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Coriolis and Centrifugal forces

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Old   September 24, 2021, 07:25
Smile Coriolis and Centrifugal forces
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qutadah
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Hello,


I am simulating single phase fluid flow in a 3D Centrifugal pump and I am using the PIMPLE Solver...

I was wondering cosidering the Coriolis and Centrifugal forces in the pump, does the solver consider these forces? and how do i check the term included in the solver? Has anyone done something similar so far?


thanks!
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Old   September 27, 2021, 13:06
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For your application, these are not "terms in the equations" that need to be included, they are effects of flow rotation and will be modelled implicitly in the solver.

The only occasion where you might need to add additional terms into the momentum equation is when you have an external forcing effect - for example the earth's rotation in a case where you are only modelling a small part of the atmosphere. That's not the case here since you are modelling the whole pump (I presume).

The more serious question to ask is: what turbulence model are you using for this type of flow?
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Old   September 28, 2021, 05:36
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Hallo, yes I have asked my supervisor and i got to the conclusion that these forces are a result of velocity and pressure gradients within the pump and are not external forces like you said.


I am using a kOmegaSST model for this pump as a turbulence model.
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Old   September 28, 2021, 08:49
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Just beware: most two equation RANS models struggle with strongly rotating flows, due to their isotropic turbulence assumption. You may find that a Reynolds stress solver improves predictions, although RSM models have their own set of problems. Good luck!
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