udf for phase change
I want to simulate the phase tranfer in the heat pipe, and a udf was compiled in FLUENT,which is as follow:
#include "udf.h" #include "sg_mphase.h" #define T_SAT 323 #define LAT_HT 2356e3 DEFINE_SOURCE(vap_src, cell, pri_th, dS, eqn) { Thread *mix_th, *sec_th; real m_dot_v; mix_th = THREAD_SUPER_THREAD(pri_th); sec_th = THREAD_SUB_THREAD(mix_th, 1); /*m_dot_v=0.;*/ if(C_T(cell, mix_th)>=T_SAT) { m_dot_v = 0.1*C_VOF(cell, sec_th)*C_R(cell, sec_th)*fabs(C_T(cell, sec_th) - T_SAT)/T_SAT; dS[eqn] = 0.; } if(C_T(cell, mix_th)<=T_SAT) { m_dot_v = -0.1*C_VOF(cell, pri_th)*C_R(cell, pri_th)*fabs(T_SAT-C_T(cell,pri_th))/T_SAT; dS[eqn] = -0.1*C_R(cell, pri_th)*fabs(C_T(cell, pri_th) - T_SAT)/T_SAT; } return m_dot_v ; } DEFINE_SOURCE(liq_src, cell, sec_th, dS, eqn) { Thread * mix_th, *pri_th; real m_dot_l; mix_th = THREAD_SUPER_THREAD(sec_th); pri_th = THREAD_SUB_THREAD(mix_th, 0); /*m_dot_l=0.;*/ if(C_T(cell, mix_th)>=T_SAT) { m_dot_l = -0.1*C_VOF(cell, sec_th)*C_R(cell, sec_th)*fabs(C_T(cell, sec_th) - T_SAT)/T_SAT; dS[eqn] = -0.1*C_R(cell, sec_th)*fabs(C_T(cell, sec_th) - T_SAT)/T_SAT; } if(C_T(cell, mix_th)<=T_SAT) { m_dot_l = 0.1*C_VOF(cell, pri_th)*C_R(cell, pri_th)*fabs(T_SAT-C_T(cell,pri_th))/T_SAT; dS[eqn] =0.; } return m_dot_l; } DEFINE_SOURCE(enrg_src, cell, mix_th, dS, eqn) { Thread *pri_th, *sec_th; real m_dot; pri_th = THREAD_SUB_THREAD(mix_th, 0); sec_th = THREAD_SUB_THREAD(mix_th, 1); if(C_T(cell, mix_th)>=T_SAT) { m_dot = -0.1*C_VOF(cell, sec_th)*C_R(cell, sec_th)*fabs(C_T(cell, sec_th) - T_SAT)/T_SAT; dS[eqn] = -0.1*C_VOF(cell, sec_th)*C_R(cell, sec_th)*LAT_HT/T_SAT; } if(C_T(cell, mix_th)<=T_SAT) { m_dot = 0.1*C_VOF(cell, pri_th)*C_R(cell, pri_th)*fabs(T_SAT-C_T(cell,pri_th))/T_SAT; dS[eqn] = 0.1*C_VOF(cell, pri_th)*C_R(cell, pri_th)*LAT_HT/T_SAT; } return LAT_HT*m_dot; } Using the code above, I can simulate the evaporation, but the condensation did not appear, even the temperature of vapor was much lower than the saturation temperature. Now I am so confused. Anyone can help me? |
Udf
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Dear Jone The latent heat at any temperature you took it? I am also just boiling occurred but condensation no i do not know why your simulation is good now? Many Thanks |
phase change problem inside heat pipe
Dear friends, I'm doing the same problem as my project work. In my simulation condensation is also not happening in condenser zone. If anyone got results, please help me.
Thanks |
udf for phase change
Hi,
I'm using same udf for my simulation of evaporation in a rectangular channel. As i initialize my solution i'm getting "fatal error(segmentation fault)". I've also tried hooking udf after some iteration still getting same error. Cab anyone help? Thnks |
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