/[lmdze]/trunk/dyn3d/invert_zoom_x.f
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revision 146 by guez, Tue Jun 16 17:27:33 2015 UTC revision 148 by guez, Wed Jun 17 16:40:24 2015 UTC
# Line 6  module invert_zoom_x_m Line 6  module invert_zoom_x_m
6    
7  contains  contains
8    
9    subroutine invert_zoom_x(xf, xtild, G, xlon, xprimm, xuv)    subroutine invert_zoom_x(xf, xtild, G, xlon, xprim, xuv)
10    
11      use coefpoly_m, only: coefpoly      use coefpoly_m, only: coefpoly
12      USE dimens_m, ONLY: iim      USE dimens_m, ONLY: iim
# Line 16  contains Line 16  contains
16    
17      DOUBLE PRECISION, intent(in):: Xf(0:), xtild(0:), G(0:) ! (0:nmax)      DOUBLE PRECISION, intent(in):: Xf(0:), xtild(0:), G(0:) ! (0:nmax)
18    
19      real, intent(out):: xlon(:), xprimm(:) ! (iim)      real, intent(out):: xlon(:), xprim(:) ! (iim)
20    
21      DOUBLE PRECISION, intent(in):: xuv      DOUBLE PRECISION, intent(in):: xuv
22      ! between - 0.25 and 0.5      ! between - 0.25 and 0.5
# Line 24  contains Line 24  contains
24      ! 0.5 si calcul aux points U      ! 0.5 si calcul aux points U
25    
26      ! Local:      ! Local:
27      DOUBLE PRECISION xo1, Xfi, abs_xfi, a0, a1, a2, a3, Xf1, Xprimin      DOUBLE PRECISION Y, abs_y, a0, a1, a2, a3
28      integer i, it, iter      integer i, it, iter
29      DOUBLE PRECISION, parameter:: my_eps = 1d-6      real, parameter:: my_eps = 1e-6
30    
31      DOUBLE PRECISION xxprim(iim), xvrai(iim)      real xo1, Xf1
32      ! intermediary variables because xlon and xprimm are simple precision      real xvrai(iim), Gvrai(iim)
33        ! intermediary variables because xlon and xprim are simple precision
34    
35      !------------------------------------------------------------------      !------------------------------------------------------------------
36    
37      it = 0 ! initial guess      it = 0 ! initial guess
38    
39      DO i = 1, iim      DO i = 1, iim
40         Xfi = - pi_d + (i + xuv - 0.75d0) * twopi_d / iim         Y = - pi_d + (i + xuv - 0.75d0) * twopi_d / iim
41         ! - pi <= xfi < pi         ! - pi <= y < pi
42         abs_xfi = abs(xfi)         abs_y = abs(y)
43    
44         call hunt(xf, abs_xfi, it, my_lbound = 0)         call hunt(xf, abs_y, it, my_lbound = 0)
45         ! {0 <= it <= nmax - 1}         ! {0 <= it <= nmax - 1}
46    
47         ! Calcul de xvrai(i) et xxprim(i)         ! Calcul de xvrai(i) et Gvrai(i)
48    
49         CALL coefpoly(Xf(it), Xf(it + 1), G(it), G(it + 1), xtild(it), &         CALL coefpoly(Xf(it), Xf(it + 1), G(it), G(it + 1), xtild(it), &
50              xtild(it + 1), a0, a1, a2, a3)              xtild(it + 1), a0, a1, a2, a3)
51         xvrai(i) = xtild(it)         xvrai(i) = xtild(it)
52         Xf1 = Xf(it)         Xf1 = Xf(it)
53         Xprimin = G(it)         Gvrai(i) = G(it)
54         xo1 = xvrai(i)         xo1 = xvrai(i)
55         iter = 1         iter = 1
56    
57         do         do
58            xvrai(i) = xvrai(i) - (Xf1 - abs_xfi) / Xprimin            xvrai(i) = xvrai(i) - (Xf1 - abs_y) / Gvrai(i)
59            IF (ABS(xvrai(i) - xo1) <= my_eps .or. iter == 300) exit            IF (ABS(xvrai(i) - xo1) <= my_eps .or. iter == 300) exit
60            xo1 = xvrai(i)            xo1 = xvrai(i)
61            Xf1 = a0 + xvrai(i) * (a1 + xvrai(i) * (a2 + xvrai(i) * a3))            Xf1 = a0 + xvrai(i) * (a1 + xvrai(i) * (a2 + xvrai(i) * a3))
62            Xprimin = a1 + xvrai(i) * (2d0 * a2 + xvrai(i) * 3d0 * a3)            Gvrai(i) = a1 + xvrai(i) * (2d0 * a2 + xvrai(i) * 3d0 * a3)
63         end DO         end DO
64    
65         if (ABS(xvrai(i) - xo1) > my_eps) then         if (ABS(xvrai(i) - xo1) > my_eps) then
66            ! iter == 300            ! iter == 300
67            print *, 'Pas de solution.'            print *, 'Pas de solution.'
68            print *, i, abs_xfi            print *, i, abs_y
69            STOP 1            STOP 1
70         end if         end if
71    
72         if (xfi < 0) xvrai(i) = - xvrai(i)         if (y < 0d0) xvrai(i) = - xvrai(i)
        xxprim(i) = twopi_d / (iim * Xprimin)  
73      end DO      end DO
74    
75      DO i = 1, iim -1      DO i = 1, iim -1
# Line 80  contains Line 80  contains
80      END DO      END DO
81    
82      xlon = xvrai + clon      xlon = xvrai + clon
83      xprimm = xxprim      xprim = twopi_d / (iim * Gvrai)
84    
85    end subroutine invert_zoom_x    end subroutine invert_zoom_x
86    
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