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Add C kernel for BSSN-EM (Maxwell/electromagnetic field) RHS computation

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New bssn_em_rhs_c.C computes EM field RHS (E,B,Kpsi,Kphi) and stress-energy
tensor, then calls the C BSSN RHS kernel with source terms. Replaces empart.f90
when USE_CXX_EM_KERNEL=1. Supports all ghost_width orders via existing derivative
kernels. Controlled by USE_CXX_EM_KERNEL switch (default 0, experimental).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
CGH0S7
2026-05-14 11:25:08 +08:00
parent ce1fdc9686
commit 461dfb99d8
4 changed files with 442 additions and 62 deletions
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AMSS_NCKU_source/makefile.inc
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@@ -59,6 +59,12 @@ USE_CXX_Z4C_KERNELS ?= 1
## Note: this requires USE_CXX_KERNELS=1 because the wrapper reuses the C BSSN kernel.
USE_CXX_ESCALAR_KERNEL ?= 1
## BSSN-EM RHS switch
## 1 : use BSSN-EM C kernel (bssn_em_rhs_c.C) on the normal patch path
## 0 : keep the original Fortran empart.f90 RHS for the EM fields (default)
## Note: experimental, requires USE_CXX_KERNELS=1
USE_CXX_EM_KERNEL ?= 0
## Cached transfer switch
## auto (default): enable for BSSN vacuum, keep other paths on the safe uncached path
## 1 : force cached Sync/Restrict/OutBd transfer on evolution hot paths