[randolph]

Hi everyone,

Just curious about why the driftFluxFoam tutorial use buoyantKEpsilon as the turbulence model?

driftFluxFoam
Solver for 2 incompressible fluids using the mixture approach with the drift-flux approximation for relative motion of the phases.

buoyantKEpsilon (Compressible RAS turbulence models)
Additional buoyancy generation/dissipation term applied to the k and epsilon equations of the standard k-epsilon model.

Thanks in advance.

[clapointe]

It looks like there is still a gravitational term used by the solver (check out createFields, pEqn, etc) suggesting that the liquid components' relative compressibility/density is not taken into account, but background compressibility/density are (and the difference in density between any gas and the two liquids). I am not terribly familiar with the multiphase family of solvers but if buoyancy is of concern having a RAS model tuned for buoyancy modeling makes sense.

Caelan