Diameter of secondary phase in Eulerian eulerian model

user9 · May 1, 2020, 08:32

I am simulating 2-D axisymmetric miniature channel. I WANT TO STUDY AIR - WATER SLUG FLOW WITHOUT PHASE CHANGE.

IDEALLY FOR SLUG FLOW WE SHOULD USE VOF MODEL.

But I want to use EULERIAN - EULERIAN model where it asks for DIAMETER OF SECONDARY PHASE which is air in my case.

By default it takes 10^(-5) m .
What should be diameter of secondary phase?IMG_20200501_180151.jpg

vinerm · May 1, 2020, 15:09

If the flow morphology is slug or segregated, you won't get good results with Euler until and unless the mesh is very fine. As far as length scale is concerned, you can use a size comparable to expected slug. A smaller size will cause over-interaction between phases and diffuse more momentum than otherwise expected.

May 1, 2020, 08:32	Diameter of secondary phase in Eulerian eulerian model	#1
user9 New Member anuj Join Date: Feb 2020 Posts: 17 Rep Power: 6	I am simulating 2-D axisymmetric miniature channel. I WANT TO STUDY AIR - WATER SLUG FLOW WITHOUT PHASE CHANGE. IDEALLY FOR SLUG FLOW WE SHOULD USE VOF MODEL. But I want to use EULERIAN - EULERIAN model where it asks for DIAMETER OF SECONDARY PHASE which is air in my case. By default it takes 10^(-5) m . What should be diameter of secondary phase?IMG_20200501_180151.jpg

May 1, 2020, 15:09	Length Scale	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	If the flow morphology is slug or segregated, you won't get good results with Euler until and unless the mesh is very fine. As far as length scale is concerned, you can use a size comparable to expected slug. A smaller size will cause over-interaction between phases and diffuse more momentum than otherwise expected. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

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