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[ICEM] Change the grid size at the trailing edge of airfoil

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Old   August 21, 2020, 20:12
Exclamation Change the grid size at the trailing edge of airfoil
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Hello,

I used blocks to have a structured C-Type mesh for an airfoil. But now I have a problem. I need Y+ to be less than 1 on the first layer of boundary layer and this makes the first layer over the airfoil very thin, but this thin layer also goes after the trailing edge where the velocities are HIGH and this causes a high CFL number there. I just want the thin boundary layer mesh to be only around the airfoil and not after the trailing edge. I want the trailing edge mesh gets coarser (The area is shown in the image below). How can I do that?
Thank you in advance.
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Old   August 21, 2020, 20:44
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Quote:
Originally Posted by Moreza7 View Post
Hello,

I used blocks to have a structured C-Type mesh for an airfoil. But now I have a problem. I need Y+ to be less than 1 on the first layer of boundary layer and this makes the first layer over the airfoil very thin, but this thin layer also goes after the trailing edge where the velocities are HIGH and this causes a high CFL number there. I just want the thin boundary layer mesh to be only around the airfoil and not after the trailing edge. I want the trailing edge mesh gets coarser (The area is shown in the image below). How can I do that?
Thank you in advance.
What you need is a meshing strategy similar to Turbogrid's ATM. Basically it is a layer of blocks revolving the airfoil (the tip should have a minimal curvature, small enough to avoid affecting the results but big enough so that you can assign an edge association to it), a second layer of parallel blocks diverting to the sides and lots of auxiliary curves. Definitely not easy to make it in ICEM, but it is possible. Really tricky to explain here, though. A suggestion: try one of TurboGrid's tutorials with ATM strategy and observe how it organizes the blocks around the blade tips. Once you understand the strategy, try to do a similar approach in ICEM.

Good luck!
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Old   December 27, 2020, 02:51
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Hello,

Another method I think you could try is making a Y-grid with a 1/4 O-grid, as in the videos: http://www.youtube.com/watch?v=tYrbS...3&feature=plcp
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