|March 20, 2010, 15:27||
Viscosity properties for transport models
Join Date: Mar 2010
Posts: 108Rep Power: 7
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?
|March 23, 2010, 04:38||
Join Date: Apr 2009
Location: Maribor, Slovenia
Posts: 65Rep Power: 8
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, ...
|March 23, 2010, 04:46||
Join Date: Jul 2009
Posts: 63Rep Power: 8
i dont know how about your german
but there is
a book form Giesekus :
Einführung in die phänomenlogische modellierung (springer 1994)
Strömungsmechnaik nicht newtonischer fluide (teubner 2000)
polymeric dynamics (willey 1989)
|October 7, 2010, 10:41||
Join Date: Sep 2009
Location: Tehran, Iran
Blog Entries: 1Rep Power: 15
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 ?
|October 7, 2010, 20:39||
Join Date: Dec 2009
Posts: 14Rep Power: 7
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.
|birdcarreau, crosspowerlaw, newtonian, transport model|
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