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-   -   dynamicMultiDirRefineFvMesh? (http://www.cfd-online.com/Forums/openfoam-programming-development/106516-dynamicmultidirrefinefvmesh.html)

mturcios777 August 30, 2012 19:53

dynamicMultiDirRefineFvMesh?
 
Hello all,

I'm looking for a way to dynamically refine/unrefine the mesh based on the values of a specific field (like dynamicFvRefineMesh) but to only do it in the prescribed directions.

I had three related questions:

1) Can this already be done with dynamicRefineFvMesh (i.e., is there a flag or somethign I'm missing)?

2) If #1 is false, can the arguments/inputs to hexRef8 be altered to only refine/unrefine in certain directions?

3) If #2 and #1 are false, I intend to write a new class that makes use of multiDirRefine like rhe refineMesh utility. Looking at the code for that mesh makes it look fairly easy to use, but I don't see an easy way to un-refine a region. Is un-refinement even possible?

Thanks guys, I promise to share anything that I develop that is useful...

tgvosk October 6, 2012 15:54

Marco,

I've looked for this a little bit too, but from what I've seen:

1/2. AFAIK, no, the existing mesh refinement assumes in many places that each hex is split into 8 new cells (hexRef8, refinementHistory, and others have hard-coded the '8', and I don't see any hexRef4 that has been defined. If there was a hexRef template for D dimensions, that would be nice...)

3. Un-refinement is definitely possible, the current dynamicRefineFvMesh does this by storing the original cells from which refined cells are cut so they can be coarsened if desired. I'm not sure if refineMesh stores this information though, or just makes a new mesh.

Hope that helps a little. This would be very useful for 2D simulations!


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