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Udf velocity inlet profile with multiphase mixture (ansys fluent)

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Old   November 23, 2020, 19:12
Smile Udf velocity inlet profile with multiphase mixture (ansys fluent)
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We are two undergraduate students seeking for help!!!

We are trying to simulate a laminar flux through a 3D pipe (25 cm long, 2 cm of diameter) consisting of a multiphase flux (air and water). We want to implement a UDF for the velocity inlet consisting of several time-dependent square pulses.

In our ideal scenario, the pipe is initially full of air and water is injected from the inlet periodically (every injection is a square pulse) and the amount of water decreases with each interval. To do so, we have written the following code, but it does not seem to work.




#include "udf.h

DEFINE_PROFILE(inlet_velocity, t, i)
real current_time;
face_t f;
current_time = CURRENT_TIME;

begin_f_loop(f, t)
if ((current_time < 2) | (current_time > 9 & current_time<14) | (current_time > 21 & current_time<25) | (current_time > 32 & current_time<37) | (current_time > 44 & current_time<49))
F_PROFILE(f, t, i)=0;
else if (current_time >= 2 & current_time<=9)
F_PROFILE(f, t, i)=1*0.08;

else if (current_time >= 14 & current_time<=21)
F_PROFILE(f, t, i)=0.75*0.08;

else if (current_time >= 25 & current_time<=32)
F_PROFILE(f, t, i)=0.5*0.08;

else if (current_time >= 37 & current_time<44)
F_PROFILE(f, t, i)=0.25*0.08;
end_f_loop(f, t)
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Old   November 24, 2020, 07:48
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Use CFX. No need to use Fortran. Just add a few equations to the simulations and off you go.
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Old   December 12, 2020, 01:23
Dnyanesh Mirikar
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Try named expressions feature provided by Ansys and you may end up solving your problem. Let me know if you want any help further.
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ansys fluent, multiphase mixture model, udf

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