/[MITgcm]/MITgcm/pkg/flt/flt_runga2.F
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Revision 1.1 - (hide annotations) (download)
Thu Sep 13 17:43:56 2001 UTC (22 years, 8 months ago) by adcroft
Branch: MAIN
CVS Tags: checkpoint46n_post, checkpoint51k_post, checkpoint47e_post, checkpoint52l_pre, checkpoint44e_post, hrcube4, hrcube5, checkpoint46l_post, checkpoint46g_pre, checkpoint47c_post, release1_p13_pre, checkpoint50c_post, checkpoint46f_post, checkpoint52d_pre, checkpoint48e_post, checkpoint50c_pre, checkpoint44f_post, checkpoint46b_post, checkpoint52j_pre, checkpoint43a-release1mods, checkpoint51o_pre, ecco_c50_e32, ecco_c50_e33, ecco_c50_e30, ecco_c50_e31, release1_p13, checkpoint51l_post, checkpoint48i_post, checkpoint46l_pre, checkpoint52l_post, checkpoint52k_post, chkpt44d_post, checkpoint54, checkpoint51, checkpoint50, checkpoint53, checkpoint52, release1_p8, release1_p9, checkpoint50d_post, release1_p1, release1_p2, release1_p3, release1_p4, release1_p5, release1_p6, release1_p7, checkpoint52f_post, checkpoint50b_pre, checkpoint44e_pre, checkpoint51f_post, release1_b1, ecco_c51_e34d, ecco_c51_e34e, ecco_c51_e34f, ecco_c51_e34g, ecco_c51_e34a, ecco_c51_e34b, ecco_c51_e34c, checkpoint48b_post, checkpoint43, checkpoint51d_post, checkpoint48c_pre, checkpoint47d_pre, checkpoint51t_post, checkpoint51n_post, release1_chkpt44d_post, checkpoint52i_pre, hrcube_1, hrcube_2, hrcube_3, checkpoint51s_post, checkpoint47a_post, checkpoint48d_pre, checkpoint51j_post, checkpoint47i_post, checkpoint52e_pre, checkpoint52e_post, checkpoint51n_pre, checkpoint47d_post, icebear5, icebear4, icebear3, icebear2, checkpoint53d_post, checkpoint46d_pre, checkpoint48d_post, release1-branch_tutorials, checkpoint48f_post, checkpoint45d_post, checkpoint52b_pre, checkpoint54b_post, checkpoint46j_pre, checkpoint51l_pre, checkpoint52m_post, chkpt44a_post, checkpoint44h_pre, checkpoint48h_post, checkpoint51q_post, ecco_c50_e29, checkpoint51b_pre, checkpoint46a_post, checkpoint47g_post, checkpoint52b_post, checkpoint52c_post, checkpoint46j_post, checkpoint51h_pre, checkpoint46k_post, ecco_c50_e28, chkpt44c_pre, checkpoint48a_post, checkpoint45a_post, checkpoint50f_post, checkpoint50a_post, checkpoint50f_pre, checkpoint52f_pre, ecco_c44_e19, ecco_c44_e18, ecco_c44_e17, ecco_c44_e16, release1_p12, release1_p10, release1_p11, release1_p16, release1_p17, release1_p14, release1_p15, checkpoint47j_post, checkpoint54a_pre, ecco_c50_e33a, checkpoint53c_post, branch-exfmods-tag, checkpoint44g_post, branchpoint-genmake2, checkpoint54a_post, checkpoint46e_pre, checkpoint51r_post, checkpoint48c_post, checkpoint45b_post, checkpoint46b_pre, checkpoint51i_post, release1-branch-end, release1_final_v1, checkpoint51b_post, checkpoint51c_post, checkpoint46c_pre, checkpoint53a_post, checkpoint46, checkpoint47b_post, checkpoint44b_post, ecco_c51_e34, checkpoint46h_pre, checkpoint52d_post, checkpoint53g_post, checkpoint46m_post, checkpoint46a_pre, checkpoint50g_post, checkpoint45c_post, ecco_ice2, ecco_ice1, checkpoint44h_post, checkpoint46g_post, release1_p12_pre, checkpoint52a_pre, ecco_c44_e22, checkpoint50h_post, checkpoint52i_post, checkpoint50e_pre, checkpoint50i_post, ecco_c44_e25, checkpoint51i_pre, checkpoint52h_pre, checkpoint53f_post, checkpoint52j_post, checkpoint47f_post, checkpoint50e_post, chkpt44a_pre, checkpoint46i_post, ecco_c44_e23, ecco_c44_e20, ecco_c44_e21, ecco_c44_e26, ecco_c44_e27, ecco_c44_e24, checkpoint46c_post, ecco-branch-mod1, ecco-branch-mod2, ecco-branch-mod3, ecco-branch-mod4, ecco-branch-mod5, branch-netcdf, checkpoint50d_pre, checkpoint52n_post, checkpoint53b_pre, checkpoint46e_post, release1_beta1, checkpoint51e_post, checkpoint44b_pre, checkpoint42, checkpoint40, checkpoint41, checkpoint47, checkpoint44, checkpoint45, checkpoint48, checkpoint49, checkpoint46h_post, checkpoint51o_post, checkpoint51f_pre, chkpt44c_post, checkpoint48g_post, checkpoint53b_post, checkpoint47h_post, checkpoint52a_post, checkpoint44f_pre, checkpoint51g_post, ecco_c52_e35, checkpoint46d_post, checkpoint50b_post, release1-branch_branchpoint, checkpoint51m_post, checkpoint53d_pre, checkpoint54c_post, checkpoint51a_post, checkpoint51p_post, checkpoint51u_post
Branch point for: c24_e25_ice, branch-exfmods-curt, release1_final, release1-branch, branch-genmake2, release1, branch-nonh, tg2-branch, ecco-branch, release1_50yr, netcdf-sm0, icebear, checkpoint51n_branch, release1_coupled
Added package "flt".
 o pkg/flt
 o verification/flt_example
 o visualization of trajectories supplied
 o works but output not available to testscript

1 adcroft 1.1 C $Header: $
2     C $Name: $
3    
4     #include "FLT_CPPOPTIONS.h"
5    
6     subroutine flt_runga2 (
7     I myCurrentIter,
8     I myCurrentTime,
9     I myThid
10     & )
11    
12     c ==================================================================
13     c SUBROUTINE flt_runga2
14     c ==================================================================
15     c
16     c o This routine steps floats forward with second order Runga-Kutta
17     c
18     c ==================================================================
19     c SUBROUTINE flt_runga2
20     c ==================================================================
21    
22     c == global variables ==
23    
24     #include "EEPARAMS.h"
25     #include "SIZE.h"
26     #include "DYNVARS.h"
27     #include "PARAMS.h"
28     #include "GRID.h"
29     #include "FLT.h"
30     #ifdef ALLOW_3D_FLT
31     #include "GW.h"
32     #endif
33    
34     c == routine arguments ==
35    
36     INTEGER myCurrentIter, myThid
37     _RL myCurrentTime
38     INTEGER bi, bj
39     _RL global2local_i
40     _RL global2local_j
41    
42     c == local variables ==
43    
44     integer ip, kp, iG, jG
45     _RL phi, uu, vv, u1, v1
46     #ifdef ALLOW_3D_FLT
47     _RL ww, w1, zt, zz, scalez
48     #endif
49     _RL xx, yy, xt, yt
50     _RL scalex, scaley
51     character*(max_len_mbuf) msgbuf
52     _RL npart_dist
53     Real*8 PORT_RAND
54    
55     c == end of interface ==
56    
57     DO bj=myByLo(myThid),myByHi(myThid)
58     DO bi=myBxLo(myThid),myBxHi(myThid)
59    
60     do ip=1,npart_tile(bi,bj)
61    
62     c If float has died move to level 0
63     c
64     if(
65     & (tend(ip,bi,bj).ne.-1. .and. myCurrentTime.gt. tend(ip,bi,bj))
66     & ) then
67    
68     kpart(ip,bi,bj) = 0.
69    
70     else
71     c Start integration between tstart and tend (individual for each float)
72     c
73     if(
74     & (tstart(ip,bi,bj).eq.-1. .or. myCurrentTime.ge.tstart(ip,bi,bj))
75     & .and.
76     & ( tend(ip,bi,bj).eq.-1. .or. myCurrentTime.le. tend(ip,bi,bj))
77     & .and.
78     & ( iup(ip,bi,bj).ne. -3.)
79     & ) then
80    
81     c Convert to local indices
82     c
83     xx=global2local_i(xpart(ip,bi,bj),bi,bj,mythid)
84     yy=global2local_j(ypart(ip,bi,bj),bi,bj,mythid)
85     kp=INT(kpart(ip,bi,bj))
86    
87     scalex=recip_dxF(INT(xx),INT(yy),bi,bj)
88     scaley=recip_dyF(INT(xx),INT(yy),bi,bj)
89     iG = myXGlobalLo + (bi-1)*sNx
90     jG = myYGlobalLo + (bj-1)*sNy
91    
92    
93     #ifdef ALLOW_3D_FLT
94     if (iup(ip,bi,bj).eq.-1.) then
95     scalez=recip_drF(kp)
96     zt=global2local_j(kpart(ip,bi,bj),bi,bj,mythid)
97     call flt_bilinear3D(xx,yy,uu,zp,uVel,2,bi,bj)
98     call flt_bilinear3D(xx,yy,vv,zp,vVel,3,bi,bj)
99     call flt_bilinear3D(zz,yy,ww,zp,wVel,4,bi,bj)
100     zt=zz+0.5*deltaTmom*zz*scalez
101     else
102     #endif
103     call flt_bilinear(xx,yy,uu,kp,uVel,2,bi,bj)
104     call flt_bilinear(xx,yy,vv,kp,vVel,3,bi,bj)
105     #ifdef ALLOW_3D_FLT
106     endif
107     #endif
108    
109     if (iup(ip,bi,bj).ne.-2.) then
110     uu = uu + uu*(PORT_RAND()-0.5)*flt_noise
111     vv = vv + vv*(PORT_RAND()-0.5)*flt_noise
112     endif
113    
114     c xx and xt are in indices. Therefore it is necessary to multiply
115     c with a grid scale factor.
116     c
117     xt=xx+0.5*deltaTmom*uu*scalex
118     yt=yy+0.5*deltaTmom*vv*scaley
119    
120     c Second step
121     c
122    
123     #ifdef ALLOW_3D_FLT
124     if (iup(ip,bi,bj).eq.-1.) then
125     call flt_bilinear3D(xt,yt,u1,zt,uVel,2,bi,bj)
126     call flt_bilinear3D(xt,yt,v1,zt,vVel,3,bi,bj)
127     call flt_bilinear3D(xx,yy,w1,zt,wVel,4,bi,bj)
128     kpart(ip,bi,bj) = kpart(ip,bi,bj) + deltaTmom*w1*scalez
129     else
130     #endif
131     call flt_bilinear(xt,yt,u1,kp,uVel,2,bi,bj)
132     call flt_bilinear(xt,yt,v1,kp,vVel,3,bi,bj)
133     #ifdef ALLOW_3D_FLT
134     endif
135     #endif
136    
137     if (iup(ip,bi,bj).ne.-2.) then
138     u1 = u1 + u1*(PORT_RAND()-0.5)*flt_noise
139     v1 = v1 + v1*(PORT_RAND()-0.5)*flt_noise
140     endif
141    
142     c xpart is in coordinates. Therefore it is necessary to multiply
143     c with a grid scale factor divided by the number grid points per
144     c geographical coordinate.
145     c
146     xpart(ip,bi,bj) = xpart(ip,bi,bj)
147     & + deltaTmom*u1*scalex*delX(iG)
148     ypart(ip,bi,bj) = ypart(ip,bi,bj)
149     & + deltaTmom*v1*scaley*delY(jG)
150    
151     endif
152     endif
153    
154     enddo
155    
156     ENDDO
157     ENDDO
158     c
159     return
160     end

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