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C $Header: $ |
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C $Name: $ |
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|
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# include "GAD_OPTIONS.h" |
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|
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SUBROUTINE GAD_PPM_HAT_X(bi,bj,kk,iy, |
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& method,mask,fbar,edge, |
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& ohat,fhat,myThid) |
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C |================================================================| |
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C | PPM_HAT_X: reconstruct grid-cell PPM polynomials. | |
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C |================================================================| |
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|
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implicit none |
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|
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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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|
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C ====================================================== arguments |
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C bi,bj :: tile indexing. |
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C kk :: r-indexing. |
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C iy :: y-indexing. |
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C method :: advection scheme. |
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C mask :: row of cell-wise masking values. |
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C fbar :: row of cell-wise values. |
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C edge :: row of edge-wise values. |
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C ohat :: row of oscl. coeff. |
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C - OHAT(1,:) = D^1F/DS^1. |
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C - OHAT(2,:) = D^2F/DS^2. |
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C fhat :: row of poly. coeff. |
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C - FHAT(:,I) = PPM coeff. |
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C myThid :: thread number. |
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C ================================================================ |
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integer bi,bj,kk,iy |
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integer method |
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_RL mask(1-OLx:sNx+OLx) |
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_RL fbar(1-OLx:sNx+OLx) |
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_RL edge(1-OLx:sNx+OLx) |
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_RL ohat(1:2, |
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& 1-OLx:sNx+OLx) |
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_RL fhat(1:3, |
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& 1-OLx:sNx+OLx) |
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integer myThid |
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|
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C ====================================================== variables |
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C ii,ix :: local x-indexing. |
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C ff00 :: centre-biased cell mean. |
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C ffll,ffrr :: left-, and right-biased cell values. |
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C fell,ferr :: left-, and right-biased edge values. |
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C dfds :: linear slope estimates. |
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C uhat :: "NULL" limited poly. coeff. |
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C lhat :: "MONO" limited poly. coeff. |
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C scal :: "WENO" weights. |
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C fmag,fdel :: local perturbation indicators. |
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C ================================================================ |
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integer ii,ix |
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_RL ff00,ffll,ffrr |
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_RL fell,ferr |
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_RL dfds(-1:+1) |
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_RL uhat(+1:+3) |
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_RL lhat(+1:+3) |
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_RL scal(+1:+2) |
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_RL fmag,fdel |
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integer mono |
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|
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do ix = 1-OLx+2, sNx+OLx-2 |
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|
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C =============================== assemble cell mean + edge values |
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ff00 = fbar(ix+0) |
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ffll = ff00 |
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& + mask(ix-1)*(fbar(ix-1)-ff00) |
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ffrr = ff00 |
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& + mask(ix+1)*(fbar(ix+1)-ff00) |
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|
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fell = edge(ix-0) |
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ferr = edge(ix+1) |
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|
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c select case(method) |
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c case(ENUM_PPM_NULL_LIMIT) |
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if ( method.eq.ENUM_PPM_NULL_LIMIT ) then |
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C =============================== "NULL" limited grid-cell profile |
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CALL GAD_PPM_FUN_NULL ( ff00,fell,ferr, |
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& lhat,mono) |
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|
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c case(ENUM_PPM_MONO_LIMIT) |
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elseif ( method.eq.ENUM_PPM_MONO_LIMIT ) then |
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C =============================== "MONO" limited grid-cell profile |
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CALL GAD_PLM_FUN_U(ffll,ff00,ffrr,dfds) |
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|
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CALL GAD_PPM_FUN_MONO ( ff00,ffll,ffrr, |
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& fell,ferr,dfds,lhat,mono) |
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|
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c case(ENUM_PPM_WENO_LIMIT) |
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elseif ( method.eq.ENUM_PPM_WENO_LIMIT ) then |
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C =============================== "WENO" limited grid-cell profile |
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CALL GAD_PLM_FUN_U(ffll,ff00,ffrr,dfds) |
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|
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CALL GAD_PPM_FUN_NULL ( ff00,fell,ferr, |
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& uhat,mono) |
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|
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CALL GAD_PPM_FUN_MONO ( ff00,ffll,ffrr, |
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& fell,ferr,dfds,lhat,mono) |
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|
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if ( mono .gt. 0) then |
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|
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C =============================== only apply WENO if it is worth it |
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fdel = abs(ffrr-ff00)+abs(ff00-ffll) |
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fmag = abs(ffll)+abs(ff00)+abs(ffrr) |
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|
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if (fdel .gt. 1. _d -6 * fmag) then |
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|
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C =============================== calc. WENO oscillation weighting |
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CALL GAD_OSC_MUL_X(ix,+2,mask, |
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& ohat,scal) |
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|
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do ii = +1, +3 |
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C =============================== blend limited/un-limited profile |
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lhat(ii) = scal(1) * uhat(ii) |
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& + scal(2) * lhat(ii) |
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end do |
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|
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end if |
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|
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end if |
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|
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c end select |
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endif |
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|
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do ii = +1, +3 |
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C =============================== copy polynomial onto output data |
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fhat(ii,ix) = lhat(ii) |
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end do |
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|
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end do |
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|
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return |
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|
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c end subroutine GAD_PPM_HAT_X |
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end |
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