ライブラリ登録: Guest
TSFP DL Home アーカイブ 執行委員会
TSFP DIGITAL LIBRARY ONLINE


ISSN オンライン: 2642-0554

MODULATION OF NEAR-WALL ANISOTROPY WITH UNIFORM WALL BLOWING AND SUCTION

Yongmann M. Chung
School of Engineering and Centre for Scientific Computing University of Warwick Coventry CV4 7AL, UK

Hyung Jin Sung
Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea

要約

Direct numerical simulation data have been analysed to investigate the effect of uniform wall blowing and suction on the near-wall turbulence structure. Blowing is applied at the lower wall of the channel and suction at the upper wall, respectively. The modulation of the near-wall anisotropy with uniform wall blowing and suction is examined in terms of the anisotropy invariant map (AIM) for the Reynolds stress anisotropy tensor. It is found that blowing makes the flow more isotropic, enhancing transverse (v'2 and w'2) components of velocity fluctuations significantly. A significant increase in the anisotropy of the near-wall region is found in the suction case, making the flow approach towards a one-component state in the anisotropy invariant map. The AIM analysis indicates that the relaxation processes of the anisotropy of the near-wall turbulence are different for the blowing and suction cases.