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[ANSYS Meshing] Error: degenerate to an invalid element

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Old   June 12, 2018, 11:06
Default Error: degenerate to an invalid element
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Bhupinder Singh Sanghera
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Hi,

I am trying to simulate the transonic flow around an NACA 64A10 airfoil for an assignment. For this, I have one coarser mesh (y plus between 20 and 200) and one refined mesh (y plus below 1). I use the SST turbulence model.

The coarser mesh seems to work. After that, I try to change the exponential spacing (exp2 function) to a value of 1.5e-6 at the wing surface which is a guess to obtain a y plus distribution below 1. However, when I open CFX pre in the workbench for the new y plus distribution, I get an error saying:

'There was a problem importing the mesh from the requested file.
The importing process reported the following problem:

Hexahedral Element 18036 will degenerate to an invalid element:
NodeIDs: 28651, 28531, 28532, 28652, 28651, 36587, 36588, 28652'

I have been trying to fix this error for a while but did not manage yet. Help is much appreciated. Thanks.
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Old   November 11, 2018, 20:50
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Daniel
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Quote:
Originally Posted by Sanghera View Post
Hi,

I am trying to simulate the transonic flow around an NACA 64A10 airfoil for an assignment. For this, I have one coarser mesh (y plus between 20 and 200) and one refined mesh (y plus below 1). I use the SST turbulence model.

The coarser mesh seems to work. After that, I try to change the exponential spacing (exp2 function) to a value of 1.5e-6 at the wing surface which is a guess to obtain a y plus distribution below 1. However, when I open CFX pre in the workbench for the new y plus distribution, I get an error saying:

'There was a problem importing the mesh from the requested file.
The importing process reported the following problem:

Hexahedral Element 18036 will degenerate to an invalid element:
NodeIDs: 28651, 28531, 28532, 28652, 28651, 36587, 36588, 28652'

I have been trying to fix this error for a while but did not manage yet. Help is much appreciated. Thanks.

I'm having exactly the same problem as you right now. I believe you were also working on AE4202?


Did you eventually manage to fix the problem?
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Old   November 11, 2018, 21:34
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Daniel
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I found a solution just now. In the "Import Mesh" window, under "Advanced Options" select "Ignore Invalid Degenerate Elements". I don't know what this actually means tbh but I finally managed to import my mesh and my simulation converged nicely and the results make sense, so that's nice!
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