FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
|
|
|
|
Experimental Investigation of Wake-Induced Bypass Transition Control by Surface Roughness |
PAN Chong, WANG Jin-Jun**, HE Guo-Sheng |
Key Laboratory of Fluid Mechanics (Ministry of Education), Beihang University, Beijing 100191
|
|
Cite this article: |
PAN Chong, WANG Jin-Jun, HE Guo-Sheng 2012 Chin. Phys. Lett. 29 104704 |
|
|
Abstract Surface roughness is experimentally used to control the flat-plate boundary layer bypass transition induced by an upstream convected two-dimensional (2D) circular cylinder wake. It is shown that the later stage of this bypass transition is successfully postponed, at the price of accelerating the earlier transition stage. A regularisation process of the hairpin vortices, which are the dominant coherent structures to promote the transition process, are observed under the influence of roughness elements. Significant scale reduction and localisation of these hairpins are achieved, which enhances the possibility of a hairpin self-annihilation process. Therefore, the cascade to large-scale structures in the later transition stage might be impeded/weakened.
|
|
Received: 20 February 2012
Published: 01 October 2012
|
|
|
|
|
|
[1] Tiederman W G, Luchik T S and Bogard D G 1985 J. Fluid Mech. 156 419 [2] Bechert D W, Bruse M, Hage W, Hoeven J G T V D and Hoppe G 1997 J. Fluid Mech. 338 59 [3] Choi K S 2002 Phys. Fluids 14 2530 [4] Lundell F 2007 J. Fluid Mech. 585 41 [5] Adrian R J 2007 Phys. Fluids 19 041301 [6] Chen S Y, Ecke R E, Eyink G L, Rivera M, Wan M P and Xiao Z L 2006 Phys. Rev. Lett. 96 084502 [7] Waleffe F 1997 Phys. Fluids 9 883 [8] Sirovich L and Karlsson S 1997 Nature 388 21 [9] Choi K S 2006 Nature 440 754 [10] Kachanov Y S and Tararykin O I 1987 Izv. Sib. Otd. Akad. Nauk SSSR, Ser. Tekh. Nauk. 18 9 (in Russian) [11] Fransson J H M, Talamelli A, Brandt L and Cossu C 2006 Phys. Rev. Lett. 96 064501 [12] Morkovin M V 1969 On the Many Faces of Transition in Viscous Drag Reduction ed Wells G S (New York: Plenum Press) pp 1–31 [13] Ellingsen T and Palm E 1975 Phys. Fluids 18 487 [14] Pan C, Wang J J, Zhang P F and Feng L H 2008 J. Fluid Mech. 603 [15] Wang J J, Zhang C and Pan C 2011 J. Visual. 14(1) 53 [16] Zhang C, Pan C and Wang J J 2011 Exp. Fluids 51 1343 [17] Scarano F and Riethmuller M L 2000 Exp. Fluids 29 S051 [18] Haller G 2001 Physica D 149 248 [19] Shadden S C, Lekien F and Marsden J E 2005 Physica D 212 271 [20] Haller G 2005 J. Fluid Mech. 525 1 [21] Pan C, Wang J J and Zhang C 2009 Sci. Chin. G 52 248 [22] Hon T L and Walker J D A 1991 Comput. Fluids 20 343 [23] Williamson C H K 1996 Annu. Rev. Fluid Mech. 28 477 |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|