How can I reduce the mesh skewness?

- June 22, 2020 at 4:48 pm
  
  Sorte
  Subscriber
  
  I'm trying to validate some wind tunnel simulations. My geometry consists in 5 spires at the entrance of the wind tunnel, and various roughness elements (square blocks) at the surface of the wind tunnel. I attach the print of my geometry.
  
  I have already tested different methods and sizes of the elements, but I could only achieve this: skewness Min 1.31E-10, Max 0.99842, Average 0.21809. The orthogonal quality is Min 1.58E-03, Max 0.99999 and Average 0.78044.
  
  How can I reduce my skewness?
  Thanks
- June 23, 2020 at 4:13 am
  
  Keyur Kanade
  Ansys Employee
  
  if you are going to use fluent, please check orthogonal quality. if min ortho quality is greater than 0.1 then your mesh is good.
  
  please find the locations of bad elements. please check following video.
  
  then apply different sizing at those locations. in some cases you may need to modify geometry at those locations.
  
  Regards,
  
  Keyur
  
  If this helps, please mark this post as 'Is Solution' to help others.
  
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- June 23, 2020 at 4:14 pm
  
  Sorte
  Subscriber
  
  Thank you Keyur for your answer. Yes, I will use Fluent.
  
  The orthogonal quality of this mesh is Min 1.58E-03, Max 0.99999 and Average 0.78044. What do you think about this?
  
  I identified that the spires are the ones that present the bad elements, as you can see below.
  
  How can I apply different sizes in these specific locations?
  
  If that doesn’t solve the issue, I can try to modify the geometry in these locations, as you suggested, but I am not sure how to do that as well…
  
  Thanks, Sorte
- June 24, 2020 at 2:32 am
  
  Keyur Kanade
  Ansys Employee
  
  best way is to modify geometry.
  
  if you want to change sizing, please see below.
  
  Regards,
  
  Keyur
  
  If this helps, please mark this post as 'Is Solution' to help others.
  
  Guidelines on the Student Community
  
  How to access ANSYS help links
- June 24, 2020 at 10:16 am
  
  Sorte
  Subscriber
  
  Thank you for your reply. How can I modify the geometry?
  
  I am very new to this software, and I am trying to learn it in any possible way. Thank you in advance.
- June 24, 2020 at 10:35 am
  
  Rob
  Ansys Employee
  
  Go back to the Geometry tool. It will probably help if you do the tutorials that come with the Help function.

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