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Fix Periodic Neighborhood Checking #1608

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Fix Periodic Neighborhood Checking #1608

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4018cb9
Fixed an edge case in periodic bounds checking for neighborhood size …
danieljvickers Jun 17, 2026
195bbef
Merge branch 'master' into fix-periodic-neighborhood-bounds-check
danieljvickers Jun 18, 2026
aa6f7b1
Merge branch 'master' into fix-periodic-neighborhood-bounds-check
danieljvickers Jun 20, 2026
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7 changes: 7 additions & 0 deletions src/simulation/m_start_up.fpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1494,6 +1494,13 @@ contains
call MPI_SENDRECV(end_val, 1, mpi_p, send_neighbor, ${TAG + 1}$, recv_val, 1, mpi_p, recv_neighbor, &
& ${TAG + 1}$, MPI_COMM_WORLD, MPI_STATUS_IGNORE, ierr)
end_val = recv_val

! protect from looping back around on yourself multiple times
if (f_approx_equal(beg_val, ${X}$_cb(${DIM}$)) .or. f_approx_equal(end_val, ${X}$_cb(-1))) then
beg_val = -huge(0._wp)
end_val = huge(0._wp)
exit
end if
end do
neighbor_domain_${X}$%beg = beg_val
neighbor_domain_${X}$%end = end_val
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