期刊
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
卷 45, 期 -, 页码 33-40出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2013.11.007
关键词
Turbulence; Wall-bounded flows; Direct numerical simulation
资金
- Australian Government
- Australian Research Council
Direct numerical simulations of turbulent pipe flow were performed at four Reynolds numbers: Re-tau = 180, 500, 1002 and 2003. Beyond Re-tau = 1000 viscous scaling holds near the wall for the mean velocity, Reynolds shear stress and wall-normal velocity variance. Streamwise and spanwise velocity variances do not exhibit inner (viscous) scaling due to increasing large-scale energy contributions. A comparison with channel and boundary layer DNS data shows negligible statistical differences between pipes and channels, whereas the transverse velocities for pipes/channels are significantly different when compared with boundary layers. A further comparison displays that the boundary layer pressure fluctuations is greater than pipes/channels. In addition, is it shown that the higher pressure fluctuations in the boundary layer is not the sole mechanism responsible for a stronger wake region in the flow. (C) 2013 Elsevier Inc. All rights reserved.
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