DefinePK

Abstract

The study was carried out to examine, probe and approximate the flow fields around a submerged hydrodynamic structure, using an acoustic Doppler velocimeter. In the experimental setup a cylinder of 5 cm diameter was placed at a distance of about 5.5 cm away from another bluff body or a hydrodynamic structure, that is a vertical plate of 5 cm width, both acting as obstructions to the flow. To carry out the experiment in a recirculating flume, water flow of 52 lps and flow depth of 20 cm were maintained. The study was carried out in turbulent flow conditions and vortex formation was expected around the cylinder. The ADV helped to determine the velocity and its direction while vortices were being created around the cylinder and in its wake, and also to record the velocity and observe its characteristics in the boundary layer. With the determination of flow fields of the underwater composite hydrodynamic structures various other environmental issues come into play. This types of under-laying structures not only helps in dispersion of sediment decomposition in the river bed but also in this juncture help to get a free passage and movement area for aquatic fauna for a shallow type of water channel. Seeing so many advantages of this type of study could really boost to maintain aquatic ecological balance in addition to the territorial environment and socio-economic development.