[GerhardHolzinger]

Greetings foamers,

I try to simulate a water-air bubble column like the becker test-case (Becker et al. 1999: flat bubble column, single gas-sparger in the centre of the bottom)

The mesh is easily built using blockMesh. I attached a screenshot of the mesh.

The solver I use is twoPhaseEulerFoam.

My questions are:

Which dragModels are recommended for gas bubble - water eulerian simulation?

Are there any changes that have to be made when starting from one of the tutorial cases?

[alberto]

The standard drag model used for that test cases by many authors in the literature is Schiller-Neumann, and the drag phase is the dispersed one (air). OpenFOAM defaults to the "blended" model, which is more stable when phase separation occurs.

Best,