Turbulent anisotropy and energy distribution over submerged cubical model

Abstract

A detailed investigation of turbulent flow characteristics over a wall-mounted submerged cubical model at multiple flow stages is carried out experimentally. Prolonged measurements of the velocity fluctuations are performed over submerged cube along the test section at three submergence ratios. The results are examined by looking at various aspects of turbulent flow structures such as the turbulence triangle, ratio of turbulent intensities, turbulence production, energy dissipation rate and length scales of fluctuations. The results show that the peak in turbulent kinetic energy (TKE) shifts with increases in submergence ratio, and concurrently, the value of TKE appears to decrease in magnitude. Further, with a decrease in flow depth, the free surface increasingly limits turbulent structures' upward propagation and growth. As a result, the peak of energy spectra at the near wake region decreases with increased submergence ratios.