dyn3d/Dissipation/gradiv2.f

module gradiv2_m

  IMPLICIT NONE

contains

  SUBROUTINE gradiv2(xcov, ycov, ld, gdx, gdy, cdivu)

    ! From LMDZ4/libf/dyn3d/gradiv2.F, version 1.1.1.1 2004/05/19 12:53:07
    ! P. Le Van
    ! Calcul du gradient de la divergence du vecteur v.

    USE comgeom, ONLY: cuvscvgam1, cvuscugam1, unsair_gam1, unsapolnga1, &
         unsapolsga1
    USE dimens_m, ONLY: iim, jjm
    use divergf_m, only: divergf
    USE filtreg_m, ONLY: filtreg
    use grad_m, only: grad
    use laplacien_m, only: laplacien
    use nr_util, only: assert_eq, assert

    ! Composantes covariantes de v :
    REAL, intent(in):: xcov(:, :, :) ! (iim + 1, jjm + 1, klevel)
    REAL, intent(in):: ycov(:, :, :) ! (iim + 1, jjm, klevel)

    integer, intent(in):: ld
    REAL, intent(out):: gdx(:, :, :) ! (iim + 1, jjm + 1, klevel)
    REAL, intent(out):: gdy(:, :, :) ! (iim + 1, jjm, klevel)
    real, intent(in):: cdivu

    ! Variables locales :
    REAL nugrads, div(iim + 1, jjm + 1, size(xcov, 3))
    INTEGER iter, klevel

    !--------------------------------------------------------------

    call assert((/size(xcov, 1), size(ycov, 1), size(gdx, 1), size(gdy, 1)/) &
         == iim + 1, "gradiv2 iim")
    call assert((/size(xcov, 2) - 1, size(ycov, 2), size(gdx, 2) - 1, &
         size(gdy, 2)/) == jjm, "gradiv2 iim")
    klevel = assert_eq(size(xcov, 3), size(ycov, 3), size(gdx, 3), &
         size(gdy, 3), "gradiv2 klevel")

    CALL divergf(klevel, xcov, ycov, div)

    IF (ld > 1) THEN
       CALL laplacien(klevel, div)

       ! Itération de l'opérateur laplacien_gam
       DO iter = 1, ld - 2
          CALL laplacien_gam(klevel, cuvscvgam1, cvuscugam1, unsair_gam1, &
               unsapolnga1, unsapolsga1, div, div)
       END DO
    ENDIF

    CALL filtreg(div, direct = .true., intensive = .true.)
    CALL grad(klevel, div, gdx, gdy)
    nugrads = (-1.)**ld * cdivu

    gdx = gdx * nugrads
    gdy = gdy * nugrads

  END SUBROUTINE gradiv2

end module gradiv2_m
1	module gradiv2_m
2
3	IMPLICIT NONE
4
5	contains
6
7	SUBROUTINE gradiv2(xcov, ycov, ld, gdx, gdy, cdivu)
8
9	! From LMDZ4/libf/dyn3d/gradiv2.F, version 1.1.1.1 2004/05/19 12:53:07
10	! P. Le Van
11	! Calcul du gradient de la divergence du vecteur v.
12
13	USE comgeom, ONLY: cuvscvgam1, cvuscugam1, unsair_gam1, unsapolnga1, &
14	unsapolsga1
15	USE dimens_m, ONLY: iim, jjm
16	use divergf_m, only: divergf
17	USE filtreg_m, ONLY: filtreg
18	use grad_m, only: grad
19	use laplacien_m, only: laplacien
20	use nr_util, only: assert_eq, assert
21
22	! Composantes covariantes de v :
23	REAL, intent(in):: xcov(:, :, :) ! (iim + 1, jjm + 1, klevel)
24	REAL, intent(in):: ycov(:, :, :) ! (iim + 1, jjm, klevel)
25
26	integer, intent(in):: ld
27	REAL, intent(out):: gdx(:, :, :) ! (iim + 1, jjm + 1, klevel)
28	REAL, intent(out):: gdy(:, :, :) ! (iim + 1, jjm, klevel)
29	real, intent(in):: cdivu
30
31	! Variables locales :
32	REAL nugrads, div(iim + 1, jjm + 1, size(xcov, 3))
33	INTEGER iter, klevel
34
35	!--------------------------------------------------------------
36
37	call assert((/size(xcov, 1), size(ycov, 1), size(gdx, 1), size(gdy, 1)/) &
38	== iim + 1, "gradiv2 iim")
39	call assert((/size(xcov, 2) - 1, size(ycov, 2), size(gdx, 2) - 1, &
40	size(gdy, 2)/) == jjm, "gradiv2 iim")
41	klevel = assert_eq(size(xcov, 3), size(ycov, 3), size(gdx, 3), &
42	size(gdy, 3), "gradiv2 klevel")
43
44	CALL divergf(klevel, xcov, ycov, div)
45
46	IF (ld > 1) THEN
47	CALL laplacien(klevel, div)
48
49	! Itération de l'opérateur laplacien_gam
50	DO iter = 1, ld - 2
51	CALL laplacien_gam(klevel, cuvscvgam1, cvuscugam1, unsair_gam1, &
52	unsapolnga1, unsapolsga1, div, div)
53	END DO
54	ENDIF
55
56	CALL filtreg(div, direct = .true., intensive = .true.)
57	CALL grad(klevel, div, gdx, gdy)
58	nugrads = (-1.)*ld cdivu
59
60	gdx = gdx * nugrads
61	gdy = gdy * nugrads
62
63	END SUBROUTINE gradiv2
64
65	end module gradiv2_m