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Zbl 1167.76338
Layton, William; Neda, Monika
Truncation of scales by time relaxation. (English)
[J] J. Math. Anal. Appl. 325, No. 2, 788-807 (2007). ISSN 0022-247X

Summary: We study a time relaxation regularization of flow problems proposed and tested extensively by Stolz and Adams. The aim of the relaxation term is to drive the unresolved fluctuations in a computational simulation to zero exponentially fast by an appropriate and often problem dependent choice of its coefficient; this relaxation term is thus intermediate between a tunable numerical stabilization and a continuum modeling term. Our aim herein is to understand how this term, by itself, acts to truncate solution scales and to use this understanding to give insight into parameter selection.

MSC 2000:: *76F65 Direct numerical and large eddy simulation of turbulence
35Q35 Other equations arising in fluid mechanics
76D05 Navier-Stokes equations (fluid dynamics)

Keywords: energy cascade; similarity theory; turbulence; deconvolution; time relaxation

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Zentralblatt MATH Berlin [Germany]