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-   -   Periodic boundary conditions (http://www.cfd-online.com/Forums/fluent/49017-periodic-boundary-conditions.html)

 happy5jump August 14, 2008 12:08

Periodic boundary conditions

Hi everyone,

I'm modling a 360 degrees cylinder

I just want to use a 9 degrees slide to simulate the whole geometry.

I set the left and right walls as periodic boundaries.

Now I have two Questions:

1. how to set periodic boundary condition in FLUENT? There's no help in FLUENT about periodic boundary....

2. What does this periodic boundary condition mean?

Is there any relation with the calculation?

Does periodic boundary mean it can simulate the real whole geometry?

Thanks

 red lemon August 14, 2008 17:09

Re: Periodic boundary conditions

Both face sets represent the entire single periodic zone. Use the TUI command Grid>modify zone>make-periodic to create and slit periodic to remove. A periodic means flow through one face comes out of the other. For a regular periodic like turbo cases you need not set anything such as dP or flow in Define>periodics in the GUI. Fluent and Gambit see default periodics as conformal face sets but you can in fact define non conformal periodics using define>grid interface>make periodics. Hope that helps!

 happy5jump August 14, 2008 18:18

Re: Periodic boundary conditions

Thanks!

One more thing I want to know is

This is a 40 inlets geometry Can I just use 1 inlet ,1 outlet, and periodic boundary condition to samulate the whole geometry?

 mAx August 18, 2008 00:39

Re: Periodic boundary conditions

yes you can use only one inlet one your 9deg slice. But regarding the mesh, your both periodic faces have to be linked (eg: same mesh) Gambit won't you allow to set them as periodic if the surface meshes aren't the same.

 fares November 17, 2012 20:34

help in periodic

I have the same problem I want to make the two opp walls at the inlet and outlet of a blade passage to be periodic how can i do so? in fluent 14

 mhossain January 29, 2013 17:06

Quote:
 Originally Posted by red lemon ;152809 Both face sets represent the entire single periodic zone. Use the TUI command Grid>modify zone>make-periodic to create and slit periodic to remove. A periodic means flow through one face comes out of the other. For a regular periodic like turbo cases you need not set anything such as dP or flow in Define>periodics in the GUI. Fluent and Gambit see default periodics as conformal face sets but you can in fact define non conformal periodics using define>grid interface>make periodics. Hope that helps!
Hi,

I have a problem defining the periodic BC in FLUENT. I am simulating a wind turbine blade with one blade and 120 degree domain. but while I apply periodic BC in TUI , I got an error massage that main face and shadow face does not have same number of elements. one of my wall have 465 faces and the corresponding shadow face has 510 face.

How can I fix this problem? Is there any way to fix this problem in FLUENT ? I truly appreciate your suggestions.

Arif

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