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Modelling a Water-Air bubble column

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Old   February 27, 2012, 14:21
Default Modelling a Water-Air bubble column
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Gerhard Holzinger
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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?
Attached Images
File Type: jpg bubbleColumnBlockMesh.jpg (16.4 KB, 80 views)
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Old   February 28, 2012, 05:12
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Alberto Passalacqua
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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.

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