[e200b7a] | 1 | subroutine shift_field(field,nxf,nyf,nzfmax,nzf,nmax,n) |
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| 2 | ! i/o i i i i i i |
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| 3 | !***************************************************************************** |
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| 4 | ! * |
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| 5 | ! This subroutine shifts global fields by nxshift grid cells, in order to * |
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| 6 | ! facilitate all sorts of nested wind fields, or output grids, which, * |
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| 7 | ! without shifting, would overlap with the domain "boundary". * |
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| 8 | ! * |
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| 9 | ! Author: A. Stohl * |
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| 10 | ! * |
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| 11 | ! 3 July 2002 * |
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| 12 | ! * |
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| 13 | !***************************************************************************** |
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| 14 | ! * |
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| 15 | ! Variables: * |
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| 16 | ! * |
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| 17 | ! Constants: * |
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| 18 | ! * |
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| 19 | !***************************************************************************** |
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| 20 | |
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| 21 | use par_mod |
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| 22 | |
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| 23 | implicit none |
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| 24 | |
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| 25 | integer :: nxf,nyf,nzf,n,ix,jy,kz,ixs,nzfmax,nmax |
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| 26 | real :: field(0:nxmax-1,0:nymax-1,nzfmax,nmax),xshiftaux(0:nxmax-1) |
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| 27 | |
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| 28 | ! Loop over y and z |
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| 29 | !****************** |
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| 30 | |
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| 31 | do kz=1,nzf |
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| 32 | do jy=0,nyf-1 |
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| 33 | |
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| 34 | ! Shift the data |
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| 35 | !*************** |
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| 36 | |
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| 37 | if (nxshift.ne.0) then |
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| 38 | do ix=0,nxf-1 |
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| 39 | if (ix.ge.nxshift) then |
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| 40 | ixs=ix-nxshift |
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| 41 | else |
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| 42 | ixs=nxf-nxshift+ix |
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| 43 | endif |
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| 44 | xshiftaux(ixs)=field(ix,jy,kz,n) |
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| 45 | end do |
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| 46 | do ix=0,nxf-1 |
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| 47 | field(ix,jy,kz,n)=xshiftaux(ix) |
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| 48 | end do |
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| 49 | endif |
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| 50 | |
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| 51 | ! Repeat the westernmost grid cells at the easternmost domain "boundary" |
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| 52 | !*********************************************************************** |
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| 53 | |
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| 54 | field(nxf,jy,kz,n)=field(0,jy,kz,n) |
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| 55 | end do |
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| 56 | end do |
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| 57 | |
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| 58 | end subroutine shift_field |
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