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[ANSYS Meshing] 2D problem in ICEM CFD

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Old   September 5, 2016, 08:32
Default 2D problem in ICEM CFD
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Prikane
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Dear colleagues,

I am currently trying to create 2D structured quad mesh between 2 surfaces (upper - cylindrical surface and bottom - flat surface) as you can see on the picture 1 given in attachment.

Since upper surface is cylindrical I have problem with highly skewed cells in the contact area, as you can see on the picture 'detail A' that is given in attachment. I need to say that minimum gap between these two surfaces is 1e-7 [m]. I tried to use O grid but without success, so if anyone how some suggestions I would be very grateful.

Thanks in advance,

Prikane
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Old   September 9, 2016, 02:21
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Does anyone can help me?
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Old   September 9, 2016, 16:55
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B.H.
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Well, you could try meshing the areas containing the highly skewed cells with an unstructured mesh. Or maybe try to cut your block and created a section of O-grid in that same area. Hope that at least starts you down the right path!
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Old   September 9, 2016, 18:33
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Sebastian Engel
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Hi Prikane,

i think a problem is that the edge params of the straight edge and the arc edge are not the same. If they would, then the vertical sides of the elements would be perpendicular.

I know there is also a function to match the bunching between two sets of edges. Maybe check the help. I can't recall any more detail now.

You may also have a look at this thread http://www.cfd-online.com/Forums/ans...nnlar-gap.html
to prevent other problems with small elements.

With regards,
Sebastian
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Old   September 10, 2016, 04:35
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Dear Niablis and Bluebase,

Thank you very much for your replies.

Niablis, the highly structured mesh with quad elements is desirable type of the mesh because I am planing to apply dynamic mesh on the cylindrical surface. This type of the mesh is also recommended in the literature on which I am relying for this project. For my project, I need to get mesh as it is shown on 'Picture 1' given in attachment, with perpendicular vertical mesh, so in my opinion, I can not use O grid and as Bluebase said, the problem must be with edge parameters on the cylindrical or flat edge.

Bluebase, the edge parameters on the cylindrical and flat surface are the same, as you can see on the 'Picture 2' which is given in attachment. But when I run premeshing, vertical mesh on the cylindrical surface follows its curvature and that is why I have this problem. For instance, if I take that the bottom surface is also cylindrical, the problem will be solved, as you can see on the 'Picture 3' given in attachment.

But, I need to take that the bottom surface is flat and then I have a problem with highly skewed cells.

Hope to hear from you soon.

Best regards,
Prikane
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Old   September 19, 2016, 02:37
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2d mesh, cylindrical surface, flat surface, icemcfd, quad mesh

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