposition.H b/Source/Particles/Deposition/CurrentDeposition.H
index efda97892..20493d8c6 100644
--- a/Source/Particles/Deposition/CurrentDeposition.H
+++ b/Source/Particles/Deposition/CurrentDeposition.H
@@ -176,4 +176,191 @@ void doDepositionShapeN(const Real * const xp, const Real * const yp, const Real
);
}
+// Compute shape factor and return index of leftmost cell where
+// particle writes.
+// Specialized templates are defined below for orders 1, 2 and 3.
+template <int depos_order>
+AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
+int compute_shifted_shape_factor(Real* const sx, Real x_old, int j_now) {return 0;};
+
+// Compute shape factor for order 1.
+template <>
+AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
+int compute_shifted_shape_factor <1> (Real* const sx, Real x_old, int j_now){
+ int j = (int) x_old;
+ int i_shift = j - j_now;
+ Real xint = x_old - j;
+ sx[1+i_shift] = 1.0 - xint;
+ sx[2+i_shift] = xint;
+ return j;
+}
+
+// Compute shape factor for order 2.
+template <>
+AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
+int compute_shifted_shape_factor <2> (Real* const sx, Real x_old, int j_now){
+ int j = (int) (x_old+0.5);
+ int i_shift = j - (j_now + 1);
+ Real xint = x_old - j;
+ sx[1+i_shift] = 0.5*(0.5-xint)*(0.5-xint);
+ sx[2+i_shift] = 0.75-xint*xint;
+ sx[3+i_shift] = 0.5*(0.5+xint)*(0.5+xint);
+ // index of the leftmost cell where particle deposits
+ return j-1;
+}
+
+// Compute shape factor for order 3.
+template <>
+AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
+int compute_shifted_shape_factor <3> (Real* const sx, Real x_old, int j_now){
+ int j = (int) x_old;
+ int i_shift = j - (j_now + 1);
+ Real xint = x_old - j;
+ sx[1+i_shift] = 1.0/6.0*(1.0-xint)*(1.0-xint)*(1.0-xint);
+ sx[2+i_shift] = 2.0/3.0-xint*xint*(1-xint/2.0);
+ sx[3+i_shift] = 2.0/3.0-(1-xint)*(1-xint)*(1.0-0.5*(1-xint));
+ sx[4+i_shift] = 1.0/6.0*xint*xint*xint;
+ // index of the leftmost cell where particle deposits
+ return j-1;
+}
+
+/* \brief Esirkepov Current Deposition for thread thread_num
+ * /param xp, yp, zp : Pointer to arrays of particle positions.
+ * \param wp : Pointer to array of particle weights.
+ * \param uxp uyp uzp : Pointer to arrays of particle momentum.
+ * \param jx_arr : Array4 of current density, either full array or tile.
+ * \param jy_arr : Array4 of current density, either full array or tile.
+ * \param jz_arr : Array4 of current density, either full array or tile.
+ * \param offset : Index of first particle for which current is deposited
+ * \param np_to_depose : Number of particles for which current is deposited.
+ Particles [offset,offset+np_tp_depose] deposit current.
+ * \param dt : Time step for particle level
+ * \param dx : 3D cell size
+ * \param xyzmin : Physical lower bounds of domain.
+ * \param lo : Index lower bounds of domain.
+ * /param q : species charge.
+ */
+template <int depos_order>
+void doEsirkepovDepositionShapeN(const Real * const xp, const Real * const yp, const Real * const zp,
+ const Real * const wp, const Real * const uxp,
+ const Real * const uyp, const Real * const uzp,
+ const amrex::Array4<amrex::Real>& jx_arr,
+ const amrex::Array4<amrex::Real>& jy_arr,
+ const amrex::Array4<amrex::Real>& jz_arr,
+ const long offset, const long np_to_depose,
+ const amrex::Real dt, const std::array<amrex::Real,3>& dx,
+ const std::array<Real, 3> xyzmin,
+ const Dim3 lo,
+ const amrex::Real q)
+{
+ const Real dxi = 1.0/dx[0];
+ const Real dyi = 1.0/dx[1];
+ const Real dzi = 1.0/dx[2];
+ const Real dtsdx0 = dt*dxi;
+ const Real dtsdy0 = dt*dyi;
+ const Real dtsdz0 = dt*dzi;
+ const Real invdtdx = 1.0/(dt*dx[1]*dx[2]);
+ const Real invdtdy = 1.0/(dt*dx[0]*dx[2]);
+ const Real invdtdz = 1.0/(dt*dx[0]*dx[1]);
+
+ const Real xmin = xyzmin[0];
+ const Real ymin = xyzmin[1];
+ const Real zmin = xyzmin[2];
+ const Real clightsq = 1.0/PhysConst::c/PhysConst::c;
+
+ // Loop over particles and deposit into jx_arr, jy_arr and jz_arr
+ ParallelFor( np_to_depose,
+ [=] AMREX_GPU_DEVICE (long ip) {
+ // --- Get particle quantities
+ const Real gaminv = 1.0/std::sqrt(1.0 + uxp[ip]*uxp[ip]*clightsq
+ + uyp[ip]*uyp[ip]*clightsq
+ + uzp[ip]*uzp[ip]*clightsq);
+
+ // wqx, wqy wqz are particle current in each direction
+ const Real wq = q*wp[ip];
+ const Real wqx = wq*invdtdx;
+ const Real wqy = wq*invdtdy;
+ const Real wqz = wq*invdtdz;
+
+ // computes current position in grid units
+ const Real x_now = (xp[ip] - xmin)*dxi;
+ const Real y_now = (yp[ip] - ymin)*dyi;
+ const Real z_now = (zp[ip] - zmin)*dzi;
+
+ // computes old position in grid units
+ const Real x_old = x_now - dtsdx0*uxp[ip]*gaminv;
+ const Real y_old = y_now - dtsdy0*uyp[ip]*gaminv;
+ const Real z_old = z_now - dtsdz0*uzp[ip]*gaminv;
+
+ // Shape factor arrays
+ // Note that there are extra values above and below
+ // to possibly hold the factor for the old particle
+ // which can be at a different grid location.
+ Real AMREX_RESTRICT sx_now[depos_order + 3];
+ Real AMREX_RESTRICT sy_now[depos_order + 3];
+ Real AMREX_RESTRICT sz_now[depos_order + 3];
+ Real AMREX_RESTRICT sx_old[depos_order + 3];
+ Real AMREX_RESTRICT sy_old[depos_order + 3];
+ Real AMREX_RESTRICT sz_old[depos_order + 3];
+
+ // --- Compute shape factors
+ // Compute shape factors for position as they are now and at old positions
+ // [jkl]_now: leftmost grid point that the particle touches
+ const int j_now = compute_shape_factor<depos_order>(sx_now+1, x_now);
+ const int k_now = compute_shape_factor<depos_order>(sy_now+1, y_now);
+ const int l_now = compute_shape_factor<depos_order>(sz_now+1, z_now);
+
+ const int j_old = compute_shifted_shape_factor<depos_order>(sx_old, x_old, j_now);
+ const int k_old = compute_shifted_shape_factor<depos_order>(sy_old, y_old, k_now);
+ const int l_old = compute_shifted_shape_factor<depos_order>(sz_old, z_old, l_now);
+
+ // computes min/max positions of current contributions
+ int djs = 1, dje = 1;
+ if (j_old < j_now) djs = 0;
+ if (j_old > j_now) dje = 0;
+ int dks = 1, dke = 1;
+ if (k_old < k_now) dks = 0;
+ if (k_old > k_now) dke = 0;
+ int dls = 1, dle = 1;
+ if (l_old < l_now) dls = 0;
+ if (l_old > l_now) dle = 0;
+
+ std::cout << "JJJ " << depos_order << " " << lo.z << " " << l_now-1 << " " << zp[ip] << " " << zmin << " " << dx[2] << "\n";
+ for (int l=dls; l<=depos_order+2-dle; l++){
+ for (int k=dks; k<=depos_order+2-dke; k++){
+ Real sdxi = 0.;
+ for (int j=djs; j<=depos_order+1-dje; j++){
+ sdxi += wqx*(sx_old[j] - sx_now[j])*((sy_now[k] + 0.5*(sy_old[k] - sy_now[k]))*sz_now[l] +
+ (0.5*sy_now[k] + 1./3.*(sy_old[k] - sy_now[k]))*(sz_old[l] - sz_now[l]));
+ amrex::Gpu::Atomic::Add( &jx_arr(lo.x+j_now-1+j, lo.y+k_now-1+k, lo.z+l_now-1+l), sdxi);
+ }
+ }
+ }
+
+ for (int l=dls; l<=depos_order+2-dle; l++){
+ for (int j=djs; j<=depos_order+2-dje; j++){
+ Real sdyj = 0.;
+ for (int k=dks; k<=depos_order+1-dke; k++){
+ sdyj += wqy*(sy_old[k] - sy_now[k])*((sz_now[l] + 0.5*(sz_old[l] - sz_now[l]))*sx_now[l] +
+ (0.5*sz_now[l] + 1./3.*(sz_old[l] - sz_now[l]))*(sx_old[l] - sx_now[l]));
+ amrex::Gpu::Atomic::Add( &jy_arr(lo.x+j_now-1+j, lo.y+k_now-1+k, lo.z+l_now-1+l), sdyj);
+ }
+ }
+ }
+
+ for (int k=dks; k<=depos_order+2-dke; k++){
+ for (int j=djs; j<=depos_order+2-dje; j++){
+ Real sdzk = 0.;
+ for (int l=dls; l<=depos_order+1-dle; l++){
+ sdzk += wqz*(sz_old[l] - sz_now[l])*((sx_now[l] + 0.5*(sx_old[l] - sx_now[l]))*sy_now[k] +
+ (0.5*sx_now[l] + 1./3.*(sx_old[l] - sx_now[l]))*(sy_old[k] - sy_now[k]));
+ amrex::Gpu::Atomic::Add( &jz_arr(lo.x+j_now-1+j, lo.y+k_now-1+k, lo.z+l_now-1+l), sdzk);
+ }
+ }
+ }
+ }
+ );
+
+}
+
#endif // CURRENTDEPOSITION_H_
diff --git a/Source/Particles/WarpXParticleContainer.cpp b/Source/Particles/WarpXParticleContainer.cpp
index 7316dcc95..5a3f9242f 100644
--- a/Source/Particles/WarpXParticleContainer.cpp
+++ b/Source/Particles/WarpXParticleContainer.cpp
@@ -6,6 +6,7 @@
#include <AMReX_AmrParGDB.H>
#include <WarpX_f.H>
#include <WarpX.H>
+#include <WarpXAlgorithmSelection.H>
// Import low-level single-particle kernels
#include <GetAndSetPosition.H>
@@ -510,21 +511,40 @@ WarpXParticleContainer::DepositCurrent(WarpXParIter& pti,
// Better for memory? worth trying?
const Dim3 lo = lbound(tilebox);
- if (WarpX::nox == 1){
- doDepositionShapeN<1>(xp, yp, zp, wp.dataPtr(), uxp.dataPtr(),
- uyp.dataPtr(), uzp.dataPtr(), jx_arr, jy_arr,
- jz_arr, offset, np_to_depose, dt, dx,
- xyzmin, lo, stagger_shift, q);
- } else if (WarpX::nox == 2){
- doDepositionShapeN<2>(xp, yp, zp, wp.dataPtr(), uxp.dataPtr(),
- uyp.dataPtr(), uzp.dataPtr(), jx_arr, jy_arr,
- jz_arr, offset, np_to_depose, dt, dx,
- xyzmin, lo, stagger_shift, q);
- } else if (WarpX::nox == 3){
- doDepositionShapeN<3>(xp, yp, zp, wp.dataPtr(), uxp.dataPtr(),
- uyp.dataPtr(), uzp.dataPtr(), jx_arr, jy_arr,
- jz_arr, offset, np_to_depose, dt, dx,
- xyzmin, lo, stagger_shift, q);
+ if (WarpX::current_deposition_algo == CurrentDepositionAlgo::Esirkepov) {
+ if (WarpX::nox == 1){
+ doEsirkepovDepositionShapeN<1>(xp, yp, zp, wp.dataPtr(), uxp.dataPtr(),
+ uyp.dataPtr(), uzp.dataPtr(), jx_arr, jy_arr,
+ jz_arr, offset, np_to_depose, dt, dx,
+ xyzmin, lo, q);
+ } else if (WarpX::nox == 2){
+ doEsirkepovDepositionShapeN<2>(xp, yp, zp, wp.dataPtr(), uxp.dataPtr(),
+ uyp.dataPtr(), uzp.dataPtr(), jx_arr, jy_arr,
+ jz_arr, offset, np_to_depose, dt, dx,
+ xyzmin, lo, q);
+ } else if (WarpX::nox == 3){
+ doEsirkepovDepositionShapeN<3>(xp, yp, zp, wp.dataPtr(), uxp.dataPtr(),
+ uyp.dataPtr(), uzp.dataPtr(), jx_arr, jy_arr,
+ jz_arr, offset, np_to_depose, dt, dx,
+ xyzmin, lo, q);
+ }
+ } else {
+ if (WarpX::nox == 1){
+ doDepositionShapeN<1>(xp, yp, zp, wp.dataPtr(), uxp.dataPtr(),
+ uyp.dataPtr(), uzp.dataPtr(), jx_arr, jy_arr,
+ jz_arr, offset, np_to_depose, dt, dx,
+ xyzmin, lo, stagger_shift, q);
+ } else if (WarpX::nox == 2){
+ doDepositionShapeN<2>(xp, yp, zp, wp.dataPtr(), uxp.dataPtr(),
+ uyp.dataPtr(), uzp.dataPtr(), jx_arr, jy_arr,
+ jz_arr, offset, np_to_depose, dt, dx,
+ xyzmin, lo, stagger_shift, q);
+ } else if (WarpX::nox == 3){
+ doDepositionShapeN<3>(xp, yp, zp, wp.dataPtr(), uxp.dataPtr(),
+ uyp.dataPtr(), uzp.dataPtr(), jx_arr, jy_arr,
+ jz_arr, offset, np_to_depose, dt, dx,
+ xyzmin, lo, stagger_shift, q);
+ }
}
#ifndef AMREX_USE_GPU
diff --git a/Source/WarpX.cpp b/Source/WarpX.cpp
index 08948227c..18d76c07e 100644
--- a/Source/WarpX.cpp
+++ b/Source/WarpX.cpp
@@ -492,10 +492,6 @@ WarpX::ReadParameters ()
pp.query("use_picsar_deposition", use_picsar_deposition);
#endif
current_deposition_algo = GetAlgorithmInteger(pp, "current_deposition");
- if (!use_picsar_deposition){
- AMREX_ALWAYS_ASSERT_WITH_MESSAGE( current_deposition_algo >= 2,
- "if not use_picsar_deposition, cannot use Esirkepov deposition.");
- }
charge_deposition_algo = GetAlgorithmInteger(pp, "charge_deposition");
field_gathering_algo = GetAlgorithmInteger(pp, "field_gathering");
particle_pusher_algo = GetAlgorithmInteger(pp, "particle_pusher");
generated by cgit v1.2.3 (git 2.46.0) at 2025-08-17 02:12:27 +0000