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Checkerboarding problem in LES

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Old   June 9, 2009, 05:35
Default Checkerboarding problem in LES
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Matteo Baldi
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Hello,

I've been testing LES/DES models using the central differencing scheme for the convective term of the momentum equation, on some test-cases in which the flow encounters a bluff body (square cylinder; ribs in a channel). Despite adopting configurations and grids very similar to the ones employed in some works present in literature, the simulations I've been running suffer from the well-known problem of Checkerboarding, that presents itself in the velocity field (it persists even averaging in time) but not in the pressure field.
This frequent presence of checkerboarding is quite strange, considering that the central scheme employs the interpolation of Rie&Chow, which is just meant to avoid the problem.
I'd like to know if any of you has experienced such difficulties in using the central difference scheme in OF.

Thank you very much,

Matteo
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Old   June 10, 2009, 05:41
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Niels Gjoel Jacobsen
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This is tour third posting in a new thread since yesterday with the exact same wording. It will definitely not help you to get an answer, and furthermore your are cluttering the Forum with useless thread, so people following you, will have less change to find any relevant information.

Best regards,

Niels
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Old   June 11, 2009, 02:30
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Matteo Baldi
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Dear Niels,

I perfectly know how to behave correctly without your help ("your", not "tour"..);
if you look carefully my posts are 2, not 3, and the 2nd is a correction of the 1st, that's not just the same wording.. I did write the 1st thread twice, but only because I checked and the thread didn't appear among the new ones.

I'll be waiting for some useful contribution

My kindest regards.

Matteo
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Old   September 15, 2012, 22:15
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Tarak
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Hii Matteo,

I'm facing the same problem too, but I'm using linearUpwind as the convection scheme. Did you find any solution to your problem?

Thanks,
Tarak
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