Surface Pressure Variation Around Obstacle With Changing The Aspect Ratio
The study aims to understand the surface pressure distribution around the bodies such as the suction pressure in
the leading edge on the top and side-face when the aspect ratio of bodies and the wind direction are changed, respectively.
We carried out the wind tunnel measurement and numerical simulation around a series of rectangular bodies (40d×80w×80h,
80d×80w×80h, 160d×80w×80h, 80d×40w×80h and 80d×160w×80h in mm3) placed in a deep turbulent boundary layer.
Based on a modern numerical platform, the Navier-Stokes equation with the typical 2-equation (k-ε model) and the DES
(Detached Eddy Simulation) turbulence model has been calculated, and they are both compared with the measurement data.
Regarding to the turbulence model, the DES model makes a better prediction comparing with the k-ε model, especially when
calculating the separated turbulent flow around a bluff body with sharp edged corner. The result shows that the transverse
width has a substantial effect on the variation of surface pressure around the bodies, while the longitudinal length has little or
Keywords: Rectangular bodies, aspect ratio, surface pressure distribution, wind-tunnel measurement, CFD.