# Deforming boundaries - is it possible?

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 November 26, 2009, 07:30 Deforming boundaries - is it possible? #1 New Member   Bayard Morales Join Date: Aug 2009 Posts: 24 Rep Power: 15 Hi there. I´m simulationg a kind of bubble column and would like to make it a little more sofisticated. At the top boundary - degassing - it is possible to plot the pressure profile. The highest pressures are, of course, found at the spot where the gas hits this boundary. Is there any way to make the mesh deform following this pressure profile? The goal is to, somehow, simulate the elevation on the liquid surface due the gas. So, where the pressure is higher, the mesh would deform. I´ve been working with this kind of flow, considering a domain bottom half filled of liquid and top half filled of gas, but it is a bit hard to deal with it, so I´m working with a degassing condition now. Any hint? Thanks!

 November 26, 2009, 17:00 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,363 Rep Power: 139 It would be possible to do this as a deforming mesh but I suspect a free surface approach would be better. Can you do a free surface model rather than a degassing boundary?

 November 27, 2009, 04:09 #3 Member     Rui Igreja Join Date: Mar 2009 Location: Aveiro Posts: 68 Blog Entries: 1 Rep Power: 16 I've read there are people doing that (single-phase simulation, and using a moving/deforming boundary to represent the free surface). But I've never seen an example, and always wondered how do you calculate the movement of that free-surface boundary. And what are the limitations of this method relatively to doing a 2-phase free-surface simulation (assuming you don't care what happens in the gaseous phase). Cheers __________________ Rui

 Tags bubble column, deform, mesh

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