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How to save velocity profile at the outlet?

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Old   December 18, 2017, 07:25
Default How to save velocity profile at the outlet?
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I'm trying to get the velocity profile at the end of each iteration/time-step, so that I can make the inlet be the same.
Unfortunately, I only found out how to do it with Mass flow rate, and not the profile:


#if !RP_HOST
  Thread *t = Lookup_Thread(d,zone_ID);
  face_t  f;
  real sum = 0.0;
  my_mass_flow = 0.5;

  /* Compute Mass Flow at Outlet */
     my_mass_flow += F_PROFILE(f,t,i);

  my_mass_flow = PRF_GRSUM1(my_mass_flow);

   face_t f;
     F_PROFILE(f,t,i) = my_mass_flow;
Is there anyway to do this for the velocity profile?
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Old   December 18, 2017, 08:48
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Are you now writing a UDF to implement a periodic boundary condition? This is already included in Fluent, you don't have to write anything for this...
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Old   December 18, 2017, 08:54
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Hi pakk, thanks for the answer.
Unfortunately, I have two problems with that:

1-Being this periodic condition at the inlet and outlet, I can't seem to make this condition right, especcially because I have 2 inlets and 2 outlets, and the flow is oscillating, resulting in some high variations of both Mass flow and pressure gradient conditions, which must be established in the periodic conditions menu.

2-Since I have other periodic boundaries in the geometry, and in these the pressure gradient is always 0 (it's essentially just repeating the geometry sideways), I cannot create different periodic conditions for each periodic boundary, correct? At least I didn't find a way to make those conditions vary between boundaries.
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