# how do I get a solid volume moving?

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 March 13, 2008, 12:17 how do I get a solid volume moving? #1 Katariina Guest   Posts: n/a 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!

 March 18, 2008, 03:31 Re: how do I get a solid volume moving? #2 Sach Guest   Posts: n/a 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)

 March 28, 2008, 05:50 Re: how do I get a solid volume moving? #3 milosz Guest   Posts: n/a 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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