[snappyHexMesh] defining non-cubic blocks to toposet

sarajamali · August 4, 2017, 09:55

Dear all,
I am beginner in openfoam and would be thankful to have your recommendations.
i want to define some blocks in toposet which are not rectangular cubes, they are Trapezoid cubes, so i cant use boxtocell . how can i define my blocks in toposet?
Thanks

Antimony · August 15, 2017, 06:35

Hi,

Perhaps the option "rotatedBoxToCell" meets your requirements?

https://openfoamwiki.net/index.php/TopoSet

Cheers,
Antimony

sarajamali · August 26, 2017, 06:00

Quote:

Originally Posted by Antimony

Hi,

Perhaps the option "rotatedBoxToCell" meets your requirements?

https://openfoamwiki.net/index.php/TopoSet

Cheers,
Antimony

Hi Antimony,
thanks a lot for your response, i tried "rotatedBoxToCell", for some special cases it works, but it doesn't meet what i want exactly, or maybe its better to ask how can i define a pyramid region to toposet?

Antimony · August 26, 2017, 23:58

Hi,

I don't think there is a way to define a pyramid region directly in topoSet. The only reference to pyramids that I could find was on choosing by cell shape type (hex or pyr or tet etc).

If you know how and where exactly the pyramid should be, you could perhaps do one of two things:

1. Create a STL of the pyramid and use surfaceToCell to create cellSet based on the pyramid STL

2. Break your pyramid into many "boxes" and repeatedly use boxToCell or rotatedBoxToCell as the case maybe. This would again, provide only an approximation, but might still be doable.

Hope this helps/

Cheers,
Antimony

sarajamali · August 29, 2017, 10:41

Dear Antimony,
thanks for your comment, I try the first method you mentioned.

Regards
Sara

August 4, 2017, 09:55	defining non-cubic blocks to toposet	#1
sarajamali New Member sara jamali Join Date: Jul 2017 Location: Iran Posts: 3 Rep Power: 9	Dear all, I am beginner in openfoam and would be thankful to have your recommendations. i want to define some blocks in toposet which are not rectangular cubes, they are Trapezoid cubes, so i cant use boxtocell . how can i define my blocks in toposet? Thanks

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August 15, 2017, 06:35		#2
Antimony Senior Member Join Date: Aug 2013 Posts: 407 Rep Power: 16	Hi, Perhaps the option "rotatedBoxToCell" meets your requirements? https://openfoamwiki.net/index.php/TopoSet Cheers, Antimony

August 26, 2017, 23:58		#4
Antimony Senior Member Join Date: Aug 2013 Posts: 407 Rep Power: 16	Hi, I don't think there is a way to define a pyramid region directly in topoSet. The only reference to pyramids that I could find was on choosing by cell shape type (hex or pyr or tet etc). If you know how and where exactly the pyramid should be, you could perhaps do one of two things: 1. Create a STL of the pyramid and use surfaceToCell to create cellSet based on the pyramid STL 2. Break your pyramid into many "boxes" and repeatedly use boxToCell or rotatedBoxToCell as the case maybe. This would again, provide only an approximation, but might still be doable. Hope this helps/ Cheers, Antimony

August 29, 2017, 10:41		#5
sarajamali New Member sara jamali Join Date: Jul 2017 Location: Iran Posts: 3 Rep Power: 9	Dear Antimony, thanks for your comment, I try the first method you mentioned. Regards Sara