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Aspect ratio in orthogonal mesh

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Old   June 14, 2014, 10:33
Question Aspect ratio in orthogonal mesh
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Blaž Mikuž
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Hi,
I have a question related to discretization of Navier-Stokes equation in finite volume method. I would like to clarify myself the effect of large aspect ratio (AR) to accuracy of the results.
In complex geometries large AR of the mesh cells could give rise to high skewness of cells, which introduce some numerical errors related to interpolation of fields to faces. This is evident if the mesh is non-orthogonal whereas for the orthogonal mesh there is no such error even if AR is large. Am I right?
So, why should AR be kept low (about 1.05 or lower) in meshes used for LES simulations? Is this requirement related to numerical error of discretization or not?

Thanks!

Last edited by bmikuz; June 14, 2014 at 11:44.
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aspect ratio, discretization errors, les grid, navier-stokes

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