الفهرس 
chapter 1Only 14 pages are availabe for public view
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Abstract
Porous wind fences were recommended as an effective control method of aeolian sand transport. The present study investigates different designs of constant and variable porosity wind fences on the fence performance. Average Navier-Stocks equations describing air flow field enclosed with the RNG k-ε turbulence model were dedicated for the present simulation. Numerical simulation model based on finite volume technique was employed. PHOENICS 2006 CFD solver is used for the numerical solution of the simulation model. Flow regime behind wind fences was analyzed for different proposed cases. Two and three segments of variable porosity wind fences were tested and compared with the 30% constant porosity wind fence. A fence design with three segments variable porosity in which the lower segment has 20% porosity, the middle segment 30% and the higher segment 40% porosity, (L20M30H40), is found to be the more effective one providing the highest performance for typical studied Reynolds numbers.