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December 20, 2012, 12:55 |
UDF steady state to transient
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#1 |
New Member
Vcent
Join Date: Nov 2012
Posts: 5
Rep Power: 14 |
Hi,
After successfully using a UDF for a nonlinear velocity profile at an inlet in a steady state mode, I would like to run it in a transient mode. I added the factor time. However the function only runs with constants for "q" (see red part). Otherwise I get a error "divergence detected in AMG solver x-momentum". After testing several parts, I think it has probably something to do with y=x[1] (see blue part). Does anyone know a solution? #include "udf.h" DEFINE_PROFILE(inlet_x_velocity, thread, index) { real x [ND_ND]; real y; face_t f; real t = CURRENT_TIME; real q; begin_f_loop(f,thread) { F_CENTROID(x,f,thread); y=x[1]; if (CURRENT_TIME <= 100000.0) q = 2.0*pow((y/3.0),0.4); else q = 1; F_PROFILE(f, thread, index)=q; } end_f_loop(f, thread); } thanks, Vcent |
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Tags |
state, steady, transient, udf, velocity |
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