Initial relaxation of spatially evolving turbulent channel flow with blowing and suction

Citation
Ym. Chung et Hj. Sung, Initial relaxation of spatially evolving turbulent channel flow with blowing and suction, AIAA J, 39(11), 2001, pp. 2091-2099
Citations number
23
Categorie Soggetti
Aereospace Engineering
Journal title
AIAA JOURNAL
ISSN journal
00011452 → ACNP
Volume
39
Issue
11
Year of publication
2001
Pages
2091 - 2099
Database
ISI
SICI code
0001-1452(200111)39:11<2091:IROSET>2.0.ZU;2-X
Abstract
A direct numerical simulation is performed to examine the initial relaxatio n of spatially,evolving turbulent channel flow subjected to uniform wall bl owing and suction. Just beyond the entrance section, a uniform blowing is a pplied at the lower wall and a uniform suction at the upper. The relaxation processes of the mean velocity, turbulence intensities, Reynolds shear str esses, and vorticity fluctuations after the sudden wall blowing and suction are scrutinized. The effect of wall blowing and suction on the location an d strength of the streamwise vortices is significant. The relaxation associ ated with suction is much slower than that with blowing. The initial relaxa tion is evaluated in terms of the turbulent kinetic energy transport. Blowi ng enhances the intercomponent energy transfer between the Reynolds stresse s, whereas suction suppresses it.