Alpha gradient definition in multiphaseInterFoam ?!

behzad-cfd · September 18, 2017, 11:48

Hi,
In multiphaseInterFoam, surfaceTentionForce() function, gradient of alpha definition is

Code:

*(

fvc::interpolate(alpha2)*fvc::snGrad(alpha1)

- fvc::interpolate(alpha1)*fvc::snGrad(alpha2)

)

But in interFoam it's simply fvc::snGrad(alpha1).

I know in first case we have an alpha per phase, my question is about origin of such a definition.

behzad-cfd · September 19, 2017, 13:20

Actually i want to couple VOF with level-set based on multiphaseInterFoam solver. can i define gradient of psi field (level-set field) in similar way?

Thanks in advance,

September 18, 2017, 11:48	Alpha gradient definition in multiphaseInterFoam ?!	#1
behzad-cfd Member behzad Ghasemi Join Date: Sep 2013 Location: Iran Posts: 56 Rep Power: 13	Hi, In multiphaseInterFoam, surfaceTentionForce() function, gradient of alpha definition is Code: ( fvc::interpolate(alpha2)fvc::snGrad(alpha1) - fvc::interpolate(alpha1)*fvc::snGrad(alpha2) ) But in interFoam it's simply fvc::snGrad(alpha1). I know in first case we have an alpha per phase, my question is about origin of such a definition.

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September 19, 2017, 13:20		#2
behzad-cfd Member behzad Ghasemi Join Date: Sep 2013 Location: Iran Posts: 56 Rep Power: 13	Actually i want to couple VOF with level-set based on multiphaseInterFoam solver. can i define gradient of psi field (level-set field) in similar way? Thanks in advance,