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3D LBM Numerical Analysis of the Behavior of Bed-Load Layer in Open Channel Shear Flow

Author(s): Lulu He; Wataru Kioka; Cuiping Kuang

Linked Author(s): Cuiping Kuang

Keywords: 3D movable bed; Bed-load transport; SGS turbulence; Open channel shear flow; LBM

Abstract: A three-dimensional numerical movable bed model based on Lattice Boltzmann Method (LBM) is established to simulate the behavior of bed-load layer in open channel shear flow, considering both the particle-particle interaction and particle-fluid interaction by using a link-bounce-back scheme. The 3D LBM model, originally from Ladd’s LBM for chemical particle-fluid suspensions, has been extended to free-surface flow and to higher Reynolds number regime. The Sub-Grid Smagorinksy (SGS) turbulence model is included in the LBM flow simulation. A series of numerical simulations with Shields parameters ranged between 0.01 and 0.42 is performed. The present model describes well the behavior of each particle in the bed-load layer both in saltation and sheetflow regimes. Results of the present simulation for the horizontal sediment particle velocities in bed-load layer and the existing probability density agree fairly well with Gotoh’s experimental data.


Year: 2014

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