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Large eddy simulation of backward-facing step flow

✍ Scribed by Kobayashi, Toshio ;Morinishi, Youhei ;Oh, Keon-Je

Publisher: Wiley (John Wiley & Sons)
Year: 1992
Tongue: English
Weight: 514 KB
Volume: 8
Category: Article
ISSN: 0748-8025
DOI: 10.1002/cnm.1630080703

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✦ Synopsis

Recirculating flow around a backward-facing step is caIculated by large eddy simulation (LES). The reattachment length is found to be xR/H = 8 for a Smagorinsky constant of C = 0.15, and xR/H = 9 for C = 0.10. In the recirculating region, three eddy structures can be observed in the instantaneous streamline distributions, and the location of the reattachment point varies according to the size of these eddies. The stream-wise turbulence intensities at the start of the recirculating region around the step are considerably reduced by LES in comparison with the values predicted by the k -E model, but they have somewhat higher values than those of the kc model as it approaches the reattachment point.

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