Author(s): Priyanka Gautam, Thekkilakkattu Iype Eldho, Bijoy Singha Mazumder, Manasa Ranjan Behera
Linked Author(s): Priyanka Gautam
Keywords: Particle Image Velocimetry (PIV), Complex Bridge Pier (CBP), hydrodynamics, mean velocity, 3-D flow field
Abstract:
The objective of this paper is to study the velocity field around a Complex Bridge Pier (CBP) with elliptical shape of pile cap, through experimental research using Stereo-Particle Image Velocimetry (S-PIV). The complex bridge pier model consisted of three different components, viz. a cylindrical column resting on an elliptical shaped pile cap covering a 2x2 array of cylindrical piles. The three components of CBP are exposed to the flow in such a way that the contribution of each component could be obtained in generating the vortex system. Time averaged flow velocity U, V and W in the x-, y- and z- direction respectively are obtained from the PIV images and analyzed to understand the flow hydrodynamics around a CBP. Results shows that each of the three components of a CBP have individual effects on the flow pattern. The flow structure is vortical on the upstream of the CBP (below the pile cap) and downstream of the CBP (at the tail of pile cap) due to interfaces of different intensity velocity layers separating from the 3 pier components. On the upstream of CBP, the effect of pile cap can easily be seen in the form of a low velocity region around the nose of the pile cap. The effect of each component of CBP on the flow field is studied to identify the high gradient regions around the pier which leads to scour. (2606, 65, 315)
Year: 2017