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Variable mass flow at boundary

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Old   November 20, 2003, 09:01
Default Variable mass flow at boundary
  #1
Dimitrios
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Hi fellow Fluent users...

As I'm new to this software, everything feels and is strange.....my newest problem though is that I have a boundary with variable mass flow rate due to changes in area. Can I specify this variation in Fluent or do I have to do it in another way?
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Old   November 20, 2003, 09:52
Default Re: Variable mass flow at boundary
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ap
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You can implement it using UDF.

Hi

ap
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Old   November 20, 2003, 10:03
Default Re: Variable mass flow at boundary
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Dimitrios
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Thanks a bunch ap
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Old   November 20, 2003, 10:13
Default Re: Variable mass flow at boundary
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mateus
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Hi!

Your Udf shoul look something like this (it's an axample from udf fluent documentation - for variable velocity inlet)

/************************************************** ********************

unsteady.c

UDF for specifying a transient velocity profile boundary condition ************************************************** *********************/

#include "udf.h"

DEFINE_PROFILE(unsteady_velocity, thread, position) { face_t f; real t = CURRENT_TIME;

begin_f_loop(f, thread)

{

F_PROFILE(f, thread, position) = 20. + 5.0*sin(10.*t);

} end_f_loop(f, thread) }

regards

MATEUS
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Old   November 24, 2003, 11:20
Default Re: Variable mass flow at boundary
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Dimitrios
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Don't they have a similar thing for variable mass flux inlet among the udf examples?
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Old   November 26, 2003, 15:05
Default Re: Variable mass flow at boundary
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co2
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I wish they had examples to serve all our research problems ! life would be so easy then !
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Old   November 27, 2003, 03:24
Default Re: Variable mass flow at boundary
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Dimitrios
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You don't say? LOL
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