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August 13, 2009, 19:37 |
No data is written into UDM
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#1 |
Member
Ivan
Join Date: May 2009
Posts: 85
Rep Power: 17 |
I am doing unsteady flow around a 3D airfoil, and use the following UDF to obtain time-averaged pressure coefficient on the airfoil surface. the coefficient is stored in user defined memory (UDM) 1.
the UDF is successful interpreted into fluent. after several time steps, I plot--xy plot the UDM 1, and they are all zero. it seems that no data is written into the UDM. Anyone point out where I do wrong? Thanks a lot! /************************************************** **************************/ /* UDF to compute time-averaged pressure coefficient */ /************************************************** **************************/ /* be sure to allocate at least two UDM*/ #include "udf.h" int n=0; /* number of time-step */ int zone_ID=5; /* zone ID of airfoil surface */ DEFINE_EXECUTE_AT_END(time_avr_PC) { Domain *domain = Get_Domain(1); Thread *t = Lookup_Thread(domain, zone_ID); real p_ref=0, den_ref=1.225, u_ref=21.911; /* reference pressue, reference density and reference velocity */ real q_ref=1/2*den_ref*u_ref*u_ref; /* reference dynamic pressure */ face_t f; n++; begin_f_loop(f, t) { F_UDMI(f,t,0) += F_P(f,t); F_UDMI(f,t,1) = (F_UDMI(f,t,0)/n - p_ref)/q_ref; } end_f_loop(f, t) } |
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August 13, 2009, 19:49 |
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#2 |
Member
Ivan
Join Date: May 2009
Posts: 85
Rep Power: 17 |
I just found out that I forgot to hook the UDF. I did it and make sure I have allocated two UDM, and I resumed the computation and I got this error right after a time was completed.
Error: Chip: internal error: invalid builtin -1: pc=46 Error Object: #f What does it mean? This is my first UDF, oh.. I am so frustrated .... |
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