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April 2, 2014, 20:41 |
Meshing Layers over Aerofoil
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#1 |
New Member
Craig Miller
Join Date: Mar 2014
Posts: 3
Rep Power: 12 |
Good evening.
Looking for some assistance in solving an issue I am having when trying to add layers to a mesh around a naca0012 aerofoil. I am currently trying to model the naca0012 foil as per the nasa validation case but I'm finding my Cd values to be way higher than expected and I believe this may be due to a poor mesh. I am modelling a naca0012 aerofoil initially using the standard blockmesh then the surfaceFeatureExtract tool then snappyhexmesh. The aerofoil is 3D but I am only taking a thin slice of it in the blockmesh and have defined only one division in the z direction. When in snappyhexmesh, I am trying to add boundary layers around the surface of the aerofoil but I am having particular difficulty in gaining smooth layers particularly around the trailing edge. I appreciate as it is a sharp edge then the snappyhexmesh tool can struggle but so far I have tried adjusting; the finalLayer size number of layers featureAngle adding an extra refinement region around the trailing edge refining the initial blockmesh reducing the sharpness of the edge With adjusting all these I can occasionally get smooth layers but these tend to be skewed as I then rotate the aerofoil through varying angles of attack. I have attached two pictures, the first shows the leading edge with consistent layers like I am trying to achieve then the 2nd shows the typical problem on the trailing edge where the layers don't fully generate and create skewed cells. If anyone has any suggestions for how to improve these then please point me in the right direction. |
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April 3, 2014, 04:30 |
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#2 | ||
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Julian Langowski
Join Date: May 2011
Location: Bremen, Germany
Posts: 91
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Dear Craig,
Quote:
Quote:
Best regards Julian
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πάντα ῥεῖ - Heraclitus |
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April 3, 2014, 13:29 |
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#3 |
New Member
Craig Miller
Join Date: Mar 2014
Posts: 3
Rep Power: 12 |
Julia,
Thanks for the response. Surely I need to use snappy so as to gain a more refined mesh in and around just the aerofoil as opposed to refining the whole domain? Bearing in mind that I have a rather large block mesh so as to deal with farfield boundaries. When you refined your block mesh, what level of y+ did you aim to work with? Thanks Craig |
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April 3, 2014, 13:46 |
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#4 | ||
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Julian Langowski
Join Date: May 2011
Location: Bremen, Germany
Posts: 91
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Dear Craig
Quote:
Quote:
Best regards Julian
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πάντα ῥεῖ - Heraclitus |
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April 3, 2014, 16:01 |
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#5 |
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Niels Nielsen
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Location: NJ - Denmark
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Linnemann PS. I do not do personal support, so please post in the forums. |
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April 4, 2014, 11:41 |
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#6 |
New Member
Craig Miller
Join Date: Mar 2014
Posts: 3
Rep Power: 12 |
Thank you for the responses. I will try what you have both suggested.
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