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gad_pqm_p5e_y.F
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gad_pqm_p5e_y.F
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# include "GAD_OPTIONS.h"
SUBROUTINE GAD_PQM_P5E_Y(bi,bj,kk,ix,
& mask,fbar,edge,myThid)
C |================================================================|
C | PQM_P5E_Y: approximate edge values with degree-5 polynomials. |
C | Fixed grid-spacing variant in Y. |
C |================================================================|
implicit none
C =============================================== global variables
# include "SIZE.h"
# include "GRID.h"
# include "GAD.h"
C ====================================================== arguments
integer bi,bj,kk,ix
_RL mask(1-OLy:sNy+OLy)
_RL fbar(1-OLy:sNy+OLy)
_RL edge(1:2,
& 1-OLy:sNy+OLy)
integer myThid
C ====================================================== variables
integer iy
_RL mloc(-3:+2)
_RL floc(-3:+2)
_RL ftmp
C ==================== reconstruct 5th--order accurate edge values
do iy = 1-OLy+3, sNy+OLy-2
C ================ mask local stencil: expand from centre outwards
mloc(-1) = mask(iy-1)
mloc(+0) = mask(iy+0)
floc(-1) = fbar(iy+0)
& + mloc(-1)*(fbar(iy-1)-fbar(iy+0))
floc(+0) = fbar(iy-1)
& + mloc(+0)*(fbar(iy+0)-fbar(iy-1))
mloc(-2) = mask(iy-2) * mloc(-1)
mloc(-3) = mask(iy-3) * mloc(-2)
ftmp = 2. _d 0 * floc(-1) - floc(+0)
floc(-2) = ftmp
& + mloc(-2)*(fbar(iy-2)-ftmp)
ftmp = 2. _d 0 * floc(-2) - floc(-1)
floc(-3) = ftmp
& + mloc(-3)*(fbar(iy-3)-ftmp)
mloc(+1) = mask(iy+1) * mloc(+0)
mloc(+2) = mask(iy+2) * mloc(+1)
ftmp = 2. _d 0 * floc(+0) - floc(-1)
floc(+1) = ftmp
& + mloc(+1)*(fbar(iy+1)-ftmp)
ftmp = 2. _d 0 * floc(+1) - floc(+0)
floc(+2) = ftmp
& + mloc(+2)*(fbar(iy+2)-ftmp)
C ================ centred, 5th-order interpolation for edge value
edge(1,iy) =
& +( 1. _d 0/60. _d 0)*(floc(-3)+floc(+2))
& -( 8. _d 0/60. _d 0)*(floc(-2)+floc(+1))
& +(37. _d 0/60. _d 0)*(floc(-1)+floc(+0))
edge(2,iy) = (
& -( 1. _d 0/90. _d 0)*(floc(-3)-floc(+2))
& +( 5. _d 0/36. _d 0)*(floc(-2)-floc(+1))
& -(49. _d 0/36. _d 0)*(floc(-1)-floc(+0))
& ) * recip_dyC(ix,iy,bi,bj)
end do
return
c end subroutine GAD_PQM_P5E_Y
end