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Old   July 11, 2006, 06:39
Default UDF problem
Posts: n/a
can you tell me what is wrong in my udf?

#include "udf.h"

DEFINE_MASS_TRANSFER(od_gas_to_liquidh2o_source,ce ll,thread,from_2,from_species_0,to_3,to_species_1) { int i; Material *sp; real m_lg; real T_SAT = 373; Thread *gas = THREAD_SUB_THREAD(thread, from_2); Thread *liq = THREAD_SUB_THREAD(thread, to_3); m_lg = 0.;

mixture_species_loop(THREAD_MATERIAL(liq),sp,i) {

if ((C_T(cell, liq) >= T_SAT) && sp) { m_lg = (-0.1*C_VOF(cell,liq)*C_R(cell,liq)* fabs(C_T(cell,liq)-T_SAT)/T_SAT); }


mixture_species_loop(THREAD_MATERIAL(gas),sp,i) { if ((m_lg == 0. ) && (C_T(cell, gas) <= T_SAT)) { m_lg = (0.1*C_VOF(cell,gas)*C_R(cell,gas)* fabs(T_SAT-C_T(cell,gas))/T_SAT); } } return (m_lg); }

UDF is compiled by fluent but during initialize an error occurred (below)

Error: FLUENT received fatal signal (ACCESS_VIOLATION) 1. Note exact events leading to error. 2. Save case/data under new name. 3. Exit program and restart to continue. 4. Report error to your distributor. Error Object: ()

thank you g
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Old   July 11, 2006, 08:24
Default Re: UDF problem
Birute Bunkute
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Hi Greg,

I have the same problem with definition of critical strain rate to extinction in the partially premixed model. I think, it is the problem not with your UDF, but Fluent.

Regards, Birute
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Old   July 12, 2006, 02:21
Default Re: UDF problem
Posts: n/a
hi.I had a similar error message one month ago.You should check the use of User Define Memories.If you use UDMI in you UDF,you must define enough memories in Fluent before solving.Hope it will help you
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