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#1 |
Senior Member
Klaus
Join Date: Mar 2009
Posts: 280
Rep Power: 22 ![]() |
Hello,
I am working on a hydrofoil simulation. What are and when is it necessary to set CrossPowerLawCoeffs and BirdCarreauCoeffs in the transportProperties file? Currently my file looks like this: /*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 1.7.1 | | \\ / A nd | Web: www.OpenFOAM.com | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class dictionary; location "constant"; object transportProperties; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // transportModel Newtonian; rho rho [ 1 -3 0 0 0 0 0 ] 1000; //water nu nu [ 0 2 -1 0 0 0 0 ] 1e-06; //water 20°C // ************************************************** *********************** // Do I have to add something like: CrossPowerLawCoeffs { nu0 nu0 [ 0 2 -1 0 0 0 0 ] 1e-06; nuInf nuInf [ 0 2 -1 0 0 0 0 ] 1e-06; m m [ 0 0 1 0 0 0 0 ] 1; n n [ 0 0 0 0 0 0 0 ] 1; } BirdCarreauCoeffs { nu0 nu0 [ 0 2 -1 0 0 0 0 ] 1e-06; nuInf nuInf [ 0 2 -1 0 0 0 0 ] 1e-06; k k [ 0 0 1 0 0 0 0 ] 0; n n [ 0 0 0 0 0 0 0 ] 1; } And if so, what would be reasonable values? Klaus |
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#2 |
Senior Member
Chris Sideroff
Join Date: Mar 2009
Location: Ottawa, ON, CAN
Posts: 434
Rep Power: 22 ![]() |
They are for non-Newtonian viscosity models. Here's a bit on wikipedia about generalized Newtonian models with links to the various types:
http://en.wikipedia.org/wiki/General...ewtonian_fluid Furthermore, to use them you would have to change transportModel from Newtonian to the appropriate non-Newtonian model (i.e. CrossPowerLaw or BirdCarreau) otherwise the coefficients are ignored. |
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#3 |
Member
Join Date: Feb 2016
Posts: 41
Rep Power: 10 ![]() |
i was just going through a tutorial where they showed that you can have the CrossPower Law Coeffs and BirdCarreauCoeffs setup (link below). I would assume that if you have values in these, then by using the "Newtonian" setting for the transportModel then it just ignores these values..?
http://www.somogyibence.hu/documents.../Cornell1.html |
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