How to Model Non Newtonian Laminar Flow?

pranay10 · July 3, 2023, 14:42

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?

Yann · July 4, 2023, 03:46

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)

Regards,
Yann

pranay10 · July 4, 2023, 07:12

I am using OF2212.
Also, I need steady state and not transient state.

Yann · July 4, 2023, 09:06

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.

Cheers,
Yann

pranay10 · July 5, 2023, 01:52

Thank You very much.
Also, may I know where can I find more such files for non-newtonian? Can you provide more if possible?

Yann · July 5, 2023, 03:35

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

Cheers,
Yann

July 3, 2023, 14:42	How to Model Non Newtonian Laminar Flow?	#1
pranay10 New Member Prayan Join Date: Jun 2023 Posts: 10 Rep Power: 3	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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July 4, 2023, 03:46		#2
Yann Senior Member Yann Join Date: Apr 2012 Location: France Posts: 1,148 Rep Power: 27	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) Regards, Yann

July 4, 2023, 07:12		#3
pranay10 New Member Prayan Join Date: Jun 2023 Posts: 10 Rep Power: 3	I am using OF2212. Also, I need steady state and not transient state.

July 4, 2023, 09:06		#4
Yann Senior Member Yann Join Date: Apr 2012 Location: France Posts: 1,148 Rep Power: 27	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. Cheers, Yann

July 5, 2023, 01:52		#5
pranay10 New Member Prayan Join Date: Jun 2023 Posts: 10 Rep Power: 3	Thank You very much. Also, may I know where can I find more such files for non-newtonian? Can you provide more if possible?

July 5, 2023, 03:35		#6
Yann Senior Member Yann Join Date: Apr 2012 Location: France Posts: 1,148 Rep Power: 27	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 Cheers, Yann