Numerical Simulation And Experiment On The Sand Saltation Trajectory

There are two parts in this paper: using CFD universal software to simulate the sand dynamics to discuss where the Saffman lift force and turbulence influence the sand trajectory and comparing with experiments date which provided by Wang-David and Yang-bin Doctors in Xi-an Jiao Tong University Energy & Power Engineering who did the experiment in Flow Control & Bio fluid Laboratory of Korea Pohang University of Science and Technology Engineering, at the same time getting the relationship between experiment and experiments, and testifying the reliance of numerical simulation.At first, choosing suitable Disperse Model to describe the Lagrangian simulation model, and using optimum method of Stochastic Trajectory Model to simulate influence of Saffman lift force and turbulence impulse to sand saltation trajectory. Drawing a conclusion: the Saffman lift force will be neglected in sand saltation trajectory;Then the influence of turbulence impulse will be noticeable with diminishment of sand diameter at the same velocity, at the sand diameter range of 500um — 200um, the influence of turbulence can be omitted. When sand diameter is less than 160um, the track will be convex and not smooth, but remain saltation conditions and from now on considering the influence of track to turbulence impulse, at the same time getting the relationship of the sand diameter and saltation length and height.For the experimental data which obtained in Experimental Flow Control & Bio fluid Laboratory in Pohang University of Science and Technology by doctors in School of Energy & Power Engineering. Making comparison of simulations and experiments, themaximum error is 10%, and get the relationship between experiment zoand simulation z0, attesting the relationship between complicated sand track and reverse jump against wind direction to be correct, and also testifying the reliance of numerical simulation.