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jmc |
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C $Header: $ |
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C $Name: $ |
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# include "GAD_OPTIONS.h" |
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SUBROUTINE GAD_PQM_P5E_Y(bi,bj,kk,ix, |
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& mask,fbar,edge,myThid) |
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C |================================================================| |
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C | PQM_P5E_Y: approximate edge values with degree-5 polynomials. | |
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C | Fixed grid-spacing variant in Y. | |
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C |================================================================| |
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implicit none |
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C =============================================== global variables |
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# include "SIZE.h" |
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# include "GRID.h" |
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# include "GAD.h" |
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C ====================================================== arguments |
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integer bi,bj,kk,ix |
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_RL mask(1-OLy:sNy+OLy) |
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_RL fbar(1-OLy:sNy+OLy) |
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_RL edge(1:2, |
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& 1-OLy:sNy+OLy) |
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integer myThid |
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C ====================================================== variables |
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integer iy |
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_RL mloc(-3:+2) |
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_RL floc(-3:+2) |
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_RL ftmp |
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C ==================== reconstruct 5th--order accurate edge values |
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do iy = 1-OLy+3, sNy+OLy-2 |
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C ================ mask local stencil: expand from centre outwards |
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mloc(-1) = mask(iy-1) |
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mloc(+0) = mask(iy+0) |
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floc(-1) = fbar(iy+0) |
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& + mloc(-1)*(fbar(iy-1)-fbar(iy+0)) |
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floc(+0) = fbar(iy-1) |
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& + mloc(+0)*(fbar(iy+0)-fbar(iy-1)) |
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mloc(-2) = mask(iy-2) * mloc(-1) |
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mloc(-3) = mask(iy-3) * mloc(-2) |
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ftmp = 2. _d 0 * floc(-1) - floc(+0) |
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floc(-2) = ftmp |
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& + mloc(-2)*(fbar(iy-2)-ftmp) |
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ftmp = 2. _d 0 * floc(-2) - floc(-1) |
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floc(-3) = ftmp |
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& + mloc(-3)*(fbar(iy-3)-ftmp) |
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mloc(+1) = mask(iy+1) * mloc(+0) |
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mloc(+2) = mask(iy+2) * mloc(+1) |
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ftmp = 2. _d 0 * floc(+0) - floc(-1) |
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floc(+1) = ftmp |
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& + mloc(+1)*(fbar(iy+1)-ftmp) |
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ftmp = 2. _d 0 * floc(+1) - floc(+0) |
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floc(+2) = ftmp |
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& + mloc(+2)*(fbar(iy+2)-ftmp) |
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C ================ centred, 5th-order interpolation for edge value |
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edge(1,iy) = |
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& +( 1. _d 0/60. _d 0)*(floc(-3)+floc(+2)) |
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& -( 8. _d 0/60. _d 0)*(floc(-2)+floc(+1)) |
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& +(37. _d 0/60. _d 0)*(floc(-1)+floc(+0)) |
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edge(2,iy) = ( |
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& -( 1. _d 0/90. _d 0)*(floc(-3)-floc(+2)) |
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& +( 5. _d 0/36. _d 0)*(floc(-2)-floc(+1)) |
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& -(49. _d 0/36. _d 0)*(floc(-1)-floc(+0)) |
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& ) * recip_dyC(ix,iy,bi,bj) |
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end do |
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return |
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c end subroutine GAD_PQM_P5E_Y |
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end |
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