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Viscosity computation in interFoam with VOF method |
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May 16, 2018, 00:26 |
Viscosity computation in interFoam with VOF method
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Senior Member
Nguyen Duy Trong
Join Date: Apr 2014
Posts: 124
Rep Power: 12 |
Hi everyone,
It would be appreciated if someone could help me to explain the method for viscosity computation in interFoam. From theory of VOF method, density and dynamics viscosity of mixture flow near interface are computed as: rho = alpha*rho1 + (1-alpha)*rho2 mu = alpha*mu1 + (1-alpha)*mu2 However, when I check source "incompressibleTwoPhaseMixture.H" and "incompressibleTwoPhaseMixture.C", I found the following code: "mu", limitedAlpha1*rho1_*nuModel1_->nu() + (scalar(1) - limitedAlpha1)*rho2_*nuModel2_->nu() and: nu_ = mu()/(limitedAlpha1*rho1_ + (scalar(1) - limitedAlpha1)*rho2_); as I understand, the source code are corresponding to the following fomular: mu = alpha*rho1*nu1 + (1-alpha)*rho2*nu2; and nu = mu/(alpha1*rho1+ (1-alpha)*rho2); Therefore, I think this is not true with the theory of VOF method. Could you please someone help me to correct my understanding?? Thanks |
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