[blockMesh] refine mesh with stl region

frantov · July 17, 2020, 00:27

Hi Foamers

Apologies if this was asked before.

Is it possible to refine a region of a mesh created by BlockMesh using an STL file?
The region is defined by an STL and is not part of the geometry (is not a boundary), but is defined initial alpha.water distribution.

What I do is the following:
1. Generate a mesh with blockMesh
2. Set fields (setFieldsDict) with the STL
3. Refine mesh with dynamicMesh dict, but some information is lost as blockMesh is coarse.

I have tried snappyHexMesh, but so far in my attempts, it treats the STL as boundary, and snappy is an overkill as this is a simple geometry.

any clues will be appreciated!
thanks
Fran

frantov · July 17, 2020, 01:06

I found a get around from another post (thanks to OlivierG):

Generating Mesh for a drop in another fluid

1) from you initial mesh, use setFields
2) run 1 iterate with interDyMFoam => this with refine mesh at interface
3) call setField again (re initialise)
4) run ...

July 17, 2020, 00:27	refine mesh with stl region	#1
frantov Member Francisco T Join Date: Nov 2011 Location: Melbourne, Australia Posts: 64 Blog Entries: 1 Rep Power: 15	Hi Foamers Apologies if this was asked before. Is it possible to refine a region of a mesh created by BlockMesh using an STL file? The region is defined by an STL and is not part of the geometry (is not a boundary), but is defined initial alpha.water distribution. What I do is the following: 1. Generate a mesh with blockMesh 2. Set fields (setFieldsDict) with the STL 3. Refine mesh with dynamicMesh dict, but some information is lost as blockMesh is coarse. I have tried snappyHexMesh, but so far in my attempts, it treats the STL as boundary, and snappy is an overkill as this is a simple geometry. any clues will be appreciated! thanks Fran

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July 17, 2020, 01:06		#2
frantov Member Francisco T Join Date: Nov 2011 Location: Melbourne, Australia Posts: 64 Blog Entries: 1 Rep Power: 15	I found a get around from another post (thanks to OlivierG): Generating Mesh for a drop in another fluid 1) from you initial mesh, use setFields 2) run 1 iterate with interDyMFoam => this with refine mesh at interface 3) call setField again (re initialise) 4) run ...