The density cross the interface is incorrect in the KEpsilon model in interFoam?
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Recently I have found a paper (OMAE2015-41812) discussed about the KEpsilon model in the interFoam (2.3.0), which claimed that "The existing formulations treat the density as a constant without considering its variations crossing the air and water free surface which is not correct. "
See the attached pic for more details. I then checked KEpsilon.C, for the Dissipation equation Code:
Code:
tmp<fvScalarMatrix> kEqn Code:
volScalarField G(GName(), nut_*2*magSqr(symm(fvc::grad(U_)))); Then I checked the UEqn in interFoam (2.3.0), which reads, Code:
fvVectorMatrix UEqn Code:
tmp<fvVectorMatrix> kEpsilon::divDevRhoReff Now I have the questions, which is this "const volScalarField& rho"? It is rho_water, rho_air, or rho = alpha.water*rho_water + alpha.air*rho_air, with alpha.air = 1 - alpha.water? Do you guys think the treatment in interFoam is correct or not? The paper is linked here: https://www.dropbox.com/s/53nvxo79m8...41812.pdf?dl=0 |
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