Update susceptibility.cpp #238
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Added checks in update_P: check, whether there is a diagonal element before you add contributions from off-diagonal elements. This avoids instabilities at boundaries for non-diagonal sigma.
stevengj
reviewed
Mar 20, 2018
| LOOP_OVER_VOL_OWNED(gv, c, i) { | ||
| LOOP_OVER_VOL_OWNED(gv, c, i) if(s[i]!=0) { | ||
| //"if" to avoid instabilities coming from yee-grid shifts of off-diagnal elements | ||
| + //FIXME: this prevents materials with pure off-diagonal sigma from working |
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Wouldn't a purely off-diagonal sigma matrix be indefinite, and hence lead to both loss and gain?
stevengj
reviewed
Mar 20, 2018
| realnum pcur = p[i]; | ||
| p[i] = gamma1inv * (pcur * (2 - omega0dtsqr_denom) | ||
| - gamma1 * pp[i] | ||
| + omega0dtsqr * (s[i] * w[i] | ||
| + OFFDIAG(s1,w1,is1,is) | ||
| + OFFDIAG(s2,w2,is2,is))); | ||
| pp[i] = pcur; | ||
| }else{ | ||
| p[i]=0; //seems unnecessary, but no harm is done here |
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Delete the else clause, since p[i] is initialized to zero anyway.
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Added checks in update_P: check, whether there is a diagonal element before you add contributions from off-diagonal elements. This avoids instabilities at boundaries for non-diagonal sigma.