Vortical Structures in High-Reynolds-Number Jet Indicating Edgetone Oscillation

Journal of Fluid Science and Technology

Yutaka KUKITA¹  Yuta KAWAI²  Yoshiyuki TSUJI³ 

[1] Science, Nagoya University;Aisan Industry Co., Ltd.;;Department of Energy Engineering &

关键词: edgetone;    coherent structure;    velocity gradient tensor;    low pressure;   

DOI  :  10.1299/jfst.2.665

来源: DOAJ

【 摘 要 】

Coherent vortical structures in a high-Reynolds number turbulent jet indicating edgetone oscillations are extracted from velocity and pressure data. Three statistical quantities are adopted as the candidate indicators of coherent structures; (i) phase-averaged vorticity, (ii) phase-averaged pressure, and (iii) phase-averaged velocity gradient tensor. All these quantities work well for extracting coherent structures in a test case of low-Reynolds number cylinder wake. However, when applied to the high-Reynolds number edgetone flow, (ii) and (iii) indicate much better performance than (i), because (i) is affected by the background time-averaged vorticity field. The advection speed of coherent structures is evaluated and compared with Powell's feedback mechanism.

【 授权许可】

Unknown