FLOW ANALYSIS AROUND SPURS OF DIFFERENT PERMEABILITY USING ANSYS FLUENT

Abstract

ABSTRACT Spurs are installed along the river side and are used for various purposes including flow and erosion control and bank protection. The influence factors of spur are largely related to the stream characteristics, hydrologic variables, hydraulic characteristics and local variables. So the analysis considering all the factors becomes difficult. Therefore most of the researches have been focused on the local scour at the tip of the spurs, flow pattern near spurs and separation length. In this study a single spur has been analysed using ANSYS Fluent software. The turbulence model used was standard k-epsilon model for the flow. Four different lengths of spurs were taken i.e. 0.2m, 0.3m, 0.4m, 0.5m and each of five different permeabilities i.e. impermeable, 20%, 40%, 60% and 80%. Three different approach velocities were taken i.e. 0.25m/s, 0.30m/s and 0.40m/s. So in total 60 different combinations of cases were analyzed and compared with the experimental data obtained by Yeo et al. The tip velocities and separation length were compared with the experimental data. Multiple linear regression has been used to see the relationship and correlation between the tip velocities, maximum velocities, permeability of spurs, area ratio of spurs, maximum bed shear stress and separation length. The best permeability of spur that can be used has been found using the results of separation length and maximum bed shear stress