3-D OPTIMUM ANALYSIS OF THE ENERGY DISSIPATING STRUCTURES IN SITILLING BASIN OF WEIRS BY USING COMPUTATIONAL FLUID DYNAMICS

Abstract

In this study, by using the Computational Fluid Dynamics Method (CFD), it was aimed to analyze the 5 different models of different positions of the energy dissipating structures planned in sipilling basin, according to the velocity and pressure of the water flowing from over a fixed weir body. Then, 4 different models which are created in the computer with real data of Type II model selected as Reference Model (Model 1) were compared. Model 2 has neither chut blocks nor energy dissipation blocks but has just end sill. Model 3 has a row chut block and end sill at the end of the stilling basin but has not got energy dissipation blocks. Model 4 has a row of energy dissipation blocks and end sill in the stilling basin but have not got chut blocks. Model 5 has a row chut block two row energy dissipating blocks in the stilling basin and end sill continuing along the body length at the end of the stilling basin. Different models were analyzed by using the Volume of Fluid (VOF) model in Ansys software. Then, flow patterns were created by determining the pressures, velocities and jump situations applied to energy dissipating blocks placed at different distances to the sipilling basin of the water flowing from over a fixed weir body. Thus, it has been attempted to determine the optimum model which is flow energy can dissipate the maximum among differently designed models. As a result of the simulation, Model 5 was found the optimum or best one among these five different models according to flow characteristics, in addition, the simulation’s output data obtained by Ansys Fluent matches with our Reference Model’s real data.