| |
| c--------------------------------------------------------------------- |
| c--------------------------------------------------------------------- |
| |
| subroutine tzetar(c) |
| |
| c--------------------------------------------------------------------- |
| c--------------------------------------------------------------------- |
| |
| c--------------------------------------------------------------------- |
| c block-diagonal matrix-vector multiplication |
| c--------------------------------------------------------------------- |
| |
| include 'header.h' |
| |
| integer i, j, k, c |
| double precision t1, t2, t3, ac, xvel, yvel, zvel, r1, r2, r3, |
| > r4, r5, btuz, acinv, ac2u, uzik1 |
| |
| c--------------------------------------------------------------------- |
| c treat only one cell |
| 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 |
| |
| xvel = us(i,j,k,c) |
| yvel = vs(i,j,k,c) |
| zvel = ws(i,j,k,c) |
| ac = speed(i,j,k,c) |
| acinv = ainv(i,j,k,c) |
| |
| ac2u = ac*ac |
| |
| r1 = rhs(i,j,k,1,c) |
| r2 = rhs(i,j,k,2,c) |
| r3 = rhs(i,j,k,3,c) |
| r4 = rhs(i,j,k,4,c) |
| r5 = rhs(i,j,k,5,c) |
| |
| uzik1 = u(i,j,k,1,c) |
| btuz = bt * uzik1 |
| |
| t1 = btuz*acinv * (r4 + r5) |
| t2 = r3 + t1 |
| t3 = btuz * (r4 - r5) |
| |
| rhs(i,j,k,1,c) = t2 |
| rhs(i,j,k,2,c) = -uzik1*r2 + xvel*t2 |
| rhs(i,j,k,3,c) = uzik1*r1 + yvel*t2 |
| rhs(i,j,k,4,c) = zvel*t2 + t3 |
| rhs(i,j,k,5,c) = uzik1*(-xvel*r2 + yvel*r1) + |
| > qs(i,j,k,c)*t2 + c2iv*ac2u*t1 + zvel*t3 |
| |
| end do |
| end do |
| end do |
| |
| return |
| end |
