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Moving mesh: how to fix a zone?

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Old   June 8, 2012, 06:03
Default Moving mesh: how to fix a zone?
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Samuele Z
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Dear All,

I have a problem with a moving mesh. I have 2 cellZones and I would like to fix one of them.
What I wanna do is to make only one zone move. Is it possible?

Thanks a lot,

Samuele
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Old   June 12, 2012, 06:46
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Ivar de Hoogt
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I'm not sure, but my first hunch says that it should be possible to define the grid diffusivity to be much larger in the region you'd like to remain stationary than in the moving zone. That way, the deformation in the ''stationary'' zone will be negligable at least..
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Old   June 12, 2012, 06:55
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Samuele Z
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Thanks Ivar,

any idea about how to do that?

Thanks,

Samuele
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Old   June 12, 2012, 07:09
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I do know of a few cumbersome methods, but as for an efficient one, I'm afraid I have to disappoint you. Might be that it's possible, but unfortunately, I'm not an expert..

A few options that I know of are:

- inverseVolume grid diffusivity -> this is not really what you want, since it requires a high cell density in the stationary region, which is probably not of significant importance.

- a specified list of grid diffusivity values (for each mesh point)

- Define all grid lines in the stationary region as patches with uniform value (0 0 0) boundary condition for motionU (EDIT: this is for the 1.6-extend version interTrackFoam solver. I read in other posts that you use OF 2.1. The dictionaries might differ, but the general idea stays the same)

Perhaps these give a hint to determining a better method, but it might depend on the case you're trying to solve.
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Last edited by Ivho; June 12, 2012 at 07:53.
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