Turbulent anisotropy and length scale variation over multiple shaped structure

Abstract

The turbulent flow characteristics over bed-mounted three different cubical shape bluff bodies is examined experimentally in the water channel facility. The steady and fluctuating flow fields are investigated to analyse the effect of corner radius and shapes of the bluff body on turbulent flow structure, particularly in the wake region. It is found that the sharp corner region, significantly impacts the flow separation and alters the characteristics of the shear-layer flow. In particular, the relatively subtle change in geometry resulted in a remarkable variation of the mean flow in the wake is observed. The anisotropic nature of flow is analysed using the turbulence triangle for the different cubical structures. The variation of the turbulent length scales are presented in the near and far wake region of the submerged obstacles.