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Old   April 4, 2013, 23:19
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Fraser
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Hi there,

(3d, pbns, VOF, spe, lam, transient)

I'm modeling fluid flows down a narrow pipe (fluids = water and air). In the "cell zone conditions" menu, the only zone I see is air [attachment1]. I believe I should see water and air.

Also: I'm trying to add surface tension effects between the walls and the water, but in the menu it appears I can only add the effects between the two fluids. Actually, with the options I've selected, I can't even find the option of setting a wall fluid angle interaction anymore...

I have some suspicion that these problems are related. Any ideas?

Thanks
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Old   April 6, 2013, 09:11
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I think it is surface tension between water and air, not water and wall.
go on phase interaction panel and set the water-air surface tension.
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Old   April 6, 2013, 20:33
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Good point, thanks! I made a slight mistake asking my question: If I want to set a contact angle (say at 90 degrees) with the wall for the water droplet, how do I do that? It doesn't appear I can set it for wall/water, even though in the manual it appears I can do this.
Make sense?
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Old   April 7, 2013, 00:32
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90 Degree....
just decrease gavity and increase water-air surface tension.
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Old   April 9, 2013, 07:54
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Ok think I figured it out now! Thanks for your help! In case people are wondering, I was able to set the angle. In a VOF model, I selected "Wall Adhesion" in the momentum tab of the phase interaction. Then I set the angle in the boundary conditions tab.
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