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Old   October 10, 2005, 10:05
Default Overset (Chimera) with OpenFOAM
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Alan
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Hello,

is it possible with FOAM to perform Overset (Chimera) simulations? E.g. I would like to compute a rotating helicopter blade in a free stream. Another example would be to simulate a closing valve where the valve ball is meshed in one mesh and imbedded into a background mesh of the channel geometry.

Thanks a lot for any hints. Alan
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Old   October 10, 2005, 10:09
Default Re: Overset (Chimera) with OpenFOAM
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Hrvoje Jasak
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Nope, no Chimera meshes are allowed. The mesh support is for arbitrary polyhedral meshes but the space needs to be filled without overlap.

If you want to do cases like valve or a rotating helicopter blade, you should use the sliding mesh capability. This means you've got two meshes next to each other and one rotates relative to the other. At every time step, they get re-connected by re-creating the interface faces. Have a look at the icoTopoFoam example on a mixer vessel.

Enjoy,

Hrv

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Old   October 10, 2005, 12:44
Default Re: Overset (Chimera) with OpenFOAM
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Alan
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Thanks a lot for your comments (puno vam hvala).

Can I handle completely closing valves with OpenFOAM? E.i. the gap becomes zero and the flow seases - or the other way round: a completely closed valve opens up because of increasing pressure force?

I will test out your suggestions (and probably come back with a lot of questions

- Alan

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Old   January 30, 2010, 01:11
Default Re: Overset (Chimera) with OpenFOAM
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David Boger
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Quote:
Originally Posted by Alan View Post
is it possible with FOAM to perform Overset (Chimera) simulations?
Well, it is possible. See any plans for Chimera grids??
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Old   February 2, 2010, 11:03
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Pei-Ying Hsieh
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Hi, David,

I am very impressed by your work on integrating overset with OpenFOAM.

I am wondering if we can discuss your work in more detail?

My email is: phsieh2005@yahoo.com

Thanks!

Pei
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Old   February 8, 2010, 01:32
Default Chimera
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Johannes N Theron
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David

Do you have any plans to release your overset grid functionality to the wider OpenFOAM community?

Thanks!

Dr. Johannes Theron
KanoeFabrik
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Old   February 8, 2010, 08:00
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We are unfortunately not permitted to give out the library at this time, but we will try to share our experiences and some of the details of the implementation at the upcoming OpenFOAM workshops.
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Old   February 8, 2010, 09:40
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Johannes N Theron
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Is this because of restrictions having been placed on DirtLib and Sugarr?

Jan
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