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Old   April 16, 2020, 13:05
Default Volume fraction
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Hi,

I am analysing material flow behaviour of a plate in which a tool is rotating and mixing the two fluids (the two parts of the plate here being considered as two fluids).

So, what should be the method(coupled/ simple/ simplec/ etc.) and solution controls (value of momentum, pressure, density, volume fractions etc.) to use in the solver?

Again what should be the typical value of the courant no. and volume fraction courant number in multiphase flows?

And should I use steady or transient method for this type of simulation?
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Old   April 16, 2020, 14:01
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You description is not very clear. A plate as a fluid is rather vague. Could you describe in more detail, may be using a few images?
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Old   April 16, 2020, 14:18
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Kindly see the problem statement. (Attached.).

Looking forward to responses in my trailing questions.
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File Type: jpg 15870574302691481705363724625475.jpg (107.5 KB, 10 views)
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Old   April 16, 2020, 14:22
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This appears to be friction stir welding. You can refer the following

https://www.sciencedirect.com/scienc...38785418309268
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Old   April 16, 2020, 14:25
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But he is using for similar materials. But in my case it is of dissimilar materials i.e. of steel and Aluminium. So what methods and solution controls should I use?
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Old   April 16, 2020, 14:28
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Since both the materials are in liquid phase and miscible, you have to use a species transport with two components.
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Old   April 16, 2020, 14:30
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Sir I didn't understand. Can you pls elaborate what to do and how?
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Old   April 16, 2020, 14:44
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Fluent, and most of the CFD tools, have a model called species transport or multicomponent model. This is different from multiphase models, such as, VOF, Euler-Euler, DPM, etc. Species transport assumes that the components are mixed at molecular level, like oxygen and nitrogen in the air. But their fractions can vary. So, if in your case, the liquids can mix, then you should enable species transport model. Look at the following

https://www.afs.enea.it/project/nept...ug/node512.htm

Species transport is compatible with multiphase models, so, you can have both species transport and multiphase together. Species transport will model two liquids as one mixture and multiphase model will model two phases, one represented by the mixture of two liquids and the other could be air around it.
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