[Gmsh] dynamic remeshing

[feng hobble]

Hi Edgar,

I am dealing with parachute simulation. It seems we shared same challenges.

Do you also have to deal with fluid-structure interaction? I guess so since
the bubble wall can be regarded as a structure like airbag which is
air-structure-air inside out.
If so what kind of implement method are you using to solve the FSI problem?

Now I am trying to use the FSI Solver that's developed by Johan Hoffman to
solve the highly coupled nonlinear systems. I also asked him about the local
mesh update.
He confirmed the capability of his package but I have not tried yet.

Zhan



Message: 3
Date: Sat, 16 Feb 2008 10:12:16 +0100
From: Edgar Last <edgar-chat at live.com>
Subject: [Gmsh] dynamic remeshing
To: <gmsh at geuz.org>
Message-ID: <BLU140-W3383971C5BEAF0B2C9D814E5270 at phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"


Hello!

I want to simulate two (elastic) bubbles rising in a cylinder filled with
water. The  tetrahedral mesh is moving together with the fluid which is
dragged upward in the vicinity of the bubbles. Of course the mesh quality
decreases during the process, resulting in highly irregular or even
degenerated elements.

I am looking for a very fast remeshing algorithm that establishes a good
mesh quality whenever it has become worse than some threshold. Is such a
remeshing available in gmsh? Or some other open source 3D mesh tool?

What is the basic idea behind remeshing algorithms? Do they invalidate those
elements that are quenched too irregular, maybe together with some more
elements in their vicinity, and then a new mesh is created in the
invalidated region? Or can such a recycling of most parts of the mesh not be
performed efficiently, and the complete mesh has to be regenerated instead?

Please give a few links where the basics of remeshing are discussed on a not
too sophisticated level.
Thanks
Edgar
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