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Surface represented incorrectly for NACA profile |
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April 13, 2021, 04:39 |
Surface represented incorrectly for NACA profile
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#1 |
New Member
Join Date: Mar 2021
Posts: 4
Rep Power: 5 |
Hello all
I am simulating flow over several Naca profiles. These have been drawn in Solidworks and saved as STEP files. I have this repeating problem for some of the profiles that looks odd at the leading edge (see figure) while the others don't. I have imported the step file with the "very fine" option and I have a well-refined mesh. The fin has the dimensions of: - Chord length: 27 mm - Width: 1.3 Mesh settings: - Prism layer Thickness: 2.0E-4 m - Prism layer number: 18 - Prism layer Stretching: 1.1 - Surface Curvature: 200 - Surface Growth Rate: 1.1 - Surface Proximity: 2 points in gap - Template Growth Rate: Very slow Do you have any suggestions on what I could try to improve the surface representation. |
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April 13, 2021, 07:13 |
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#2 |
New Member
Join Date: Mar 2011
Posts: 20
Rep Power: 16 |
Hi,
my guess is that its coming from the mesh. Should be easy to check for you. If its not the mesh, check your CAD to make sure its really clean and valid at the trailing edge. |
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April 13, 2021, 19:12 |
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#3 |
Senior Member
Chaotic Water
Join Date: Jul 2012
Location: Elgrin Fau
Posts: 436
Rep Power: 17 |
Surface Min Size, Surface Target Size?
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April 14, 2021, 02:39 |
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#4 |
New Member
Join Date: Mar 2021
Posts: 4
Rep Power: 5 |
I think you are correct, that the problem is caused by the mesh. I tried to alter the mesh in many different ways, and finally found that by choosing the following settings I can get a better (but not perfect) mesh:
Surface proximity = 100 Relative min size: 0.001 m Relative target size: 0.004 m The problem is now that all the surfaces in this region are refined, thus almost doubling the total number of cells for the simulation. Is there any way I could lower these three values only for the surface of the NACA profile, but not for all the surfaces in the region? I have tried to use the "Volumetric Controls" just over the wing, but it seems to only alter the volume mesh and not the surface mesh. Is that correct? |
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April 14, 2021, 03:58 |
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#5 |
New Member
Join Date: Mar 2021
Posts: 4
Rep Power: 5 |
I managed to solve the problem by the use of volumetric controls.
Thanks for your inputs, cwl and SESP |
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