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init_grid_simple_airfoil.f90
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!
! Initialize grid file with anchor cells that form a simple airfoil.
!
subroutine init_grid
use parameters
use grid_commons
implicit none
integer:: igrid,iz,ibound,ix,iy,ibound2
integer::flag1ix,flag1iy,flag1iz,flag2ix,flag2iy,flag2iz
integer::flag1,flag2,flag
real(pre)::x,y,z,r,mslope,ael,bel,length,x0,aoa,xp,yp
ngrid=nx*ny*nz
print *,"# Total grid elements = ",ngrid
allocate(grid(ngrid))
allocate(phi(ngrid))
allocate(p (ngrid))
allocate(adindx (ngrid))
allocate(muc_array (ngrid))
allocate(cons(5,ngrid))
allocate(cons_old(5,ngrid))
allocate(cons_new(5,ngrid))
allocate(u (3,ngrid))
allocate(qq (3,ngrid))
allocate(gforce (3,ngrid))
allocate(pforce (3,ngrid))
allocate(rhotot(ngrid))
nullify(cons_pt)
call first_touch()
max_den_change_old=one
max_den_old=zero
nbound=0
nghost=0
nanchor=0
igrid=0
do iz=1,nz
flag1iz=0; if ((iz==1).or.(iz==nz))flag1iz=1
flag2iz=0; if ((iz==2).or.(iz==nz-1))flag2iz=1
z=dz*(dble(iz)-(dble(nz)+one)/two)
do iy=1,ny
flag1iy=0; if ((iy==1).or.(iy==ny))flag1iy=1
flag2iy=0; if ((iy==2).or.(iy==ny-1))flag2iy=1
y=dy*(dble(iy)-(dble(ny)+one)/two)
do ix=1,nx
flag1ix=0; if ((ix==1).or.(ix==nx))flag1ix=1
flag2ix=0; if ((ix==2).or.(ix==nx-1))flag2ix=1
x=dx*(dble(ix)-(dble(nx)+one)/two)
igrid=igrid+1
grid(igrid)%boundary=0
flag1=flag1iz+flag1ix+flag1iy
flag2=flag2iz+flag2ix+flag2iy
if(flag1>0)then
grid(igrid)%boundary=1
nbound=nbound+1
nghost=nghost+1
elseif(flag2>0)then
grid(igrid)%boundary=2
nghost=nghost+1
endif
grid(igrid)%id=igrid
grid(igrid)%ix=ix
grid(igrid)%iy=iy
grid(igrid)%iz=iz
grid(igrid)%x=x
grid(igrid)%y=y
grid(igrid)%z=z
enddo
enddo
enddo
allocate(indx_bound(nbound))
print *, "Allocated ",nbound," boundary cells"
allocate(indx_ghost(nghost))
print *, "Allocated ",nghost," ghost cells"
! create a huge sphere
#ifdef EXTRAANCHORS
ael=40d0*dx
bel=15d0*dx
x0=-25.7*dx
length=110d0*dx
mslope=0.314422
nanchor=0
aoa=-0.*pi/180.
do igrid=1,ngrid
xp=grid(igrid)%x-75*dx
yp=grid(igrid)%y
z=grid(igrid)%z
x=xp*cos(aoa)+yp*sin(aoa)
y=xp*sin(aoa)+yp*cos(aoa)
r=sqrt(x*x+y*y)
flag=0
r=(x/ael)**2+(y/bel)**2
if (r<=one)then
flag=1
else
if (x>=-(length-x0).and.x<=zero) then
if(y>=-bel)then
if(y<=(-bel+mslope*(x+length)).and.y<(-bel+mslope*(x0+length)))flag=1
endif
endif
endif
if (flag==1)then
nanchor=nanchor+1
grid(igrid)%boundary=3
endif
enddo
print *, nanchor,dble(nanchor)/dble(ngrid)
allocate(indx_anchor(nanchor))
ibound=0
do igrid=1,ngrid
if(grid(igrid)%boundary>2)then
ibound=ibound+1
indx_anchor(ibound)=igrid
endif
enddo
#endif
ibound=0
ibound2=0
do igrid=1,ngrid
if(grid(igrid)%boundary==1)then
ibound=ibound+1
indx_bound(ibound)=igrid
ibound2=ibound2+1
indx_ghost(ibound2)=igrid
ix=grid(igrid)%ix
iy=grid(igrid)%iy
iz=grid(igrid)%iz
grid(igrid)%ineigh(:)=0
if(ix==1)then ! always store the boundary donor in neighbor 1
grid(igrid)%ineigh(1)=grid(igrid)%id+2
elseif(ix==nx)then
grid(igrid)%ineigh(1)=grid(igrid)%id-2
elseif(iy==1)then
grid(igrid)%ineigh(1)=grid(igrid)%id+2*nx
elseif(iy==ny)then
grid(igrid)%ineigh(1)=grid(igrid)%id-2*nx
elseif(iz==1)then
grid(igrid)%ineigh(1)=grid(igrid)%id+2*nx*ny
elseif(iz==nz)then
grid(igrid)%ineigh(1)=grid(igrid)%id-2*nx*ny
else
print *," Error. Grid boundary is not really a boundary."
stop"Forced stop in init_grid"
endif
elseif(grid(igrid)%boundary==2)then
ibound2=ibound2+1
indx_ghost(ibound2)=igrid
ix=grid(igrid)%ix
iy=grid(igrid)%iy
iz=grid(igrid)%iz
grid(igrid)%ineigh(:)=0
if(ix==2)then ! always store the boundary donor in neighbor 1
grid(igrid)%ineigh(1)=grid(igrid)%id+1
elseif(ix==nx-1)then
grid(igrid)%ineigh(1)=grid(igrid)%id-1
elseif(iy==2)then
grid(igrid)%ineigh(1)=grid(igrid)%id+nx
elseif(iy==ny-1)then
grid(igrid)%ineigh(1)=grid(igrid)%id-nx
elseif(iz==2)then
grid(igrid)%ineigh(1)=grid(igrid)%id+nx*ny
elseif(iz==nz-1)then
grid(igrid)%ineigh(1)=grid(igrid)%id-nx*ny
else
print *," Error. Grid boundary is not really a boundary."
stop"Forced stop in init_grid"
endif
else
grid(igrid)%ineigh(1)=grid(igrid)%id+nx
grid(igrid)%ineigh(2)=grid(igrid)%id-nx
grid(igrid)%ineigh(3)=grid(igrid)%id+1
grid(igrid)%ineigh(4)=grid(igrid)%id-1
grid(igrid)%ineigh(5)=grid(igrid)%id+nx*ny
grid(igrid)%ineigh(6)=grid(igrid)%id-nx*ny
endif
!if(grid(igrid)%boundary>0)print *, "BOUNDARY NEIGHBOR",igrid,ix,grid(igrid)%ineigh(1)
enddo
end subroutine
subroutine first_touch()
use parameters
use grid_commons
implicit none
integer :: igrid
!$OMP PARALLEL
!$OMP DO SCHEDULE(STATIC)
do igrid=1,ngrid
grid(igrid)%x=zero
grid(igrid)%y=zero
grid(igrid)%z=zero
grid(igrid)%ineigh=zero
grid(igrid)%id=zero
grid(igrid)%ix=zero
grid(igrid)%iy=zero
grid(igrid)%iz=zero
grid(igrid)%boundary=0
phi(igrid)=zero
p(igrid)=zero
adindx(igrid)=zero
muc_array(igrid)=zero
cons(:,igrid)=zero
cons_new(:,igrid)=zero
cons_old(:,igrid)=zero
u(:,igrid)=zero
qq(:,igrid)=zero
gforce(:,igrid)=zero
pforce(:,igrid)=zero
rhotot(igrid)=zero
enddo
!$OMP ENDDO
!$OMP END PARALLEL
end subroutine