Title: Three Dimensional Numerical Modeling of Flow around Bridge Piers Using LES and RANS
Abstract:Details are given of a three-dimensional numerical model study to simulate the turbulent flow around a vertical circular pier. The developed model is based on the solution of fully three- dimensional ...Details are given of a three-dimensional numerical model study to simulate the turbulent flow around a vertical circular pier. The developed model is based on the solution of fully three- dimensional hydrodynamic equations. These equations can be achieved with two different methods, in- cluding:-1) Reynolds Averaged Navier-Stokes equations (RANS) and 2) Space Averaged Navier-Stokes equations. For the turbulence models the two-equation standard k-e model of RANS type and the Smago- rinsky model of large eddy simulation (LES) type have been deployed for each set of the hydrodynamic equations. The governing equations were discretized using the structured mesh of cell-centered collocated finite volume method, with the convection and diffusion terms being discretized using the third order up- wind and second order central schemes, respectively. Also in order to discretize the temporal terms a five- stage forth-order accurate Runge-Kutta scheme has been used. The pressure-velocity coupling has been achieved using the artificial compressibility method. Based on extensive numerical tests, the capability and the performance of the LES and RANS models have been validated against experimental data. Then, the numerical model results of the velocity, pressure and bed shear stress fields were compared with the available two sets of experimental data. The numerical model results showed that the length and intensity of the wake and also the horseshoe vortices are mainly affected with the turbulence models used.Read More
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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Cited By Count: 12
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