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2-D phase change heat transfer UDF

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Old   May 24, 2020, 00:14
Default 2-D phase change heat transfer UDF
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Arun raj.S
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Hello everyone, I am performing 2-D phase change heat transfer simulation. I would like to compute the inlet velocity as a function of mass flux and density. The mass flux needs to be computed over each cell in the inlet edge and integrated to get the overall mass flux. Also, the density of the fluid must be corresponding to the fluid in the zone. For example, if it is liquid inlet, it needs to be liquid density. And if it is vapor inlet, it needs to be vapor density. I have prepared this UDF and it works fine. Could anyone confirm if my UDF is right or wrong? It could be help for others too.

#include "udf.h"

DEFINE_PROFILE(velocity_inlet, t, i)
real A[ND_ND];
face_t f;
Thread *tf;
begin_f_loop(f, t)
F_PROFILE(f, t, i) = F_FLUX(f,tf) / (F_AREA(A,f,t)*F_R(f,tf));
end_f_loop(f, t);
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Old   May 25, 2020, 12:21
Default Udf
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If it works then it's good. But I doubt it. You are trying to apply a profile UDF to an inlet where no values are assigned. If you do not specify either velocity or mass flow rate, how do you expect Fluent to determine the velocity. So, the UDF will compile alright but will not lead to any results.

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