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-   -   Stop, Remesh and Continue (http://www.cfd-online.com/Forums/cfx/93744-stop-remesh-continue.html)

Doginal October 25, 2011 09:39

Stop, Remesh and Continue
 
Hello Everyone

I am simulating a blade moving with a large displacement. Because of this the mesh gets very skewed and i would like to remesh it part way through. I am having trouble finding how to go about doing this. Currently the only way i know of is to stop at a specific point, create a new geometry file at the blades new location, mesh that and run it as its own simulation but using the .def file from the first simulation as its starting conditions.

Is this the correct method. I'm not even sure this works properly. Also is there a way to pull the geometry from where i paused the first simulation in order to avoid creating my own geometry at location 2.

Any help would be greatly appreciated. Even just pointing me in the direction of somewhere else to look would be very helpful.

Thank You,

DM

singer1812 October 25, 2011 13:55

You can autoremesh if you setup your mesh in ICEM. You just use scripting and configurations. Works well but you need to know ICEM.

If your motion is prescribed, you can also setup a series of meshes in various states at certain timepoints in your analysis. Setup configurations to stop at those predetermined times, read in the new mesh, and restart automatically. This works very well.

Concerning remshing in ICEM, use help and search for remeshing. For the other method use help and search for configurations.

Doginal October 25, 2011 14:06

Quote:

Originally Posted by singer1812 (Post 329412)
You can autoremesh if you setup your mesh in ICEM. You just use scripting and configurations. Works well but you need to know ICEM.

If your motion is prescribed, you can also setup a series of meshes in various states at certain timepoints in your analysis. Setup configurations to stop at those predetermined times, read in the new mesh, and restart automatically. This works very well.

Concerning remshing in ICEM, use help and search for remeshing. For the other method use help and search for configurations.

Thanks for your reply

I've managed to do the ICEM remesh before but I am trying to avoid ICEM. I do have a specified motion so your second idea sounds very useful however i'm not sure how to do that. Any advice on how to do it or where to look for further instruction?

Edit:
I was just thinking of another way of going about this and am curious if it is possible. I know i can set a "configuration" to stop the simulation at certain criteria (example stop if mesh orthogonal angle is below a specified amount). I have also recently started looking at using parameters sets to easily change simple geometries.

Would it be possible to have a parameter track the motion of something (in my case an inner domain) so a configuration stops the simulation and i just click remesh using the new parameter values and continue the sim?

singer1812 October 25, 2011 14:16

The help is really good on this and can explain it better than I am willing to, but the low down is this:

1) Generate your series of meshes. Make sure you generate them close enough that your mesh doesn't become bad prior to replacing it with the next case.
2) Define interupt control(s) in Solver Control tab that correspond to the times you want the new mesh inserted
3) Use configuration to control the ongoing run

It really is pretty easy.

In order to make sure your mesh wont fail prior to the new mesh, you can run the analysis with flow solvers turned off. This will only solve the mesh displacement.


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