INVESTIGATION ON TURBULENT STRUCTURE OF SEDIMENT FLOWS OF SINGLE SIZED PARTICLE BY USING THREE-DIMENSIONAL SOLID-FLUID MULTIPHASE SIMULATION

Abstract

 We performed three cases of three-dimensional numerical simulations of uniform sediment flows of single-sized particles in different slopes by using a solid-fluid multiphase simulation model and demonstrated that the sediment volume concentrations of the simulation results were able to agree with those obtained from the equation of the equilibrium sediment volume concentration. We also obtained spectrum of flow velocities at different heights by fourier analysis from the simulation results and investigated turbulent structure of sediment flows. The velocity spectrum showed that the peak of velocity spectrum was appeared near the free surface in the highly-concentrated sediment flows in the great slope channel. It was also demonstrated that the velocity spectrums in different scale was closer to each other near the free surface in highly-concentrated sediment flows compared with those in the low concentration sediment flows.