Optimization study of porous wind fence on reducing and stabilizing fluctuating pressure in the wake region

The sheltering effect of the porous wind fence on wind flow has been highlighted last several decades, which provides a tremendous reduction and stability of wind speed in vegetation area by changing the porosity. This study aims to examine a variety of the wind fence, which varies the porosity (i.e., ф = 0.1, 0.2, 0.3, 0.35, 0.4, 0.45, 0.5, 0.7) and the location of a porous fence placed in a simulated turbulent boundary layer. The sheltering effect was observed by the mean and fluctuating quantities such as velocity and pressure variation in the wake of porous fences. The study performed a numerical simulation by using a 2-equation RANS model such as k-ε turbulence closure models, k-ω SST, and LES models. The study analyzes wind and pressure characteristics behind wind fences under flat smooth surface as well as rough. In a preliminary result, the wind speed behind the wind fence decreased more than 50\% in the porosity 0.1-0.6, which is considered as the wind-protect (i.e., stable) area. In addition, the numerical predictions show good agreements with the existing experiments. Regarding optimum porosity, around 0.3-0.5 seems to be most effective in terms of reduction in wind speed and fluctuating pressure in the wake of wind fence.