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Viscosity properties for transport models

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Old   March 20, 2010, 15:27
Default Viscosity properties for transport models
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jeff osborne
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Hi everyone, I'm new to OpenFOAM and CFD in general. I am trying to understand the different transport models (ie. newtonian, birdcarreau etc). I understand what each one is used for, but I don't know what the viscosity properties represent for each of them. For example, what do nu0, nuInf, m and n for the CrossPowerLaw model? Also, is there somewhere that has a list of what each one represents?

Thanks
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Old   March 23, 2010, 04:38
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Primoz Ternik
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Quote:
Originally Posted by ozzythewise View Post
Hi everyone, I'm new to OpenFOAM and CFD in general. I am trying to understand the different transport models (ie. newtonian, birdcarreau etc). I understand what each one is used for, but I don't know what the viscosity properties represent for each of them. For example, what do nu0, nuInf, m and n for the CrossPowerLaw model? Also, is there somewhere that has a list of what each one represents?

Thanks
Hi Jeff,

I really suggest to grab hands on a book (actually there are a lot of books) dealing with non-Newtonian fluids and their models; for example

Pierre J. Carreau, Daniel C.R. De Kee and Raj. P. Chhabra: Rheology of Polymeric Systems (Principles and Applications)

is a nice choice! It explains Generalized Newtonian Fluids, Linear Viscoelasticity, Nonlinear Viscoelasticity, ...

Regards,
Primoz
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Old   March 23, 2010, 04:46
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hello

i dont know how about your german

but there is

a book form Giesekus :

Einführung in die phänomenlogische modellierung (springer 1994)

and Böhme

Strömungsmechnaik nicht newtonischer fluide (teubner 2000)

in englisch

Bird, Armstron

polymeric dynamics (willey 1989)
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Old   October 7, 2010, 10:41
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Nima Sam
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hi jeff osborne
could you find finally what nuInf, nu0, ... means ?
could you find those suggested book?
did you find any reference to explain the crossflow coefficient ?
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Old   October 7, 2010, 20:39
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Lachlan Graham
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Hi Jeff,
Once you have a handle on the viscosity models from a non-Newtonian book, I suggest that you set up a simple laminar pipe flow in OpenFoam and see the effect of changing the rheology models. There are analytical solutions for pipe flow which can be used for comparison.
Check the shear rate definition in OpenFoam as well as you need the correct shear rate for a correct viscosity calculation, search the forum for the details.
Regards,
Lachlan
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