[snappyHexMesh] In need of guidance to optimize snappyHexMeshDict for a rotor segment

ZachJa · August 8, 2015, 01:14

Hello,

I am trying to make snappyHexMesh for the following rotor segment with the following patches:
https://www.dropbox.com/s/im59eo76bc...tches.png?dl=0
However, my current snappyHM setup:
https://www.dropbox.com/s/ggjqomezqn...xMeshDict?dl=0
is not OK cause result mesh:
https://www.dropbox.com/s/1uotklsyxb...0mesh.png?dl=0
is not suitable for simulation.
How should I modify snappyHM setup to achieve smth like this:
https://www.dropbox.com/s/b8ipmjgztx...0mesh.png?dl=0
ie I need more homogeneous mesh distribution especially at outlet and periodic faces.

Thank you for any help!

ZachJa · August 15, 2015, 01:04

looks like blockMesh is important, especially for rotating geometry. I suppose that non-homogeneous mesh on radiused surfaces is because of quadratic blocks in blockMesh. I am wondering: is it possible to make blockMesh using cylinder (sector of cylinder) like this: https://www.dropbox.com/s/fuo4wdq116gmgo2/Cyl1?dl=0 instead of quadratic block?

danielpiaget · August 17, 2015, 11:11

Hello ZanJa,

See the link below where they have split up the domain for application in turbines and diffusers (hybraulic machinery) using blockMesh.

http://openfoamwiki.net/index.php/Si...nical_diffuser

See in particular section 1.6.

Note that they have used the utilty m4 to generate the blockMeshdict.

http://www.gnu.org/doc/doc.html

Good luck,

Daniel

August 8, 2015, 01:14	In need of guidance to optimize snappyHexMeshDict for a rotor segment	#1
ZachJa New Member Zach Join Date: Nov 2014 Posts: 6 Rep Power: 11	Hello, I am trying to make snappyHexMesh for the following rotor segment with the following patches: https://www.dropbox.com/s/im59eo76bc...tches.png?dl=0 However, my current snappyHM setup: https://www.dropbox.com/s/ggjqomezqn...xMeshDict?dl=0 is not OK cause result mesh: https://www.dropbox.com/s/1uotklsyxb...0mesh.png?dl=0 is not suitable for simulation. How should I modify snappyHM setup to achieve smth like this: https://www.dropbox.com/s/b8ipmjgztx...0mesh.png?dl=0 ie I need more homogeneous mesh distribution especially at outlet and periodic faces. Thank you for any help!

August 15, 2015, 01:04		#2
ZachJa New Member Zach Join Date: Nov 2014 Posts: 6 Rep Power: 11	looks like blockMesh is important, especially for rotating geometry. I suppose that non-homogeneous mesh on radiused surfaces is because of quadratic blocks in blockMesh. I am wondering: is it possible to make blockMesh using cylinder (sector of cylinder) like this: https://www.dropbox.com/s/fuo4wdq116gmgo2/Cyl1?dl=0 instead of quadratic block? Last edited by ZachJa; August 15, 2015 at 02:33.

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August 17, 2015, 11:11		#3
danielpiaget Member DanielP Join Date: Jan 2015 Posts: 33 Rep Power: 11	Hello ZanJa, See the link below where they have split up the domain for application in turbines and diffusers (hybraulic machinery) using blockMesh. http://openfoamwiki.net/index.php/Si...nical_diffuser See in particular section 1.6. Note that they have used the utilty m4 to generate the blockMeshdict. http://www.gnu.org/doc/doc.html Good luck, Daniel