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UDF for transient pressure inlet, mass flow check at nozzle exit and volumetric heat |
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August 17, 2011, 02:07 |
UDF for transient pressure inlet, mass flow check at nozzle exit and volumetric heat
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denny lee
Join Date: Feb 2011
Posts: 7
Rep Power: 15 |
hello, guys.
I have a problem to apply udf to my model. the problem is analysizing very small nozzle. However, I have no idea to code and apply udf. first, I used a pressure inlet to vary a total pressure from 0 to 10Mpa using udf. It's good to check and analysis the nozzle. But, in addition, I have to apply checking a mass flow rate at nozzle exit. after checking the mass flow rate, I should apply a volumetric heat addition as per mass flow rate( mass flow rate * mdot Q). here is the question. 1. I hooked the below code, however, I think it is not working. I wanna do change the pressure from 2Mpa to 10Mpa and check the mass flow rate at the exit simultaneously. plz help me.. Please see the attach #include "udf.h" face_t f; cell_t c; DEFINE_EXECUTE_AT_END(mass) { Domain *d; real flow=0; real p=0; Thread *t; d = Get_Domain(1); t= Lookup_Thread(d, 7); begin_f_loop(f,t) { flow+=F_FLUX(f,t); } end_f_loop(f,t) p = C_P(c,t); printf("MASS Flow Rate: %g\n",flow); } DEFINE_PROFILE(pre, t, i) { real pressure_mag; real cu_tim; //face_t f; cu_tim = CURRENT_TIME; if((cu_tim>=0)&&(cu_tim<10)) { pressure_mag=202650+101325*cu_tim; } else { pressure_mag=1013250; } begin_f_loop(f,t) { F_PROFILE(f,t,i) = pressure_mag; } end_f_loop(f,t) } Last edited by kokoory; August 17, 2011 at 08:16. Reason: add the code |
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