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[Other] Overset Meshes - relative resolution of boundary layer

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Old   June 24, 2020, 08:23
Default Overset Meshes - relative resolution of boundary layer
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Mike Worth
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I'm trying to set up a simulation using overset meshing (overInterDyMFoam), and am seeing spurious high velocities that only seem to appear when I add boundary layers to my mesh around a moving object.

I'm wondering if this is due to interpolation issues between the large ~2mm background mesh cells and the flat (high aspect ratio) ~5um boundary layer cells. It's hard to see what's going on, but I think that the high velocities start off near the 'hole wall' interpolation surface.

Out at the overset boundary, cells are near-enough the same size on the two meshes, but obviously this won't be the case next to the hole. I've seen generic comments around keeping cell sizes similar, but have also seen examples using boundary layers; surely smaller boundary layers are supported?

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