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October 9, 2008, 11:34 |
Pb with simple Fluent UDF example for inlet
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Hi all,
I want use a fully turbulent velocity profile in the inlet of my computational domain. I have used a very simple udf from the udf examples of Fluent. The udf is interpreted without error message but when: * I want to initialize my solution with my velocity profile at the inlet I've got: Error: prf-set-var: invalid flonum Error Object: nan * I try to iterate, I have this error message: Error: > (greater-than): invalid argument [2]: wrong type [not a number] Error Object: nan So I suspect a division by zero, but can't find it in my udf. Any ideas ? Thanks a lot for your help. Regards Francois ------------------------udf begins here--------------------- #include "udf.h" #define YMIN 0.5 #define YMAX 1.5 #define UMEAN 1.0 #define B 1./7. #define DELOVRH 0.5 #define VISC 1.7894e-05 #define CMU 0.09 #define VKC 0.41 /* profile for x-velocity */ DEFINE_PROFILE(x_velocity, t, i) { real y, del, h, x[ND_ND], ufree; face_t f; h = YMAX - YMIN; del = DELOVRH*h; ufree = UMEAN*(B+1.); begin_f_loop(f, t) { F_CENTROID(x,f,t); y = x[1]; if (y <= del) F_PROFILE(f,t,i) = ufree*pow(y/del,B); else F_PROFILE(f,t,i) = ufree*pow((h-y)/del,B); } end_f_loop(f, t) } ----------------------udf end here------------------------- |
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