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[blockMesh] can i have two blockmesh blocks one inside each other |
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April 7, 2012, 08:20 |
can i have two blockmesh blocks one inside each other
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#1 |
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Mihai Pruna
Join Date: Apr 2010
Location: Boston
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i'm finding difficult to capture geometry such as a thin wing for SHM without creating a huge number of cells which crashes SHM.
i want to intersect the STL with the minimum amount of cells and for that i want to create a finer block around the STl and a coarser block around it. Can I do that with only two blocks, one inside each other?
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April 7, 2012, 08:54 |
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#2 |
Senior Member
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I would probably do that in snappyHexMesh rather than in blockMesh.
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April 7, 2012, 09:20 |
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#3 |
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Mihai Pruna
Join Date: Apr 2010
Location: Boston
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I have a refinement box defined in SHM
but the stl has to intersect the blocks in blockmesh otherwise it doesn't get captured, right? so a thin wing, even if it intersects spanwise and chordwise, if it doesn't intersect thicknesswise it won't show up?
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April 7, 2012, 13:18 |
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#4 |
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Sorry, I haven't quite understood what you mean… Do you want to refine the mesh on the domain or on the surface of your geometry?
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April 7, 2012, 14:55 |
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#5 |
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Mihai Pruna
Join Date: Apr 2010
Location: Boston
Posts: 195
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what i want is to use blockmesh to make a finer block where the object is to ensure intersection and a coarser block for the whole domain. ideally with just two blocks.
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April 7, 2012, 15:05 |
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#6 |
Senior Member
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So you need something like what depicted in the attached image.
The domain is a simple square block from blockMesh. The refinement zones are two blocks from SHM. |
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April 7, 2012, 15:40 |
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#7 |
Senior Member
Mihai Pruna
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Location: Boston
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but what if you replace the sphere with an airfoil whose thickness is less than the height of a BM block?
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April 8, 2012, 04:58 |
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#8 |
Senior Member
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mmm… could you post a picture that shows your blockmesh and your airfoil within it?
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April 8, 2012, 09:03 |
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#9 |
Senior Member
Mihai Pruna
Join Date: Apr 2010
Location: Boston
Posts: 195
Rep Power: 16 |
thanks lore. i think my mesh is pretty coarse actually. i'll try another approach for airfoils, namely a fine 2d mesh with further refinement around the surface. that should give me the resolution i need without the resource drain.
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