| |
| c--------------------------------------------------------------------- |
| c--------------------------------------------------------------------- |
| |
| subroutine lhsz(c) |
| |
| c--------------------------------------------------------------------- |
| c--------------------------------------------------------------------- |
| |
| c--------------------------------------------------------------------- |
| c This function computes the left hand side for the three z-factors |
| c--------------------------------------------------------------------- |
| |
| include 'header.h' |
| |
| double precision ru1 |
| integer i, j, k, c |
| |
| c--------------------------------------------------------------------- |
| c treat only cell c |
| c--------------------------------------------------------------------- |
| |
| c--------------------------------------------------------------------- |
| c first fill the lhs for the u-eigenvalue |
| c--------------------------------------------------------------------- |
| do j = start(2,c), cell_size(2,c)-end(2,c)-1 |
| do i = start(1,c), cell_size(1,c)-end(1,c)-1 |
| |
| do k = start(3,c)-1, cell_size(3,c)-end(3,c) |
| ru1 = c3c4*rho_i(i,j,k,c) |
| cv(k) = ws(i,j,k,c) |
| rhos(k) = dmax1(dz4 + con43 * ru1, |
| > dz5 + c1c5 * ru1, |
| > dzmax + ru1, |
| > dz1) |
| end do |
| |
| do k = start(3,c), cell_size(3,c)-end(3,c)-1 |
| lhs(i,j,k,1,c) = 0.0d0 |
| lhs(i,j,k,2,c) = -dttz2 * cv(k-1) - dttz1 * rhos(k-1) |
| lhs(i,j,k,3,c) = 1.0 + c2dttz1 * rhos(k) |
| lhs(i,j,k,4,c) = dttz2 * cv(k+1) - dttz1 * rhos(k+1) |
| lhs(i,j,k,5,c) = 0.0d0 |
| end do |
| end do |
| end do |
| |
| c--------------------------------------------------------------------- |
| c add fourth order dissipation |
| c--------------------------------------------------------------------- |
| if (start(3,c) .gt. 0) then |
| k = 1 |
| do j = start(2,c), cell_size(2,c)-end(2,c)-1 |
| do i = start(1,c), cell_size(1,c)-end(1,c)-1 |
| lhs(i,j,k,3,c) = lhs(i,j,k,3,c) + comz5 |
| lhs(i,j,k,4,c) = lhs(i,j,k,4,c) - comz4 |
| lhs(i,j,k,5,c) = lhs(i,j,k,5,c) + comz1 |
| |
| lhs(i,j,k+1,2,c) = lhs(i,j,k+1,2,c) - comz4 |
| lhs(i,j,k+1,3,c) = lhs(i,j,k+1,3,c) + comz6 |
| lhs(i,j,k+1,4,c) = lhs(i,j,k+1,4,c) - comz4 |
| lhs(i,j,k+1,5,c) = lhs(i,j,k+1,5,c) + comz1 |
| end do |
| end do |
| endif |
| |
| do k = 3*start(3,c), cell_size(3,c)-3*end(3,c)-1 |
| do j = start(2,c), cell_size(2,c)-end(2,c)-1 |
| do i = start(1,c), cell_size(1,c)-end(1,c)-1 |
| lhs(i,j,k,1,c) = lhs(i,j,k,1,c) + comz1 |
| lhs(i,j,k,2,c) = lhs(i,j,k,2,c) - comz4 |
| lhs(i,j,k,3,c) = lhs(i,j,k,3,c) + comz6 |
| lhs(i,j,k,4,c) = lhs(i,j,k,4,c) - comz4 |
| lhs(i,j,k,5,c) = lhs(i,j,k,5,c) + comz1 |
| end do |
| end do |
| end do |
| |
| if (end(3,c) .gt. 0) then |
| k = cell_size(3,c)-3 |
| do j = start(2,c), cell_size(2,c)-end(2,c)-1 |
| do i = start(1,c), cell_size(1,c)-end(1,c)-1 |
| lhs(i,j,k,1,c) = lhs(i,j,k,1,c) + comz1 |
| lhs(i,j,k,2,c) = lhs(i,j,k,2,c) - comz4 |
| lhs(i,j,k,3,c) = lhs(i,j,k,3,c) + comz6 |
| lhs(i,j,k,4,c) = lhs(i,j,k,4,c) - comz4 |
| |
| lhs(i,j,k+1,1,c) = lhs(i,j,k+1,1,c) + comz1 |
| lhs(i,j,k+1,2,c) = lhs(i,j,k+1,2,c) - comz4 |
| lhs(i,j,k+1,3,c) = lhs(i,j,k+1,3,c) + comz5 |
| end do |
| end do |
| endif |
| |
| |
| c--------------------------------------------------------------------- |
| c subsequently, fill the other factors (u+c), (u-c) |
| c--------------------------------------------------------------------- |
| do k = start(3,c), cell_size(3,c)-end(3,c)-1 |
| do j = start(2,c), cell_size(2,c)-end(2,c)-1 |
| do i = start(1,c), cell_size(1,c)-end(1,c)-1 |
| lhs(i,j,k,1+5,c) = lhs(i,j,k,1,c) |
| lhs(i,j,k,2+5,c) = lhs(i,j,k,2,c) - |
| > dttz2 * speed(i,j,k-1,c) |
| lhs(i,j,k,3+5,c) = lhs(i,j,k,3,c) |
| lhs(i,j,k,4+5,c) = lhs(i,j,k,4,c) + |
| > dttz2 * speed(i,j,k+1,c) |
| lhs(i,j,k,5+5,c) = lhs(i,j,k,5,c) |
| lhs(i,j,k,1+10,c) = lhs(i,j,k,1,c) |
| lhs(i,j,k,2+10,c) = lhs(i,j,k,2,c) + |
| > dttz2 * speed(i,j,k-1,c) |
| lhs(i,j,k,3+10,c) = lhs(i,j,k,3,c) |
| lhs(i,j,k,4+10,c) = lhs(i,j,k,4,c) - |
| > dttz2 * speed(i,j,k+1,c) |
| lhs(i,j,k,5+10,c) = lhs(i,j,k,5,c) |
| end do |
| end do |
| end do |
| |
| return |
| end |
| |
| |
