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add_dpdt.f
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add_dpdt.f
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subroutine add_dpdt(scal,pthermo,divu,umac,dx,dt,lo,hi,bc)
implicit none
include 'spec.h'
real*8 scal(-2:nfine+1,nscal)
real*8 pthermo(-2:nfine+1)
real*8 divu( 0:nfine-1) ! divu normally has a ghost cell; be careful when passing in
real*8 umac(0 :nfine )
real*8 dx
real*8 dt
integer lo,hi,bc(2)
real*8 uadv,p_lo,p_hi
real*8 ugradp
real*8 dpdt
integer i
do i=lo,hi
uadv = 0.5d0 * (umac(i) + umac(i+1))
if (umac(i) .ge. 0.d0) then
p_lo = pthermo(i-1)
else
p_lo = pthermo(i)
endif
if (umac(i+1) .ge. 0.d0) then
p_hi = pthermo(i)
else
p_hi = pthermo(i+1)
endif
ugradp = uadv * (p_hi - p_lo) / dx
dpdt = (pthermo(i) - Pcgs) / dt
! dpdt = dpdt - ugradp
divu(i) = divu(i) + dpdt*dpdt_factor/pthermo(i)
end do
end
subroutine add_dpdt_nodal(scal,pthermo,divu,vel,dx,dt,lo,hi,bc)
implicit none
include 'spec.h'
real*8 scal(-2:nfine+1,nscal)
real*8 pthermo(-2:nfine+1)
real*8 divu(0:nfine-1)
real*8 vel(-2:nfine+1)
real*8 dx
real*8 dt
integer lo,hi,bc(2)
real*8 uadv,p_lo,p_hi
real*8 ugradp
real*8 dpdt
integer i
do i=lo,hi
uadv = vel(i)
if (i .eq. lo .and. bc(1) .eq. 1) then
! inflow
p_lo = pthermo(i)
p_hi = pthermo(i+1)
else if (i .eq. hi .and. bc(2) .eq. 2) then
! outflow
p_lo = pthermo(i-1)
p_hi = pthermo(i)
else
if (uadv .ge. 0) then
p_lo = pthermo(i-1)
p_hi = pthermo(i)
else
p_lo = pthermo(i)
p_hi = pthermo(i+1)
end if
end if
ugradp = uadv * (p_hi - p_lo) / dx
dpdt = (pthermo(i) - Pcgs) / dt
! dpdt = dpdt - ugradp
divu(i) = divu(i) + dpdt*dpdt_factor/pthermo(i)
end do
end