aspect ratio near wall and yplus requirement
Hi all,
I know this question has been asked before but I would like to get some confirmation (preferably in a reference if such a document exists!). In a simulation I need yplus to be one and this corresponds to a high aspect ratio of 1000 near the walls unless I include more nodes in the normal direction which would cost me a huge computational time. I've heard that aspect ratio is not that important in the near wall region. Is this correct? Would the value of 1000 still be acceptable? Cheers, Nick |
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I think the aspect ratio of 1000 is high and apart from solver stability issues, you may end up not capturing the right physics. In order to resolve the boundary layer Y+ is not the only criteria but you have to place adequate number of cells near wall to capture the boundary layer well. |
Thanks for the comments. I already have enough points in the streamwise direction to capture the Boundary Layer but I was wondering if the normal (into the wall) is important cause these are the nodes that would effect the aspect ratio in my case.
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I am talking about into the wall nodes (spanwise for example in external aerodynamics).
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