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update_eh.cpp
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update_eh.cpp
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/* Copyright (C) 2005-2021 Massachusetts Institute of Technology
%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2, or (at your option)
% any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; if not, write to the Free Software Foundation,
% Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <string.h>
#include "meep.hpp"
#include "meep_internals.hpp"
using namespace std;
namespace meep {
void fields::update_eh(field_type ft, bool skip_w_components) {
if (ft != E_stuff && ft != H_stuff) abort("update_eh only works with E/H");
for (int i = 0; i < num_chunks; i++)
if (chunks[i]->is_mine())
if (chunks[i]->update_eh(ft, skip_w_components))
chunk_connections_valid = false; // E/H allocated - reconnect chunks
}
bool fields_chunk::needs_W_prev(component c) const {
for (susceptibility *chiP = s->chiP[type(c)]; chiP; chiP = chiP->next)
if (chiP->needs_W_prev()) return true;
return false;
}
bool fields_chunk::update_eh(field_type ft, bool skip_w_components) {
field_type ft2 = ft == E_stuff ? D_stuff : B_stuff; // for sources etc.
bool allocated_eh = false;
bool have_int_sources = false;
if (!doing_solve_cw) {
for (src_vol *sv = sources[ft2]; sv; sv = sv->next)
if (sv->t->is_integrated) {
have_int_sources = true;
break;
}
}
FOR_FT_COMPONENTS(ft, ec) {
component dc = field_type_component(ft2, ec);
DOCMP {
bool need_fmp = false;
if (f[ec][cmp]) {
need_fmp = have_int_sources;
for (polarization_state *p = pol[ft]; p && !need_fmp; p = p->next)
need_fmp = need_fmp || p->s->needs_P(ec, cmp, f);
}
if (need_fmp) {
if (!f_minus_p[dc][cmp]) f_minus_p[dc][cmp] = new realnum[gv.ntot()];
}
else if (f_minus_p[dc][cmp]) { // remove unneeded f_minus_p
delete[] f_minus_p[dc][cmp];
f_minus_p[dc][cmp] = 0;
}
}
}
bool have_f_minus_p = false;
FOR_FT_COMPONENTS(ft2, dc) {
if (f_minus_p[dc][0]) {
have_f_minus_p = true;
break;
}
}
const size_t ntot = s->gv.ntot();
if (have_f_minus_p && doing_solve_cw)
abort("dispersive materials are not yet implemented for solve_cw");
//////////////////////////////////////////////////////////////////////////
// First, initialize f_minus_p to D - P, if necessary
FOR_FT_COMPONENTS(ft, ec) if (f[ec][0]) {
component dc = field_type_component(ft2, ec);
DOCMP if (f_minus_p[dc][cmp]) {
realnum *fmp = f_minus_p[dc][cmp];
memcpy(fmp, f[dc][cmp], sizeof(realnum) * ntot);
}
}
for (polarization_state *p = pol[ft]; p; p = p->next)
if (p->data) p->s->subtract_P(ft, f_minus_p, p->data);
//////////////////////////////////////////////////////////////////////////
// Next, subtract time-integrated sources (i.e. polarizations, not currents)
if (have_f_minus_p && !doing_solve_cw) {
for (src_vol *sv = sources[ft2]; sv; sv = sv->next) {
if (sv->t->is_integrated && f[sv->c][0] && ft == type(sv->c)) {
component c = field_type_component(ft2, sv->c);
for (size_t j = 0; j < sv->npts; ++j) {
const complex<double> A = sv->dipole(j);
DOCMP { f_minus_p[c][cmp][sv->index[j]] -= (cmp) ? imag(A) : real(A); }
}
}
}
}
//////////////////////////////////////////////////////////////////////////
// Finally, compute E = chi1inv * D
realnum *dmp[NUM_FIELD_COMPONENTS][2];
FOR_FT_COMPONENTS(ft2, dc) DOCMP2 {
dmp[dc][cmp] = f_minus_p[dc][cmp] ? f_minus_p[dc][cmp] : f[dc][cmp];
}
DOCMP FOR_FT_COMPONENTS(ft, ec) {
if (f[ec][cmp]) {
if (type(ec) != ft) abort("bug in FOR_FT_COMPONENTS");
component dc = field_type_component(ft2, ec);
const direction d_ec = component_direction(ec);
const ptrdiff_t s_ec = gv.stride(d_ec) * (ft == H_stuff ? -1 : +1);
const direction d_1 = cycle_direction(gv.dim, d_ec, 1);
const component dc_1 = direction_component(dc, d_1);
const ptrdiff_t s_1 = gv.stride(d_1) * (ft == H_stuff ? -1 : +1);
const direction d_2 = cycle_direction(gv.dim, d_ec, 2);
const component dc_2 = direction_component(dc, d_2);
const ptrdiff_t s_2 = gv.stride(d_2) * (ft == H_stuff ? -1 : +1);
direction dsigw0 = d_ec;
direction dsigw = s->sigsize[dsigw0] > 1 ? dsigw0 : NO_DIRECTION;
// lazily allocate any E/H fields that are needed (H==B initially)
if (f[ec][cmp] == f[dc][cmp] &&
(s->chi1inv[ec][d_ec] || have_f_minus_p || dsigw != NO_DIRECTION)) {
f[ec][cmp] = new realnum[gv.ntot()];
memcpy(f[ec][cmp], f[dc][cmp], gv.ntot() * sizeof(realnum));
allocated_eh = true;
}
// lazily allocate W auxiliary field
if (!f_w[ec][cmp] && dsigw != NO_DIRECTION) {
f_w[ec][cmp] = new realnum[gv.ntot()];
memcpy(f_w[ec][cmp], f[ec][cmp], gv.ntot() * sizeof(realnum));
if (needs_W_notowned(ec)) allocated_eh = true; // communication needed
}
// for solve_cw, when W exists we get W and E from special variables
if (f_w[ec][cmp] && skip_w_components) continue;
// save W field from this timestep in f_w_prev if needed by pols
if (needs_W_prev(ec)) {
if (!f_w_prev[ec][cmp]) f_w_prev[ec][cmp] = new realnum[gv.ntot()];
memcpy(f_w_prev[ec][cmp], f_w[ec][cmp] ? f_w[ec][cmp] : f[ec][cmp],
sizeof(realnum) * gv.ntot());
}
if (f[ec][cmp] != f[dc][cmp])
STEP_UPDATE_EDHB(f[ec][cmp], ec, gv, dmp[dc][cmp], dmp[dc_1][cmp], dmp[dc_2][cmp],
s->chi1inv[ec][d_ec], dmp[dc_1][cmp] ? s->chi1inv[ec][d_1] : NULL,
dmp[dc_2][cmp] ? s->chi1inv[ec][d_2] : NULL, s_ec, s_1, s_2, s->chi2[ec],
s->chi3[ec], f_w[ec][cmp], dsigw, s->sig[dsigw], s->kap[dsigw]);
}
}
/* Do annoying special cases for r=0 in cylindrical coords. Note
that this only really matters for field output; the Ez and Ep
components at r=0 don't usually affect the fields elsewhere
because of the form of Maxwell's equations in cylindrical coords. */
// (FIXME: handle Kerr case? Do we care about auxiliary PML fields here?)
if (gv.dim == Dcyl && gv.origin_r() == 0.0) DOCMP FOR_FT_COMPONENTS(ft, ec) {
if (f[ec][cmp] && (ec == Ep || ec == Ez || ec == Hr)) {
component dc = field_type_component(ft2, ec);
if (f[ec][cmp] == f[dc][cmp]) continue;
const int yee_idx = gv.yee_index(ec);
const int d_ec = component_direction(ec);
const int sR = gv.stride(R), nZ = gv.num_direction(Z);
realnum *E = f[ec][cmp];
const realnum *D = f_minus_p[dc][cmp] ? f_minus_p[dc][cmp] : f[dc][cmp];
const realnum *chi1inv = s->chi1inv[ec][d_ec];
if (chi1inv)
for (int iZ = 0; iZ < nZ; iZ++) {
const int i = yee_idx + iZ - sR;
E[i] = chi1inv[i] * D[i];
}
else
for (int iZ = 0; iZ < nZ; iZ++) {
const int i = yee_idx + iZ - sR;
E[i] = D[i];
}
}
}
return allocated_eh;
}
} // namespace meep