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discretisation_upwind.f90
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discretisation_upwind.f90
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subroutine discretisation_upwind()
use variables
implicit none
!!! u_star calculation (x component) !!!
!$OMP PARALLEL DO PRIVATE(i,j,k)
do k=1,nz
do j=1,ny
do i=1,nx-1
u_tilde_x1 = 0.5 * (u(i,j,k)+u(i+1,j,k)) !1 for +(i or j)
u_tilde_x2 = 0.5 * (u(i-1,j,k)+u(i,j,k)) !2 for -(i or j)
v_tilde_x1 = 0.5 * (v(i,j,k)+v(i+1,j,k))
v_tilde_x2 = 0.5 * (v(i,j-1,k)+v(i+1,j-1,k))
w_tilde_x1 = 0.5 * (w(i+1,j,k)+w(i,j,k))
w_tilde_x2 = 0.5 * (w(i,j,k-1)+w(i+1,j,k-1))
if (u_tilde_x1 >= 0) then
ue=u(i,j,k)
else
ue=u(i+1,j,k)
end if
if (u_tilde_x2 >= 0) then
uw=u(i-1,j,k)
else
uw=u(i,j,k)
end if
if (v_tilde_x1 >= 0) then
un=u(i,j,k)
else
un=u(i,j+1,k)
end if
if (v_tilde_x2 >= 0) then
us=u(i,j-1,k)
else
us=u(i,j,k)
end if
if (w_tilde_x1 >= 0) then
uf=u(i,j,k)
else
uf=u(i,j,k+1)
end if
if (w_tilde_x2 >= 0) then
ub=u(i,j,k-1)
else
ub=u(i,j,k)
end if
if (Q1 == 1) then
delta = ( Dxs(i)*iDy(j)*iDz(k) ) ** (1./3)
nut = (Cs*delta)**2 * ( 0.5*(1/Dxs(i)/Dxs(i))*((u(i+1,j,k)+u(i,j,k))-(u(i,j,k)+u(i-1,j,k)))**2 + &
0.5*(1/iDy(j)/iDy(j))*((v(i+1,j,k)+v(i,j,k))-(v(i+1,j-1,k)+v(i,j-1,k)))**2 + &
0.5*(1/iDz(k)/iDz(k))*((w(i+1,j,k)+w(i,j,k))-(w(i+1,j,k-1)+w(i,j,k-1)))**2 + &
( 0.5*(1/iDy(j))*((u(i,j+1,k)+u(i,j,k))-(u(i,j,k)+u(i,j-1,k)))+ &
0.5*(1/Dxs(i))*((v(i+1,j,k)+v(i+1,j-1,k))-(v(i,j,k)+v(i,j-1,k))) )**2 + &
( 0.5*(1/iDz(k))*((u(i,j,k+1)+u(i,j,k))-(u(i,j,k)+u(i,j,k-1)))+ &
0.5*(1/Dxs(i))*((w(i+1,j,k)+w(i+1,j,k-1))-(w(i,j,k)+w(i,j,k-1))) )**2 + &
( 0.5*(1/iDz(k))*((v(i+1,j,k+1)+v(i,j-1,k))-(v(i+1,j,k-1)+v(i,j-1,k)))+ &
0.5*(1/iDy(j))*((w(i+1,j+1,k)+w(i,j,k-1))-(w(i+1,j-1,k)+w(i,j,k-1))) )**2 )**0.5
end if
u_star(i,j,k) = u(i,j,k)-dt*(u_tilde_x1*ue-u_tilde_x2*uw) / Dxs(i) &
-dt*(v_tilde_x1*un-v_tilde_x2*us) / iDy(j) &
-dt*(w_tilde_x1*uf-w_tilde_x2*ub) / iDz(k) &
+(nu+nut*Q1)*dt*( (u(i+1,j,k)-u(i,j,k)) / iDx(i+1) - (u(i,j,k)-u(i-1,j,k)) / iDx(i) ) / Dxs(i) &
+(nu+nut*Q1)*dt*( (u(i,j+1,k)-u(i,j,k)) / Dys(j) - (u(i,j,k)-u(i,j-1,k)) / Dys(j-1) ) / iDy(j) &
+(nu+nut*Q1)*dt*( (u(i,j,k+1)-u(i,j,k)) / Dzs(k) - (u(i,j,k)-u(i,j,k-1)) / Dzs(k-1) ) / iDz(k)
end do
end do
end do
!$OMP END PARALLEL DO
!!! v_star calculation (y component) !!!
!$OMP PARALLEL DO PRIVATE(i,j,k)
do k=1,nz
do j=1,ny-1
do i=1,nx
u_tilde_y1 = 0.5 * (u(i,j,k)+u(i,j+1,k))
u_tilde_y2 = 0.5 * (u(i-1,j,k)+u(i-1,j+1,k))
v_tilde_y1 = 0.5 * (v(i,j,k)+v(i,j+1,k))
v_tilde_y2 = 0.5 * (v(i,j-1,k)+v(i,j,k))
w_tilde_y1 = 0.5 * (w(i,j,k)+w(i,j+1,k))
w_tilde_y2 = 0.5 * (w(i,j,k-1)+w(i,j+1,k-1))
if (u_tilde_y1 >= 0) then
ve=v(i,j,k)
else
ve=v(i+1,j,k)
end if
if (u_tilde_y2 >= 0) then
vw=v(i-1,j,k)
else
vw=v(i,j,k)
end if
if (v_tilde_y1 >= 0) then
vn=v(i,j,k)
else
vn=v(i,j+1,k)
end if
if (v_tilde_y2 >= 0) then
vs=v(i,j-1,k)
else
vs=v(i,j,k)
end if
if (w_tilde_y1 >= 0) then
vf=v(i,j,k)
else
vf=v(i,j,k+1)
end if
if (w_tilde_y2 >= 0) then
vb=v(i,j,k-1)
else
vb=v(i,j,k)
end if
if (Q1 == 1) then
delta = ( iDx(i)*Dys(j)*iDz(k) ) ** (1./3)
nut = (Cs*delta)**2 * ( 0.5*(1/iDx(i)/iDx(i))*((u(i,j+1,k)+u(i,j,k))-(u(i-1,j+1,k)+u(i-1,j,k)))**2 + &
0.5*(1/Dys(j)/Dys(j))*((v(i,j+1,k)+v(i,j,k))-(v(i,j,k)+v(i,j-1,k)))**2 + &
0.5*(1/iDz(k)/iDz(k))*((w(i,j+1,k)+w(i,j,k))-(w(i,j+1,k-1)+w(i,j,k-1)))**2 + &
( 0.5*(1/Dys(j))*((u(i,j+1,k)+u(i-1,j+1,k))-(u(i,j,k)+u(i-1,j,k)))+ &
0.5*(1/iDx(i))*((v(i+1,j,k)+v(i,j,k))-(v(i,j,k)+v(i-1,j,k))) )**2 + &
( 0.5*(1/iDz(k))*((u(i,j+1,k+1)+u(i-1,j,k))-(u(i,j+1,k-1)+u(i-1,j,k-1)))+ &
0.5*(1/iDx(i))*((w(i+1,j+1,k)+w(i,j,k-1))-(w(i-1,j+1,k)+w(i,j,k-1))) )**2 + &
( 0.5*(1/iDz(k))*((v(i,j,k+1)+v(i,j,k))-(v(i,j,k-1)+v(i,j,k)))+ &
0.5*(1/Dys(j))*((w(i,j+1,k)+w(i,j+1,k-1))-(w(i,j,k)+w(i,j,k-1))) )**2 )**0.5
end if
v_star(i,j,k) = v(i,j,k)-dt*(u_tilde_y1*ve-u_tilde_y2*vw) / iDx(i) &
-dt*(v_tilde_y1*vn-v_tilde_y2*vs) / Dys(j) &
-dt*(w_tilde_y1*vf-w_tilde_y2*vb) / iDz(k) &
+(nu+nut*Q1)*dt*( (v(i+1,j,k)-v(i,j,k)) / Dxs(i) - (v(i,j,k) - v(i-1,j,k)) / Dxs(i-1) ) / iDx(i) &
+(nu+nut*Q1)*dt*( (v(i,j+1,k)-v(i,j,k)) / iDy(j+1) - (v(i,j,k) - v(i,j-1,k)) / iDy(j) ) / Dys(j) &
+(nu+nut*Q1)*dt*( (v(i,j,k+1)-v(i,j,k)) / Dzs(k) - (v(i,j,k) - v(i,j,k-1)) / Dzs(k-1) ) / iDz(k)
end do
end do
end do
!$OMP END PARALLEL DO
!!! w_star calculation (z component) !!!
!$OMP PARALLEL DO PRIVATE(i,j,k)
do k=1,nz-1
do j=1,ny
do i=1,nx
u_tilde_z1 = 0.5 * (u(i,j,k+1)+u(i,j,k)) !1 for +(i or j)
u_tilde_z2 = 0.5 * (u(i-1,j,k+1)+u(i-1,j,k)) !2 for -(i or j)
v_tilde_z1 = 0.5 * (v(i,j,k)+v(i+1,j,k+1))
v_tilde_z2 = 0.5 * (v(i,j-1,k+1)+v(i,j-1,k))
w_tilde_z1 = 0.5 * (w(i,j,k+1)+w(i,j,k))
w_tilde_z2 = 0.5 * (w(i,j,k)+w(i,j,k-1))
if (u_tilde_z1 >= 0) then
we=w(i,j,k)
else
we=w(i+1,j,k)
end if
if (u_tilde_z2 >= 0) then
ww=w(i-1,j,k)
else
ww=w(i,j,k)
end if
if (v_tilde_z1 >= 0) then
wn=w(i,j,k)
else
wn=w(i,j+1,k)
end if
if (v_tilde_z2 >= 0) then
ws=w(i,j-1,k)
else
ws=w(i,j,k)
end if
if (w_tilde_z1 >= 0) then
wf=w(i,j,k)
else
wf=w(i,j,k+1)
end if
if (w_tilde_z2 >= 0) then
wb=w(i,j,k-1)
else
wb=w(i,j,k)
end if
if (Q1 == 1) then
delta = ( iDx(i)*iDy(j)*Dzs(k) ) ** (1./3)
nut = (Cs*delta)**2 * ( 0.5*(1/iDx(i)/iDx(i))*((u(i,j,k+1)+u(i,j,k))-(u(i-1,j,k+1)+u(i-1,j,k)))**2 + &
0.5*(1/iDy(j)/iDy(j))*((v(i,j,k+1)+v(i,j,k))-(v(i,j-1,k+1)+v(i,j-1,k)))**2 + &
0.5*(1/Dzs(k)/Dzs(k))*((w(i,j,k+1)+w(i,j,k))-(w(i,j,k)+w(i,j,k-1)))**2 + &
( 0.5*(1/iDy(j))*((u(i,j+1,k)+u(i,j,k))-(u(i,j,k)+u(i,j-1,k)))+ &
0.5*(1/iDx(i))*((v(i+1,j,k+1)+v(i,j-1,k))-(v(i-1,j,k+1)+v(i,j-1,k))) )**2 + &
( 0.5*(1/Dzs(k))*((u(i,j,k+1)+u(i-1,j,k+1))-(u(i,j,k)+u(i-1,j,k)))+ &
0.5*(1/iDx(i))*((w(i+1,j,k)+w(i,j,k))-(w(i-1,j,k)+w(i,j,k))) )**2 + &
( 0.5*(1/Dzs(k))*((v(i,j,k+1)+v(i,j-1,k+1))-(v(i,j,k)+v(i,j-1,k)))+ &
0.5*(1/iDy(j))*((w(i,j+1,k)+w(i,j,k))-(w(i,j-1,k)+w(i,j,k))) )**2 )**0.5
end if
w_star(i,j,k) = w(i,j,k)-dt*(u_tilde_z1*we-u_tilde_z2*ww) / iDx(i) &
-dt*(v_tilde_z1*wn-v_tilde_z2*ws) / iDy(j) &
-dt*(w_tilde_z1*wf-w_tilde_z2*wb) / Dzs(k) &
+(nu+nut*Q1)*dt*( ( w(i+1,j,k)-w(i,j,k) ) / Dxs(i) - ( w(i,j,k)-w(i-1,j,k) ) / Dxs(i-1) ) / iDx(i) &
+(nu+nut*Q1)*dt*( ( w(i,j+1,k)-w(i,j,k) ) / Dys(j) - ( w(i,j,k)-w(i,j-1,k) ) / Dys(j-1) ) / iDy(j) &
+(nu+nut*Q1)*dt*( ( w(i,j,k+1)-w(i,j,k) ) / iDz(k+1) - ( w(i,j,k)-w(i,j,k-1) ) / iDz(k) ) / Dzs(k)
end do
end do
end do
!$OMP END PARALLEL DO
end subroutine discretisation_upwind