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#if HAVE_CONFIG_H
# include "config.fh"
#endif
subroutine get_patch(g_fg, fg, ld_fg1, ld_fg2,
+ g_fld, fld, ld_fld1, ld_fld2,
+ g_bc, bc, ld_bc1, ii, jj)
#include "common"
c
integer ld_fg1, ld_fg2, ld_fld1, ld_fld2, ld_bc1
double precision fg(ld_fg1,ld_fg2, *)
double precision fld(ld_fld1, ld_fld2, *)
integer bc(ld_bc1, *)
integer g_fg, g_fld, g_bc
c
c Subroutine to handle cells at boundary
c
double precision rho, ux, uy, cspd2, dux, duy, a, b
integer i, j, ii, jj, k, l, kk, ll
integer bval
integer mask(-1:1,-1:1)
c
c Locate local and absolute indices of cell
c
i = ii - width(1) - 1 + lo(1)
j = jj - width(2) - 1 + lo(2)
c
c Check values of neighboring cells
c
do l = -1, 1
do k = -1, 1
if (i+k.ge.1.and.i+k.le.size(1).and.
+ j+l.ge.1.and.j+l.le.size(2)) then
if (bc(ii+k,jj+l).ne.0) then
mask(k,l) = 2
else
mask(k,l) = 0
endif
else
mask(k,l) = 2
endif
end do
end do
c
c Determine if cells in mask represent interior cells or are
c on the boundary
c
do l = -1, 1
do k = -1, 1
if (mask(k,l).ne.0.and.(k.ne.0.or.l.ne.0)) then
do ll = max(l-1,-1), min(l+1,1)
do kk = max(k-1,-1), min(k+1,1)
if (mask(kk,ll).eq.0) mask(k,l) = 1
end do
end do
endif
end do
end do
c
c Evaluate distribution in boundary patch
c
bval = bc(ii,jj)
c
c Apply simple bounce back condition
c
if (bval.eq.1) then
do l = -1, 1
do k = -1, 1
if (mask(k,l).eq.2) then
fgp(k,l,ihash(k,l)) = fg(ii,jj,hash(k,l)+18)
else
fgp(k,l,ihash(k,l)) = fg(ii+k,jj+l,ihash(k,l)+18)
endif
end do
end do
c
c Apply constant velocity boundary condition to flat upper boundary
c
else if (bval.eq.2) then
cspd2 = cspd/sqrt(2.0d00)
rho = 0.0d00
ux = 0.0d00
uy = 0.0d00
do l = -1, 1
do k = -1, 1
if (mask(k,l).eq.2) then
fgp(k,l,ihash(k,l)) = fg(ii,jj,hash(k,l)+18)
else
fgp(k,l,ihash(k,l)) = fg(ii+k,jj+l,ihash(k,l)+18)
endif
rho = rho + fgp(k,l,ihash(k,l))
ux = ux - cspd2*dble(k)*fgp(k,l,ihash(k,l))
uy = uy - cspd2*dble(l)*fgp(k,l,ihash(k,l))
end do
end do
ux = ux/rho
uy = uy/rho
ux = uxbc - ux
c
c Add corrections needed to adjust for velocity mismatch
c
fgp(1,1,ihash(1,1)) = fgp(1,1,ihash(1,1))
+ - 0.5d00*rho*ux/cspd2
fgp(-1,1,ihash(-1,1)) = fgp(-1,1,ihash(-1,1))
+ + 0.5d00*rho*ux/cspd2
cc fgp(1,1,ihash(1,1)) = fgp(1,1,ihash(1,1))
cc + - 0.5d00*rho*ux/cspd2
cc + - rho*uy/(3.0d00*cspd2)
cc fgp(0,1,ihash(0,1)) = fgp(0,1,ihash(0,1))
cc + - rho*uy/(3.0d00*cspd2)
cc fgp(-1,1,ihash(-1,1)) = fgp(-1,1,ihash(-1,1))
cc + + 0.5d00*rho*ux/cspd2
cc + - rho*uy/(3.0d00*cspd2)
c ux = uxbc
c uy = 0.0d00
c rho = (cspd2/(uy+cspd2))*(fg(ii,jj,ihash(0,0)+18)
c + + fg(ii+1,jj,ihash(1,0)+18)+fg(ii-1,jj,ihash(-1,0)+18)
c + + 2.0d00*(fg(ii-1,jj-1,ihash(-1,-1)+18)
c + + fg(ii,jj-1,ihash(0,-1)+18)+fg(ii+1,jj-1,ihash(1,-1)+18)))
c fgp(0,1,ihash(0,1)) = fg(ii,jj-1,ihash(0,-1)+18)
c a = (rho*ux-cspd2*(-fg(ii-1,jj,ihash(1,0)+18)
c + + fg(ii+1,jj,ihash(1,0)+18)+fg(ii+1,jj+1,ihash(1,1)+18)
c + - fg(ii-1,jj+1,ihash(-1,1)+18)))/cspd2
c b = fg(ii+1,jj+1,ihash(1,1)+18)+fg(ii+1,jj-1,ihash(1,-1)+18)
c fgp(1,1,ihash(1,1)) = -0.5d00*(a+b)
c fgp(1,1,ihash(1,1)) = 0.5d00*(a-b)
c
c Apply constant velocity boundary condition
c
else if (bval.eq.3) then
cspd2 = sqrt(2.0d00)*cspd
rho = 0.0d00
ux = 0.0d00
uy = 0.0d00
do l = -1, 1
do k = -1, 1
if (mask(k,l).eq.2.and.(k.ne.0.or.l.ne.0)) then
fgp(k,l,ihash(k,l)) = fg(ii,jj,hash(k,l))
rho = rho + fg(ii,jj,hash(k,l))
ux = ux + cspd2*dble(k)*fg(ii,jj,hash(k,l))
uy = uy + cspd2*dble(l)*fg(ii,jj,hash(k,l))
else
fgp(k,l,ihash(k,l)) = fg(ii+k,jj+l,ihash(i,l))
rho = rho + fg(ii+k,jj+l,ihash(k,l))
ux = ux + cspd2*dble(k)*fg(ii+k,jj+l,ihash(k,l))
uy = uy + cspd2*dble(l)*fg(ii+k,jj+l,ihash(k,l))
endif
end do
end do
c
c Determine value of correction needed to get specified final
c velocity
c
dux = bcpar(2,1) - ux
duy = bcpar(2,2) - uy
endif
c
return
end
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