/[MITgcm]/MITgcm/pkg/flt/flt_bilinear.F
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Revision 1.1 - (hide annotations) (download)
Thu Sep 13 17:43:55 2001 UTC (22 years, 9 months ago) by adcroft
Branch: MAIN
CVS Tags: checkpoint46n_post, checkpoint51k_post, checkpoint47e_post, checkpoint52l_pre, ecco_c44_e19, hrcube4, hrcube5, checkpoint46l_post, checkpoint46g_pre, checkpoint47c_post, release1_p13_pre, checkpoint50c_post, checkpoint46f_post, checkpoint52d_pre, checkpoint48e_post, checkpoint50g_post, checkpoint46b_post, checkpoint52j_pre, checkpoint43a-release1mods, checkpoint51o_pre, checkpoint44g_post, checkpoint54d_post, checkpoint48c_post, checkpoint54e_post, ecco_c50_e32, ecco_c50_e33, ecco_c50_e30, ecco_c50_e31, release1_p13, checkpoint51l_post, checkpoint48i_post, checkpoint46l_pre, checkpoint50d_pre, checkpoint52k_post, chkpt44d_post, checkpoint54, checkpoint51, 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, checkpoint48b_post, ecco_c51_e34d, ecco_c51_e34e, ecco_c51_e34f, ecco_c51_e34g, ecco_c51_e34a, ecco_c51_e34b, ecco_c51_e34c, checkpoint43, checkpoint51d_post, checkpoint48c_pre, checkpoint51t_post, checkpoint51n_post, release1_chkpt44d_post, chkpt44c_pre, checkpoint52i_pre, hrcube_2, hrcube_3, checkpoint51s_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, ecco_c50_e28, checkpoint51l_pre, checkpoint52m_post, checkpoint47d_pre, checkpoint53b_post, checkpoint44h_pre, checkpoint48h_post, checkpoint51q_post, ecco_c50_e29, checkpoint51b_pre, checkpoint46a_post, checkpoint47g_post, checkpoint52b_post, chkpt44c_post, checkpoint46j_post, checkpoint51h_pre, checkpoint46k_post, checkpoint46b_pre, checkpoint52h_pre, checkpoint45a_post, checkpoint50f_post, checkpoint50a_post, checkpoint50f_pre, hrcube_1, checkpoint51m_post, checkpoint52c_post, checkpoint44e_post, ecco_c44_e18, ecco_c44_e17, ecco_c44_e16, release1_p12, release1_p10, release1_p11, release1_p16, release1_p17, release1_p14, release1_p15, checkpoint47a_post, ecco_c50_e33a, checkpoint53c_post, branchpoint-genmake2, checkpoint54a_post, checkpoint46e_pre, checkpoint51r_post, checkpoint45b_post, checkpoint51i_post, release1-branch-end, release1_final_v1, checkpoint51b_post, release1_p12_pre, checkpoint46c_pre, checkpoint53a_post, checkpoint44f_post, checkpoint47b_post, checkpoint44b_post, ecco_c51_e34, checkpoint46h_pre, checkpoint52d_post, checkpoint53g_post, checkpoint46m_post, checkpoint46a_pre, checkpoint50c_pre, checkpoint45c_post, ecco_ice2, ecco_ice1, checkpoint44h_post, checkpoint46g_post, checkpoint51c_post, checkpoint52a_pre, checkpoint46i_post, checkpoint50h_post, checkpoint52i_post, checkpoint50e_pre, checkpoint50i_post, ecco_c44_e25, checkpoint54c_post, checkpoint51i_pre, checkpoint48a_post, checkpoint53f_post, checkpoint47j_post, checkpoint54a_pre, checkpoint53b_pre, branch-exfmods-tag, checkpoint52j_post, checkpoint47f_post, checkpoint50e_post, chkpt44a_pre, ecco_c44_e22, 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, checkpoint52l_post, checkpoint52n_post, checkpoint46e_post, release1_beta1, checkpoint51e_post, checkpoint44b_pre, checkpoint42, checkpoint40, checkpoint41, checkpoint46, checkpoint47, checkpoint44, checkpoint45, checkpoint48, checkpoint49, checkpoint46h_post, checkpoint51o_post, checkpoint50, checkpoint51f_pre, chkpt44a_post, checkpoint47h_post, checkpoint52a_post, checkpoint44f_pre, checkpoint51g_post, ecco_c52_e35, checkpoint46d_post, checkpoint50b_post, release1-branch_branchpoint, checkpoint52f_pre, checkpoint53d_pre, checkpoint51a_post, checkpoint51p_post, checkpoint48g_post, checkpoint51u_post
Branch point for: c24_e25_ice, branch-exfmods-curt, release1_coupled, release1_final, release1-branch, branch-genmake2, release1, branch-nonh, tg2-branch, ecco-branch, release1_50yr, netcdf-sm0, icebear, checkpoint51n_branch 
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_bilinear(
7     I xp,
8     I yp,
9     O uu,
10     I kp,
11     I u,
12     I nu,
13     I bi,
14     I bj
15     & )
16    
17     c ==================================================================
18     c SUBROUTINE flt_bilinear
19     c ==================================================================
20     c
21     c o Bilinear scheme to find u of particle at given xp,yp location
22     c
23     c ==================================================================
24     c SUBROUTINE flt_bilinear
25     c ==================================================================
26    
27     c == global variables ==
28    
29     #include "SIZE.h"
30    
31     c == routine arguments ==
32    
33     _RL xp, yp
34     _RL uu
35     integer nu, kp, bi, bj
36     _RL u (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
37    
38     c == local variables ==
39    
40     INTEGER nnx, nny, nfx, nfy, nfxp, nfyp
41     _RL dx, dy, ddx, ddy
42     integer ip
43     _RL xx, yy, phi, scalex, scaley
44     _RL u11, u12, u22, u21
45    
46     c == end of interface ==
47    
48     nnx = int(xp)
49     nny = int(yp)
50     dx = xp - float(nnx)
51     dy = yp - float(nny)
52     c
53     c to chose the u box in which the particle is found
54     c nu=1 for T, S
55     c nu=2 for u
56     c nu=3 for v
57     c nu=4 for w
58     c
59     if (nu.eq.1.or.nu.eq.4) then
60     nfx = nnx
61     nfy = nny
62     ddx = dx
63     ddy = dy
64     endif
65     c
66     if (nu.eq.2) then
67     if (dx.le.0.5) then
68     nfx = nnx
69     ddx = dx + 0.5
70     else
71     nfx = nnx + 1
72     ddx = dx - 0.5
73     endif
74     nfy = nny
75     ddy = dy
76     endif
77     c
78     if (nu.eq.3) then
79     if (dy.le.0.5) then
80     nfy = nny
81     ddy = dy + 0.5
82     else
83     nfy = nny + 1
84     ddy = dy - 0.5
85     endif
86     nfx = nnx
87     ddx = dx
88     endif
89     c
90     c
91     cab change start
92     c was correct only for global?
93     c if(nfx.gt.nx) nfx=nfx-nx
94     if(nfx.gt.nx) nfx=nx
95     cab change end
96     if(nfy.gt.ny) nfy=ny
97     nfxp = nfx + 1
98     nfyp = nfy + 1
99     cab change start
100     c if (nfx.eq.nx) nfxp = 1
101     if (nfx.eq.nx) nfxp = nfx
102     cab change end
103     if (nfy.eq.ny) nfyp = nfy
104    
105     if (nu.lt.4) then
106     u11 = u(nfx,nfy,kp,bi,bj)
107     u21 = u(nfxp,nfy,kp,bi,bj)
108     u22 = u(nfxp,nfyp,kp,bi,bj)
109     u12 = u(nfx,nfyp,kp,bi,bj)
110     endif
111     if (nu.eq.4) then
112     u11 = u(nfx,nfy,kp,bi,bj)+u(nfx,nfy,kp-1,bi,bj)
113     u21 = u(nfxp,nfy,kp,bi,bj)+u(nfxp,nfy,kp-1,bi,bj)
114     u22 = u(nfxp,nfyp,kp,bi,bj)+u(nfxp,nfyp,kp-1,bi,bj)
115     u12 = u(nfx,nfyp,kp,bi,bj)+u(nfx,nfyp,kp-1,bi,bj)
116     endif
117     c
118     c
119     c bilinear interpolation (from numerical recipes)
120     uu = (1-ddx)*(1-ddy)*u11 + ddx*(1-ddy)*u21 + ddx*ddy*u22
121     . + (1-ddx)*ddy*u12
122     c
123     c
124     return
125     end
126    
127    
128     subroutine flt_bilinear2d(
129     I xp,
130     I yp,
131     O uu,
132     I u,
133     I nu,
134     I bi,
135     I bj
136     & )
137    
138     c ==================================================================
139     c SUBROUTINE flt_bilinear2d
140     c ==================================================================
141     c
142     c o Bilinear scheme to find u of particle at given xp,yp location
143     c o For 2D fields
144     c
145     c started: Arne Biastoch abiastoch@ucsd.edu 13-Jan-2000
146     c (adopted from subroutine bilinear)
147     c
148     c ==================================================================
149     c SUBROUTINE flt_bilinear2d
150     c ==================================================================
151    
152     c == global variables ==
153    
154     #include "SIZE.h"
155    
156     c == routine arguments ==
157    
158     _RL xp, yp
159     _RL uu
160     integer nu, bi, bj
161     _RL u (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
162    
163     c == local variables ==
164    
165     INTEGER nnx, nny, nfx, nfy, nfxp, nfyp
166     _RL dx, dy, ddx, ddy
167     integer ip
168     _RL xx, yy, phi, scalex, scaley
169     _RL u11, u12, u22, u21
170    
171     c == end of interface ==
172    
173     nnx = int(xp)
174     nny = int(yp)
175     dx = xp - float(nnx)
176     dy = yp - float(nny)
177     c
178     c to chose the u box in which the particle is found
179     c nu=1 for T, S
180     c nu=2 for u
181     c nu=3 for v
182     c nu=4 for w
183     c
184     if (nu.eq.1.or.nu.eq.4) then
185     nfx = nnx
186     nfy = nny
187     ddx = dx
188     ddy = dy
189     endif
190     c
191     if (nu.eq.2) then
192     if (dx.le.0.5) then
193     nfx = nnx
194     ddx = dx + 0.5
195     else
196     nfx = nnx + 1
197     ddx = dx - 0.5
198     endif
199     nfy = nny
200     ddy = dy
201     endif
202     c
203     if (nu.eq.3) then
204     if (dy.le.0.5) then
205     nfy = nny
206     ddy = dy + 0.5
207     else
208     nfy = nny + 1
209     ddy = dy - 0.5
210     endif
211     nfx = nnx
212     ddx = dx
213     endif
214     c
215     cab change start
216     c was correct only for global?
217     c if(nfx.gt.nx) nfx=nfx-nx
218     if(nfx.gt.nx) nfx=nx
219     cab change end
220     if(nfy.gt.ny) nfy=ny
221     nfxp = nfx + 1
222     nfyp = nfy + 1
223     cab change start
224     c if (nfx.eq.nx) nfxp = 1
225     if (nfx.eq.nx) nfxp = nfx
226     cab change end
227     if (nfy.eq.ny) nfyp = nfy
228    
229     if (nu.lt.4) then
230     u11 = u(nfx,nfy,bi,bj)
231     u21 = u(nfxp,nfy,bi,bj)
232     u22 = u(nfxp,nfyp,bi,bj)
233     u12 = u(nfx,nfyp,bi,bj)
234     endif
235     if (nu.eq.4) then
236     u11 = u(nfx,nfy,bi,bj)+u(nfx,nfy,bi,bj)
237     u21 = u(nfxp,nfy,bi,bj)+u(nfxp,nfy,bi,bj)
238     u22 = u(nfxp,nfyp,bi,bj)+u(nfxp,nfyp,bi,bj)
239     u12 = u(nfx,nfyp,bi,bj)+u(nfx,nfyp,bi,bj)
240     endif
241     c
242     c
243     c bilinear interpolation (from numerical recipes)
244     uu = (1-ddx)*(1-ddy)*u11 + ddx*(1-ddy)*u21 + ddx*ddy*u22
245     . + (1-ddx)*ddy*u12
246     c
247     c
248     return
249     end
250    
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