Algebraic/ Robbins BC problem again in UDF ??
To all fluent expert all over the world;
Especially to FJ, I had modified my BC according to your suggestion but it still cant work. The BC wall value (simulated) still equal with initial value (guess). I explain my problem again..... i dont have the exact BC wall mass fraction value...i got a relationship which link BC wall mass fraction with adjacent mass fraction value. C_YI(BC) = 0.0001*C_YI(BC ajacent cell) So, what wrong with my UDF ??? Here is my UDF: DEFINE_PROFILE(solute, thread, position) { real z; face_t f; cell_t c = F_C0(f,thread) ; Thread *t= THREAD_T0(thread); begin_f_loop(f,thread); { z= C_YI(c,thread,0); F_PROFILE(f, thread, position) = z; } end_f_loop(f, thread); } Thank you very much From KKLAU 
Re: Algebraic/ Robbins BC problem again in UDF ??
Maybe you just forgot to include C_YI(BC) = 0.0001*C_YI(BC ajacent cell) in your UDF.

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