Experimental and Numerical Modeling of Open Channel Flow in Various Cross-Section

Abstract

In this study, the flow that interacts with the trapezoidal head structure, which constitutes the narrowing and expansion section in the open channel, has been investigated experimentally and numerically. In experimental studies, the velocity field and flow profiles are measured using Acoustic Doppler Velocimeter (ADV) and limnimeter, respectively. In numerical modeling, different turbulence closure models have been tested for their success in estimating the velocity field and free surface profile. In the evaluation of the model performance to predict experimental results, Mean Square Error (MSE) and Mean Absolute Relative Error (MARE) parameters are used. Grid Convergence Index (GCI) method is used to determine the mesh density and the Volume of Fluids (VOF) method is used to determine the free surface profile. As a result of the study, it is determined that DES model is more successful than used other models in determining velocity field and flow profile according to MSE and MARE.

Keywords

• open channel flows
• acoustic doppler velocimeter
• various cross-section computational fluid dynamics
• velocity field