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Convergence moving mesh

Posted October 8, 2012 at 21:40 by sunliming

Quote:
Originally Posted by hjasak View Post
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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Old

Moving mesh part 2

Posted October 8, 2012 at 21:37 by sunliming

Quote:
Originally Posted by lr103476 View Post
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 View Post
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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Old

Pop the hood on ANSYS meshing

Posted October 4, 2012 at 13:05 by PSYMN

Thought I would show a little about how to "pop the hood" on ANSYS Meshing and Access the ICEM Technology underneath...

Here is a link...

http://www.ansys-blog.com/2012/10/04...ive/#more-3335
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Old

Processor Affinity to Enhance Speed

Posted September 11, 2012 at 11:09 by Hisham (Notes for OpenFOAM!)
Updated September 12, 2012 at 10:02 by Hisham

To enhance the speed of running a solver one can use a "hard" assignment of the job to a specific core. This reduces the work needed to switch jobs between cores and enhances the speed. It is really neat if you need to do some other work on the workstation while the run is going on in the background.

Install:
Code:
# apt-get install schedtool
Use:
Code:
$ schedtool -a 5 10640
This command assigns job 10640...
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