Graded mesh near two boundaries with genbox

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Michael Calkins

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Jul 19, 2025, 1:20:53 PMJul 19

to Nek5000

Hello,

I'm running three-dimensional simulations of Rayleigh-Bénard convection and I'd like to cluster (grade) the mesh near both the top and bottom boundaries. Is there a mechanism to do this with "genbox"? I see that setting the ratio in the .box file to less than unity will cluster near one boundary only. Any information would be appreciated. Thanks!

Michael

Chinthaka Jacob

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Jul 20, 2025, 5:36:11 PMJul 20

to Nek5000

Hi Michael,

I am not an expert on this, but one possible workaround might be to define two adjoining boxes, with the interior (E) boundary condition, along the vertical (top-bottom) direction: one with a ratio less than one (to cluster towards the bottom) and the other with a ratio greater than one (to cluster towards the top).