Problem with slug(or taylor) formation in a microchannel

alanzago · February 10, 2016, 15:23

Hello guys,

I'm working with two phase flow (gas-liq). I'm using an experimental data for validate my model.
My model can predict the regime in some especifics meshs, when I started to refine the mesh the slug don't form. I don't know yet why.

In attachment there's a formation of a slug (rough mesh) and other image (fine mesh) where the formation don't occurs.

Someone already had this problem?

silent2608 · February 10, 2016, 16:37

Hi, please post images of the mesh and dimensions of mesh (also what's the vertical dimension of the pipe in mm?) + surface tension and wall adhesion related settings. If both have been done with the same settings and only mesh size is different that would be very interesting.

Other than that generally speaking VOF multiphase results will never be mesh independent (meaning unlimited fine mesh does not mean converging results). Initially you will get better results with a finer mesh, but at some point your results will diverge usually.

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February 10, 2016, 16:37		#2
silent2608 New Member Join Date: Nov 2015 Posts: 17 Rep Power: 11	Hi, please post images of the mesh and dimensions of mesh (also what's the vertical dimension of the pipe in mm?) + surface tension and wall adhesion related settings. If both have been done with the same settings and only mesh size is different that would be very interesting. Other than that generally speaking VOF multiphase results will never be mesh independent (meaning unlimited fine mesh does not mean converging results). Initially you will get better results with a finer mesh, but at some point your results will diverge usually.