Impose a diffuse flux in an inlet

mireis · June 8, 2010, 07:38

Hi!
I'm studying a simple case: an enclosure with an inlet and an outlet. The boundary type for the inlet is 'pressure_inlet' and it lets me enter a flow direction. Nonetheless I don't want all the flow entering the enclosure to have the same direction, I want a diffuse flux where most part of it (let's say 70%) is in the direction perpendicular to the inlet surface whereas the rest of it has a random direction (something similar to the lobe that defines the intensity emitted by an antenna... do you know what I mean?)
How could I impose this flux in FLUENT?

THanks!

jpcfd · June 8, 2010, 07:46

Hi,

You can define a udf for defining profiles for the velocity as boundary condition for an inlet. There is a nice example in the udf documentation.

mireis · June 10, 2010, 05:00

Thanks!
But now I have another problem:
I wanted to impose 3 profiles. One for each velocity direction. The problem is that, even if I interpret three source files in FLUENT (Interpreted UDFs panel) when I try to hook them to each velocity component in FLUENT it only recognises the last one I interpreted... so at the end I can only specify one of three profiles.
What I'm doing wrong? FLUENT cannot use more than a UDF Boundary condition?

June 8, 2010, 07:38	Impose a diffuse flux in an inlet	#1
mireis New Member Mireia Ayop Join Date: Apr 2010 Posts: 12 Rep Power: 15	Hi! I'm studying a simple case: an enclosure with an inlet and an outlet. The boundary type for the inlet is 'pressure_inlet' and it lets me enter a flow direction. Nonetheless I don't want all the flow entering the enclosure to have the same direction, I want a diffuse flux where most part of it (let's say 70%) is in the direction perpendicular to the inlet surface whereas the rest of it has a random direction (something similar to the lobe that defines the intensity emitted by an antenna... do you know what I mean?) How could I impose this flux in FLUENT? THanks!

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June 8, 2010, 07:46		#2
jpcfd New Member Join Date: Jun 2009 Posts: 11 Rep Power: 16	Hi, You can define a udf for defining profiles for the velocity as boundary condition for an inlet. There is a nice example in the udf documentation.

June 10, 2010, 05:00		#3
mireis New Member Mireia Ayop Join Date: Apr 2010 Posts: 12 Rep Power: 15	Thanks! But now I have another problem: I wanted to impose 3 profiles. One for each velocity direction. The problem is that, even if I interpret three source files in FLUENT (Interpreted UDFs panel) when I try to hook them to each velocity component in FLUENT it only recognises the last one I interpreted... so at the end I can only specify one of three profiles. What I'm doing wrong? FLUENT cannot use more than a UDF Boundary condition?