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Hi @Bkv-1915 |
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Regarding the spectrum, I just want to point out that the turb_channel example was never meant to meshed for getting good results. Rather we wanted to demonstrate the case setup and make it fast enough to run even on a consumer GPU. But based on your description, you remeshed yourself, or? I don't recall seeing such a build-up in the high frequencies for channels in my runs. I guess the expert on such matters is @pschlatt1 ! |
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Which tool did you use to do the interpolation? |
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Dear Neko team,
Greetings.
I recently ran turbulent channelf flow simulation using NEKO example case for:
Re_tau = 180,
Re_bulk = 2800,
Box mesh: 36,36,36 elements
Polynomial order: 5
Dealias: true
time_order: 3
Please see the attached figure of turbulent kinetic enrgy spectra obtained after interpolation to equispaced grid.
There is an energy pile-up at high wavenumbers. Is it common in SEM formulation for the above polynomial order and elements combination to observe such energy pile-up? or There is something else going on. Please let me know if this could be solved only by adding a LES model.
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