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

Tso Ren Wu, Philip L.F. Liu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Scopus citations

Abstract

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.

Original languageEnglish
Title of host publicationSelected Papers of the Symposium Held in Honor of Philip L-F Liu's 60th Birthday - Nonlinear Wave Dynamics
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages281-303
Number of pages23
ISBN (Print)9812709037, 9789812709035
StatePublished - 2009
Event2006 Symposium Held in Honor of Philip L-F Liu's 60th Birthday - Nonlinear Wave Dynamics - Ithaca, NY, United States
Duration: 1 Sep 20061 Sep 2006

Publication series

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

Conference

Conference2006 Symposium Held in Honor of Philip L-F Liu's 60th Birthday - Nonlinear Wave Dynamics
Country/TerritoryUnited States
CityIthaca, NY
Period1/09/061/09/06

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