﻿ 透风型挡风板不同孔隙度大小防风特性的二维数值模拟

# 透风型挡风板不同孔隙度大小防风特性的二维数值模拟Numerical Simulation of Wind Characteristics of the Windshield under Different Sizes of the Porosity

Abstract: Through the establishment of two-dimensional incompressible unsteady flow N-S equation, we solve the N-S equation with the use of variational multiscale methods, make numerical simulation of the wind field for different porosities and aperture ventilated wind screen and study the influence of ventilated wind screen under different porosities and aperture and non-ventilated wind screen on wind field. The results show that the wind screen has great wind resistance characteristics and the wind resistance effect of ventilated wind screen with appropriate porosity is better than that of non-ventilated wind screen. At the same time, the influences of wind screen with different porosities are significantly different and the wind screens with the same porosity but different apertures also have obvious differences. Under this experiment, the porosity is 20% while the aperture is 0.5 cm and the height is 50cm. The wind screen has great wind resistance charac-teristics, forming about 198 cm posterior vortex length in the wind field with the height of 200 cm and the length of 500cm. The vortex length is significantly longer than that of other ventilated wind screen.

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