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-   -   Viscous model problem with bubbles in multiphase (http://www.cfd-online.com/Forums/fluent/47569-viscous-model-problem-bubbles-multiphase.html)

Shin March 10, 2008 18:31

Viscous model problem with bubbles in multiphase
 
I'm trying to make Taylor bubbles in an annular capillary. (OD:8mm;ID=4mm)The liquid phase is water and the gas phase is air. I used unsteady VOF Explicit method with Geo-Reconstruct and other suitable settings (e.g. surface tension and wall adhesion)

The thing is on the selection of viscous model. In my case, Reynolds number is somewhat small, 10-100 for both phase. However, tubulent k-epsilon model gave more reasonable shape of bubbles. If I run with laminar flow, bubbles have random shapes and sizes, which are not expected in usual Taylor or slug flows. In the other hand, k-epsilon model made regular bubbles I expected.

What do you think about this? I'm missing something?


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