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how do I get a solid volume moving?

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Old   March 13, 2008, 12:17
Default how do I get a solid volume moving?
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Hello all!

This might be a trivial question but I am rather confused at the moment...

Say I have a large box and inside there is a small box. I'd like to get the small box "moving" in positive x-direction meaning that the box should stay put but it should get the fluid around it moving.

In Fluent this is done by saying that the small solid box has a motion type of "moving reference frame" and giving a value for its translational velocity. As a boundary condition the walls of the small box are given the correct velocity. This way the box itself isn't really moving anywhere but a boundary layer forms around it i.e. it induces movement in the fluid around it.

How do I do this in CFX??

Thanks in advance!
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Old   March 18, 2008, 03:31
Default Re: how do I get a solid volume moving?
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It is similar in CFX as that of in Fluent. Here it is MFR rather MRF, but the concept is same.

Just think in relatve velocity sense. For this you need to :

Additional setting need to be done when setting the domain to be moving domain (translating domain)
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Old   March 28, 2008, 05:50
Default Re: how do I get a solid volume moving?
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Doesn't MFR allow only rotational motion? I've been looking for some informations on transient simulations with moving meshes with large deformations but found nothing.
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