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[Help Please], Trouble Using UDF to Import Velocity Data -- But All Zeros :( |
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November 11, 2009, 17:14 |
[Help Please], Trouble Using UDF to Import Velocity Data -- But All Zeros :(
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#1 |
New Member
明月出天山
Join Date: Jun 2009
Posts: 6
Rep Power: 17 |
Hello, Friends
I know that I bothered you guys so much but really need help from you guys. I am using Fluent UDF to import velocity from local data files. But the output are always zero, I tested the C program by local c compiler, it works great as what I expected. Please, please take a look at my UDF and let me know what you believe are wrong, thanks a lot! #include "udf.h" #include "mem.h" #include <stdio.h> int Nz = 512; int ts, n; char buffer[50]; real u, v, w; DEFINE_PROFILE(x_velocity, t, i){ FILE *fid; face_t f; /************************* Construct file names here **************************/ ts = N_TIME; n = sprintf(buffer, "Uf_%i.dat", ts % Nz); Message("Importing x-velocity from %s...", buffer); fid = fopen(buffer, "r"); begin_f_loop(f, t){ fscanf(fid, "%f %f %f\n", &u, &v, &w);<=== u, v, w read from here are always zeros /* printf("u = %f, u = %f, u = %f\n", u, v, w);*/ F_PROFILE(f,t,i) = u; } end_f_loop(f,t) fclose(fid); Message("Done\n"); } The data files look like this below 7.241065 -8.430264 85.50916 -9.164535 -1.508738 82.77167 10.84698 -2.585959 90.85329 -3.974935 -2.802197 92.33000 ... ... |
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November 11, 2009, 17:30 |
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#2 |
Member
Ivan
Join Date: May 2009
Posts: 85
Rep Power: 17 |
I also want to know how to read a big data file and assigne velocity to the boundary.
for example, save the unsteady outflow boudary velocity data, and use it as inlet velocity in another simulation. |
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