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How to Model Non Newtonian Laminar Flow?

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Old   July 3, 2023, 15:42
Default How to Model Non Newtonian Laminar Flow?
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Prayan
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Hello Experts,

I am studying the flow of Non-Newtonian Fluids in a Sinusoidal Channel as part of an ongoing research using OPENFOAM. I am new to this software.

Different models of viscosity like Hershey-Bulkey, Cross-Power Law, Power Law, etc needs to be examined.

The flow is supposed to be laminar. However, there are no solvers in openfoam that solves Non-Newtonian Laminar flows.

What solver can be used in this case?
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Old   July 4, 2023, 04:46
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Hello,

For incompressible flows, you can choose between Newtonian and Non-Newtonian models in the transportProperties file (or physicalProperties, depending on the OpenFOAM version you are using)
And you can also switch between turbulent or laminar flow in pretty much any solver, so I guess any incompressible solver could work.

Do you need steady or transient simulation ?
What OpenFOAM version are you using ? (if not sure, try typing the foamVersion command)

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Yann
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Old   July 4, 2023, 08:12
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I am using OF2212.
Also, I need steady state and not transient state.
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Old   July 4, 2023, 10:06
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Then simpleFoam sounds good.

You can have a look to the TJunctionArrheniusBirdCarreauTransport tutorial to have an example of a setup using a non-Newtonian fluid. It's a pimpleFoam tutorial, so it's transient, but you should be able to use the same transporProperties file on a simpleFoam case.

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Old   July 5, 2023, 02:52
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Thank You very much.
Also, may I know where can I find more such files for non-newtonian? Can you provide more if possible?
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Old   July 5, 2023, 04:35
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Generally speaking, in such situation you can use the banana trick.
In the transportProperties file, define "banana" as transportModel and run the solver. It will throw you an error and give you a list of valid transport models.
You can then search for those transport models in the source code and/or the tutorials to see how to use it.

For instance, it should lead you there in the source code: https://develop.openfoam.com/Develop...iscosityModels

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fluid dynamics, non newtonian power law, research, viscosity, viscosity model

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