...models...
What is the difference between the driftflux model and twofluid model.

Re: ...models...
Hello,
I am using a twofluid model to solve dispersed twophase flows. I know less drift flux model. In two fluid model, you have to solve two sets of conservation equations (mass, momentum, turbulence, ...) for a two phase flow problem, every set of equations corresponds to one phase. Of course the two sets of equations are linked with momentum transfer between phases and volumetric fractions. To solve a multiphase flow problem with a drift flux model, you have one set of conservation equation for every phases and a transportdiffusion equation for the volumetric fraction of each phase. The momentum equations are weighted by the sum of the volumetric fractions weighted by the densities. In a final, with a twofluid model, you have two different velocities at each cell, with a drift flux, only one. If you have only two different phases, it's better to use two fluid model. For more than two, I thing drift flux model is better for computational reasons. 
Re: ...models...
Hi Vincent
Thank you for your reply. So driftflux is a special case of twofluid model. Assuming that we've gasliquid. 
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