Numerical study on the three-dimensional dambreak bore interacting with a square cylinder

Tso Ren Wu, Philip L.F. Liu

研究成果: 書貢獻/報告類型會議論文篇章同行評審

6 引文 斯高帕斯(Scopus)

摘要

The interaction between a dam-break bore and a vertical square cylinder is studied by using a Reynolds Averaged Navier-Stokes (RANS) model with a k - ε turbulence closure, a large-eddy simulation (LES) model, and direct numerical simulation (DNS). In all three numerical models the free-surface is tracked by the volume-of-fluid (VOF) method. Numerical results are compared with laboratory measurements in terms of the total force acting on the cylinder and the time history of velocity measured at a fixed point upstream of the cylinder. Overall, all three numerical models predict the force and velocity reasonably well, while the RANS model and LES appear to provide more accurate prediction during the period when strong turbulence is present. Based on the RANS model results, the turbulent intensity (TI), defined as the velocity fluctuation divided by the mean velocity, is in the range of 0.2 ∼ 0.4 in the wake zone behind the cylinder and 0.4 ∼ 0.8 in the plunging waves reflected from the end wall. The results from the RANS model and LES are compared with each other. The LES results reveal finer structure compared to the RANS results in terms of free-surface profiles and vorticities. The distribution of the vorticity field is similar to TI indicating that they are strongly correlated. The thin layer of water in front of the dam initially prevents the direct interaction between the bore and the bed. However, a series of vortexes generated by the edge of the square cylinder transports the water from the near bed region to the free surface.

原文???core.languages.en_GB???
主出版物標題Selected Papers of the Symposium Held in Honor of Philip L-F Liu's 60th Birthday - Nonlinear Wave Dynamics
發行者World Scientific Publishing Co. Pte Ltd
頁面281-303
頁數23
ISBN(列印)9812709037, 9789812709035
出版狀態已出版 - 2009
事件2006 Symposium Held in Honor of Philip L-F Liu's 60th Birthday - Nonlinear Wave Dynamics - Ithaca, NY, United States
持續時間: 1 9月 20061 9月 2006

出版系列

名字Selected Papers of the Symposium Held in Honor of Philip L-F Liu's 60th Birthday - Nonlinear Wave Dynamics

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???event.eventtypes.event.conference???2006 Symposium Held in Honor of Philip L-F Liu's 60th Birthday - Nonlinear Wave Dynamics
國家/地區United States
城市Ithaca, NY
期間1/09/061/09/06

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