Simple question on dynamic meshes

celestial · April 2, 2019, 11:51

I presume most users of this forum know that Foam allows modifications to the mesh topology when the relative position of solids changes ( e.g. rotating devices like fans, compressors)

But what about altering it depending on the current numerical solution in a domain ? For example, if a solution gradient is greater than a given threshold at a given cell, it would be nice if one could refine the mesh around that cell. And make it coarser when the solution gradient will later be less than the given threshold.

Best, Marc

Blumenkind · April 3, 2019, 08:26

It can be pretty easily done using the Mesh Refinement from dynamicFvMesh. Check out the DamBreakWithObstacle tutorial...

celestial · April 4, 2019, 10:43

I checked that the source code for the dam break tutorial indeed includes refinement. I don't understand it enough yet to figure out if it can be adapted to some arbitrary threshold on a solution gradient as in my example, but it's a start. Thanks for the info, Marius.

April 2, 2019, 11:51	Simple question on dynamic meshes	#1
celestial Member Join Date: Mar 2019 Posts: 86 Rep Power: 7	I presume most users of this forum know that Foam allows modifications to the mesh topology when the relative position of solids changes ( e.g. rotating devices like fans, compressors) But what about altering it depending on the current numerical solution in a domain ? For example, if a solution gradient is greater than a given threshold at a given cell, it would be nice if one could refine the mesh around that cell. And make it coarser when the solution gradient will later be less than the given threshold. Best, Marc

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April 3, 2019, 08:26		#2
Blumenkind New Member Marius Bünker Join Date: Oct 2017 Posts: 13 Rep Power: 8	It can be pretty easily done using the Mesh Refinement from dynamicFvMesh. Check out the DamBreakWithObstacle tutorial...

April 4, 2019, 10:43		#3
celestial Member Join Date: Mar 2019 Posts: 86 Rep Power: 7	I checked that the source code for the dam break tutorial indeed includes refinement. I don't understand it enough yet to figure out if it can be adapted to some arbitrary threshold on a solution gradient as in my example, but it's a start. Thanks for the info, Marius.