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[snappyHexMesh] Multi region meshing & recovering the original patch names |
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March 24, 2010, 08:01 |
Multi region meshing & recovering the original patch names
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#1 |
New Member
Join Date: Mar 2010
Posts: 1
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Hello All,
I have been trying to do some multi region (multi volume) using snappyHexMesh (sHM) with a simple two boxes side by side geometry. I am struggling with getting it to work, in terms of getting 2 distinct volume regions and recovering my original geometry patches. I've attached a tiny tar archive of the case for reference. I started with the following individual STL files :- box01.stl (5 out of 6 faces of a closed box) baffle01.stl (common wall between the two box volumes) box02.stl (5 out of 6 faces of a closed box) baffle02.stl (copy of baffle01.stl but with flipped normals) I then edited the individual STL files and post-fixed the "solid" and "endsolid" keywords with the desired region name :- box01_baffle01 box01_box01 box02_baffle02 box02_box02 These four individual files were then concatenated together to form the final 2 closed volume multi region STL parts :- cat box01.stl baffle01.stl > fluid_box01.stl cat box02.stl baffle02.stl > fluid_box02.stl As a side note I found that I couldn't recover the correct two volumes if the normals weren't consistently facing outward for each volume (I am guessing inward normals would also work). In the sHM dictionary (under refinementSurfaces{} ) I defined the following 2 face and 2 cell zone names in order to extract the 2 regions (the key geometry{} & refinementsurfaces{} sections are posted at the bottom of this message for convenience) :- fluid_box01_fz fluid_box01_cz fluid_box02_fz fluid_box02_cz I then ran blockMesh (whose extents are purposefully larger than those of the STL geometry) and sHM on the case before running "splitMeshRegions -cellZones" utility. This recovers nicely the 3 distinct regions in my case - fluid_box01_cz, fluid_box02_cz and domain0 which contains the remaining volume cells, outside of the 2 box STL geometry. The following lists the resulting patches for each of the 3 recovered regions :- "domain0" boundary patches ---------- minX maxX minY maxY minZ maxZ domain0_to_fluid_box01_cz domain0_to_fluid_box02_cz "fluid_box01_cz" boundary patches ----------- fluid_box01_cz_to_domain0 fluid_box01_cz_to_fluid_box02_cz "fluid_box02_cz" boundary patches ----------- fluid_box02_cz_to_fluid_box01_cz fluid_box02_cz_to_domain0 My question is how can I preserve or recover the original patch region names that I specified in the 2 STL files. As you can see from above I currently end up with names along the lines of "cellZone A_to_cellZoneB". This test case only had two region patches in each of the 2 closed STL files so a simple renaming operation could be used. However, if each of the 2 closed STL files had 6 region patch names (i.e. 1 per box side) then I think you would still only get the above list of resulting patches? Am I correct in thinking that sHM cannot use many separate STL files to do multi region meshing, unless the separate regions are wholely contained inside a single closed volume stl file? So if you had a box shaped region that you wanted meshed and this was contained in 2 separate stl files this would not work. Thank you for any help or assistance you can give me! geometry { fluid_box01.stl { type triSurfaceMesh; //cannot use name with regions // name fluid_box01; regions { box01_box01 // Named region in the STL file { name box01_box01; // User-defined patch name } box01_baffle01 { name box01_baffle01; } } } fluid_box02.stl { type triSurfaceMesh; //cannot use name with regions // name fluid_box02; regions { box02_box02 // Named region in the STL file { name box02_box02; // User-defined patch name } box02_baffle02 { name box02_baffle02; } } } }; . . . refinementSurfaces { fluid_box01.stl { // Surface-wise min and max refinement level level (1 1); faceZone fluid_box01_fz; cellZone fluid_box01_cz; zoneInside true; regions { box01_box01 // Named region in the STL file { level (1 1); // User-defined patch name } box01_baffle01 { level (1 1); } } } fluid_box02.stl { // Surface-wise min and max refinement level level (1 1); faceZone fluid_box02_fz; cellZone fluid_box02_cz; zoneInside true; regions { box02_box02 // Named region in the STL file { level (1 1); // User-defined patch name } box02_baffle02 { level (1 1); } } } } . . . |
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May 17, 2013, 18:01 |
Nobody knows the solution?
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#2 |
New Member
Jackie Chou
Join Date: Mar 2013
Posts: 12
Rep Power: 13 |
I had the same problem. Could anybody give some solution? thanks a lot!
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May 19, 2013, 07:08 |
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#3 |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,982
Blog Entries: 45
Rep Power: 128 |
Greetings to all! Jackie, welcome to the forum!
@Jackie: I got your email about this thread. I know I've either answered to this question in the past or I've already seen the answer in the forum. But after 15 minutes of searching, I can't find it. Either way, try reading the following threads for ideas:
Bruno
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May 19, 2013, 07:33 |
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#4 |
Member
Daniel Pielmeier
Join Date: Apr 2012
Posts: 99
Rep Power: 14 |
I want do do the same thing with sHM and I searched the forums up and down but could not find a solution.
I think original patches are preserved if there is one region and a blockMesh which is larger than than the actual geometry but not if you have multiple regions. I tried with a simple test case, a short pipe with only a subset of the solid walls as separate patch where a heat flux should be applied but the original patch is not preserved by sHM. I can share the case and upload it next week if anyone wants to take a look at it. |
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May 19, 2013, 20:13 |
Thank you so much!
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#5 | |
New Member
Jackie Chou
Join Date: Mar 2013
Posts: 12
Rep Power: 13 |
Quote:
it's really kind of you! I read your recommended post. That's quite nice and useful. I will try it and give you the feedback. regards, Jackie |
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multi, patch, recovering, region, snappyhexmesh |
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