High order lagrangian velocity statistics in a turbulent channel flow with Reub>蟿 ub> = 80
- 作者：Jian-ping LUO
- 关键词：Lagrangian scaling exponents ; intermittency ; turbulent channel flow
- 刊名：Journal of Hydrodynamics ; Ser. B
- 出版年：2012
- 期刊代码：8_10016058
- 类别：et
- 出版时间：April, 2012
- 卷：24
- 期：2
- 页码：287-291
- 文件大小：392 K
摘要
The scaling properties of high-order Lagrangian velocity structure functions are investigated numerically for a turbulent flow with a friction-velocity based Reynolds number Reub>蟿 ub> = 80. The Lagrangian particles are released from locations of different distances to the wall. The relative scaling exponents of the longitudinal velocity component are found to increase with the released distance to the wall and to approach asymptotically to theoretical predictions. However, the scaling exponents of the transverse velocity component are smaller than , indicating a more intermittent nature. Specifically for the release locations in the center region, the relative scaling exponents agree very well with theoretical predictions.