No abstract

No abstract

Electrical energy is harnessed from various natural sources to protect the environment and ecology which is termed as green energy sources. When vortex is induced on a cylinder, it starts vibrating according to the formation of vortex. The vibration is so strong that it can destroy any structure wherever alternating vortex is induced. Currently Vortex Induced Vibration is used to harness electrical energy from ocean, river and shallow water channel. In this paper, experimental investigations were conducted in flume to analyse the behaviour of underwater flow structures around a 5 cm horizontal cylinder placed transversely to the flow at 60% and 70% depths from water surface and simultaneously a 5 cm wide vertical end plate set at 8 cm downstream from cylinder. Fluctuating 3D velocity components around such plate cylinder combination were measured. From subsequent plotted contours, changing flow patterns in presence of vertical plate are analysed. Hydrodynamic flow features are shown by plotting absolute velocity fields and velocity vectors. It visualizes that streamlines separate first and then passes over the periphery of horizontal cylinder. The contour of turbulence kinetic energy confirms the presence of strong vortex in between horizontal cylinder and vertical plate. The horseshoe vortex at the upstream of cylinder becomes stronger due to the presence of vertical plate. The results from these two experiments are compared with the results observed in previous researches. With the increase in cylinder depth from water surface, the horseshoe vortices strength becomes stronger.

No abstract

. The flow pattern on the combined effect of a horizontal cylinder and a vertical plate is observed and analysed in this experimental study. The experiment was conducted with a 4 cm outer diameter cylinder arranged horizontally across flow above 2 cm from the bed and a vertical plate of 5 cm placed 9 cm downstream from cylinder surface reference as tilting flume bed surface. The water depth was maintained at 17 cm through a constant discharge of 35 lps in a re-circulating flume. Acoustic Doppler Velocimeter (ADV) was used to store the velocity fluctuation of velocity components and further used as a pictorial frame to understand the turbulence and the turbulent kinetic energy around the cylinder, plate and in between the cylinder - vertical plate. From the pictorial contour diagrams drawn, the velocity vector represents the flow feature over the cylinder and it is found that a horseshoe vortex, developed upstream of the plate, does effect on turbulent kinetic energy formed in between cylinder and vertical plate. The observation and obtained results from present study is compared with a 5 cm horizontal cylinder above 2 cm from the bed and a plate situated on 5.5 cm from cylinder curvature towards downstream.