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Mesh deformation & Porous Domain

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Old   July 10, 2018, 03:39
Default Mesh deformation & Porous Domain
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Dimitrios S. P.
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Hello everyone,


how can I model a porous domain to be able for mesh deformation?
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Old   July 14, 2018, 07:17
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Glenn Horrocks
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Do porous domains not allow you to have mesh motion? I can understand why - it will introduce all sorts of new physics which you don't get otherwise. For instance, think about squeezing a wet sponge - it squeezes all the water out. This is new physics which you don't get in stationary meshes.

So if it is not allowed, it is for good reason.

If you still want to have a porous moving mesh domain: The porous domain is simply a source term added to the momentum equation. You can simply add this source term yourself to a moving mesh domain. Of course, if you do this, it is entirely up to you to ensure the model is appropriate, suitable and secondary effects are adequately handled.
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Old   July 18, 2018, 04:53
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Dimitrios S. P.
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Thank you,
I agree that it will introduce new porous features and fluid ejection out of it, but still I need to model all of these.

But, how can I relate a momentum source with the porosity that I am aware of? Is there any bibliography that you know, or a cfx manual special for this?
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Old   July 18, 2018, 06:24
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When you add models on top of each other (eg porous + moving mesh) you get lots of high order terms in the equations. CFX does not have these high order terms. If you want to include these high order terms you will probably need to derive these high order terms and write your own solver.

If you can convince yourself the high order terms are not significant you can implement it in CFX. The CFX theory manual gives the equations used in the built it porous models, you just have to implement those as your own source terms.
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