Numerical Simulation and Wind Tunnel Experiment of Wind Field over Slope Surface
Current theoretical studies and numerical simulations of windblown sand movement concentrate on ideal circumstances,such as steady wind velocity,flat sand surface,etc.However,the environment of windblown sand movement is complex in natural environments,such as complex landform,turbulence structure of wind flow.Actually the gradient of the windward slope of the sand dune and the sand ripple etc.which are the basic form of the desert landscape,have great influence on the initiation and transportation of sand particles.In this paper,wind tunnel experiments are carried out and the wind velocity over slope surface is measured by using the Phase Doppler Particle Analyzer technique and the characteristics of wind flow at the windward slope and at the leeward slope are analyzed.Then the SIMPLE algorithm is applied to calculate the wind flow over the slope,and the numerical simulation results are compared with the experiment results.The results show that the numerical model can not only simulate the wind flow characteristics of the slope surface effectively,but also displays the wind field structures of windward slope and leeward slope intuitively and comprehensively.