Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
655186 | International Journal of Heat and Fluid Flow | 2014 | 8 Pages |
Abstract
Direct numerical simulations of turbulent pipe flow were performed at four Reynolds numbers: ReÏ=180,500,1002and2003. Beyond ReÏ=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.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
C. Chin, J.P. Monty, A. Ooi,