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! Calculate first order upwinded differences.
! $Header$
idx = one / cctk_delta_space(1)
idy = one / cctk_delta_space(2)
idz = one / cctk_delta_space(3)
do k = 1, nz
do j = 1, ny
do i = 1, nx
if ( eh_mask(i,j,k) .ge. 0 ) then
if ( ( .not. btest(eh_mask(i,j,k),0) ) .and. &
( .not. btest(eh_mask(i,j,k),1) ) ) then
al = idx * ( f(i,j,k) - f(i-1,j,k) )
ar = idx * ( f(i+1,j,k) - f(i,j,k) )
else if ( btest(eh_mask(i,j,k),0) ) then
al = zero
ar = idx * ( f(i+1,j,k) - f(i,j,k) )
else
al = idx * ( f(i,j,k) - f(i-1,j,k) )
ar = zero
end if
if ( ( .not. btest(eh_mask(i,j,k),2) ) .and. &
( .not. btest(eh_mask(i,j,k),3) ) ) then
bl = idy * ( f(i,j,k) - f(i,j-1,k) )
br = idy * ( f(i,j+1,k) - f(i,j,k) )
else if ( btest(eh_mask(i,j,k),2) ) then
bl = zero
br = idy * ( f(i,j+1,k) - f(i,j,k) )
else
bl = idy * ( f(i,j,k) - f(i,j-1,k) )
br = zero
end if
if ( ( .not. btest(eh_mask(i,j,k),4) ) .and. &
( .not. btest(eh_mask(i,j,k),5) ) ) then
cl = idz * ( f(i,j,k) - f(i,j,k-1) )
cr = idz * ( f(i,j,k+1) - f(i,j,k) )
else if ( btest(eh_mask(i,j,k),4) ) then
cl = zero
cr = idz * ( f(i,j,k+1) - f(i,j,k) )
else
cl = idz * ( f(i,j,k) - f(i,j,k-1) )
cr = zero
end if
alminus = half*(al-abs(al))
alplus = half*(al+abs(al))
arminus = half*(ar-abs(ar))
arplus = half*(ar+abs(ar))
blminus = half*(bl-abs(bl))
blplus = half*(bl+abs(bl))
brminus = half*(br-abs(br))
brplus = half*(br+abs(br))
clminus = half*(cl-abs(cl))
clplus = half*(cl+abs(cl))
crminus = half*(cr-abs(cr))
crplus = half*(cr+abs(cr))
if ( f(i,j,k) .gt. 0 ) then
if ( abs(alplus) .gt. abs(arminus) ) then
dfx(i,j,k) = alplus
else
dfx(i,j,k) = arminus
end if
if ( abs(blplus) .gt. abs(brminus) ) then
dfy(i,j,k) = blplus
else
dfy(i,j,k) = brminus
end if
if ( abs(clplus) .gt. abs(crminus) ) then
dfz(i,j,k) = clplus
else
dfz(i,j,k) = crminus
end if
endif
if ( f(i,j,k) .lt. 0 ) then
if ( abs(alminus) .gt. abs(arplus) ) then
dfx(i,j,k) = alminus
else
dfx(i,j,k) = arplus
end if
if ( abs(blminus) .gt. abs(brplus) ) then
dfy(i,j,k) = blminus
else
dfy(i,j,k) = brplus
end if
if ( abs(clminus) .gt. abs(crplus) ) then
dfz(i,j,k) = clminus
else
dfz(i,j,k) = crplus
end if
end if
else
dfx(i,j,k) = zero
dfy(i,j,k) = zero
dfz(i,j,k) = zero
end if
end do
end do
end do
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