# Entries for October 8, 2012

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## Moving mesh & LaplaceFaceDecomposition

Posted October 8, 2012 at 21:41 by sunliming

Quote:
Originally Posted by ngj
Hi all

I am doing mesh motion using the laplaceFaceDecomposition method available in OF-1.5-dev. It is running without any problems in serial, however, when I decompose the case, the solver stalls on the very first encounter with mesh.update().

I have made the solver myself, so I used icoDyMFoam on the "movingConeMotion" tutorial, and the same behaviour is found for a decomposed case (2 processors).

My question is twofold: (i) Is it possible to
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## Convergence moving mesh

Posted October 8, 2012 at 21:40 by sunliming

Quote:
Originally Posted by hjasak
The solver looks fine (well, at least not obviously wrong). However, your residual behaviour indicates a serious problem and my guess is that you have messed up the boundary conditions.

Note that the wall boundary needs to be specified in terms of absolute velocity, so a moving wall with no flux through it will not have fixedValue (0 0 0). If this is the problem use the movingWallVelocity b.c., which corrects the normal component based on the mesh motion.

As a test,
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## Moving mesh part 2

Posted October 8, 2012 at 21:37 by sunliming

Quote:
Originally Posted by lr103476
Hi,

The mesh motion works using the latest development code using the oscillatingFixedValue boundary condition. Now I am considering oscillating bodies (flat plates and cylinders) on different grids at low Reynolds numbers to see how the grid motion behaves.

I've got the following questions/remarks:

1) On coarse grids the meh motion performs very nicely, but on finer grids the mesh gots distorted near the body causing the flow solver to diverge. Since
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## How to let the mesh motion solver just solve a small region near a moving boundary?

Posted October 8, 2012 at 21:34 by sunliming

Quote:
Originally Posted by zhajingjing
Hi,
I use mesh motion solver for a moving boundary, and it takes a lot of time to move the whole mesh, if setting the part of mesh just near the moving boundary to move can be realized(that means just solve mesh equation in a region near the moving boundary), then I can save much time to run the case.

So how to let the mesh motion solver just solve a small region near a moving boundary? Can someone give me a hint?
Thanks!

Jingjing
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