[524] | 1 | ! |
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[1403] | 2 | ! $Id: friction.F 1454 2010-11-18 12:01:24Z ymeurdesoif $ |
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[524] | 3 | ! |
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| 4 | c======================================================================= |
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| 5 | SUBROUTINE friction(ucov,vcov,pdt) |
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[1403] | 6 | |
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| 7 | USE control_mod |
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[1454] | 8 | #ifdef CPP_IOIPSL |
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| 9 | USE IOIPSL |
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| 10 | #else |
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| 11 | ! if not using IOIPSL, we still need to use (a local version of) getin |
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| 12 | USE ioipsl_getincom |
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| 13 | #endif |
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| 14 | |
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[524] | 15 | IMPLICIT NONE |
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| 16 | |
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[1454] | 17 | !======================================================================= |
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| 18 | ! |
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| 19 | ! Friction for the Newtonian case: |
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| 20 | ! -------------------------------- |
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| 21 | ! 2 possibilities (depending on flag 'friction_type' |
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| 22 | ! friction_type=0 : A friction that is only applied to the lowermost |
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| 23 | ! atmospheric layer |
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| 24 | ! friction_type=1 : Friction applied on all atmospheric layer (but |
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| 25 | ! (default) with stronger magnitude near the surface; see |
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| 26 | ! iniacademic.F) |
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| 27 | !======================================================================= |
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[524] | 28 | |
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| 29 | #include "dimensions.h" |
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| 30 | #include "paramet.h" |
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| 31 | #include "comgeom2.h" |
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| 32 | #include "comconst.h" |
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[1454] | 33 | #include "iniprint.h" |
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| 34 | #include "academic.h" |
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[524] | 35 | |
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[1454] | 36 | ! arguments: |
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| 37 | REAL,INTENT(out) :: ucov( iip1,jjp1,llm ) |
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| 38 | REAL,INTENT(out) :: vcov( iip1,jjm,llm ) |
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| 39 | REAL,INTENT(in) :: pdt ! time step |
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| 40 | |
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| 41 | ! local variables: |
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| 42 | |
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[524] | 43 | REAL modv(iip1,jjp1),zco,zsi |
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| 44 | REAL vpn,vps,upoln,upols,vpols,vpoln |
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| 45 | REAL u2(iip1,jjp1),v2(iip1,jjm) |
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[1454] | 46 | INTEGER i,j,l |
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| 47 | REAL,PARAMETER :: cfric=1.e-5 |
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| 48 | LOGICAL,SAVE :: firstcall=.true. |
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| 49 | INTEGER,SAVE :: friction_type=1 |
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| 50 | CHARACTER(len=20) :: modname="friction" |
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| 51 | CHARACTER(len=80) :: abort_message |
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| 52 | |
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| 53 | IF (firstcall) THEN |
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| 54 | ! set friction type |
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| 55 | call getin("friction_type",friction_type) |
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| 56 | if ((friction_type.lt.0).or.(friction_type.gt.1)) then |
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| 57 | abort_message="wrong friction type" |
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| 58 | write(lunout,*)'Friction: wrong friction type',friction_type |
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| 59 | call abort_gcm(modname,abort_message,42) |
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| 60 | endif |
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| 61 | firstcall=.false. |
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| 62 | ENDIF |
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[524] | 63 | |
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[1454] | 64 | if (friction_type.eq.0) then |
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[524] | 65 | c calcul des composantes au carre du vent naturel |
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| 66 | do j=1,jjp1 |
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| 67 | do i=1,iip1 |
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| 68 | u2(i,j)=ucov(i,j,1)*ucov(i,j,1)*unscu2(i,j) |
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| 69 | enddo |
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| 70 | enddo |
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| 71 | do j=1,jjm |
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| 72 | do i=1,iip1 |
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| 73 | v2(i,j)=vcov(i,j,1)*vcov(i,j,1)*unscv2(i,j) |
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| 74 | enddo |
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| 75 | enddo |
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| 76 | |
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| 77 | c calcul du module de V en dehors des poles |
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| 78 | do j=2,jjm |
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| 79 | do i=2,iip1 |
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| 80 | modv(i,j)=sqrt(0.5*(u2(i-1,j)+u2(i,j)+v2(i,j-1)+v2(i,j))) |
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| 81 | enddo |
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| 82 | modv(1,j)=modv(iip1,j) |
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| 83 | enddo |
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| 84 | |
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| 85 | c les deux composantes du vent au pole sont obtenues comme |
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| 86 | c premiers modes de fourier de v pres du pole |
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| 87 | upoln=0. |
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| 88 | vpoln=0. |
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| 89 | upols=0. |
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| 90 | vpols=0. |
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| 91 | do i=2,iip1 |
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| 92 | zco=cos(rlonv(i))*(rlonu(i)-rlonu(i-1)) |
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| 93 | zsi=sin(rlonv(i))*(rlonu(i)-rlonu(i-1)) |
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| 94 | vpn=vcov(i,1,1)/cv(i,1) |
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| 95 | vps=vcov(i,jjm,1)/cv(i,jjm) |
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| 96 | upoln=upoln+zco*vpn |
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| 97 | vpoln=vpoln+zsi*vpn |
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| 98 | upols=upols+zco*vps |
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| 99 | vpols=vpols+zsi*vps |
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| 100 | enddo |
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| 101 | vpn=sqrt(upoln*upoln+vpoln*vpoln)/pi |
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| 102 | vps=sqrt(upols*upols+vpols*vpols)/pi |
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| 103 | do i=1,iip1 |
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| 104 | c modv(i,1)=vpn |
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| 105 | c modv(i,jjp1)=vps |
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| 106 | modv(i,1)=modv(i,2) |
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| 107 | modv(i,jjp1)=modv(i,jjm) |
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| 108 | enddo |
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| 109 | |
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| 110 | c calcul du frottement au sol. |
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| 111 | do j=2,jjm |
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| 112 | do i=1,iim |
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| 113 | ucov(i,j,1)=ucov(i,j,1) |
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| 114 | s -cfric*pdt*0.5*(modv(i+1,j)+modv(i,j))*ucov(i,j,1) |
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| 115 | enddo |
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| 116 | ucov(iip1,j,1)=ucov(1,j,1) |
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| 117 | enddo |
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| 118 | do j=1,jjm |
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| 119 | do i=1,iip1 |
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| 120 | vcov(i,j,1)=vcov(i,j,1) |
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| 121 | s -cfric*pdt*0.5*(modv(i,j+1)+modv(i,j))*vcov(i,j,1) |
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| 122 | enddo |
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| 123 | vcov(iip1,j,1)=vcov(1,j,1) |
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| 124 | enddo |
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[1454] | 125 | endif ! of if (friction_type.eq.0) |
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[524] | 126 | |
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[1454] | 127 | if (friction_type.eq.1) then |
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| 128 | do l=1,llm |
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| 129 | ucov(:,:,l)=ucov(:,:,l)*(1.-pdt*kfrict(l)) |
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| 130 | vcov(:,:,l)=vcov(:,:,l)*(1.-pdt*kfrict(l)) |
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| 131 | enddo |
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| 132 | endif |
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| 133 | |
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[524] | 134 | RETURN |
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| 135 | END |
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| 136 | |
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