Comparison of Flow over Broad Crested Weir in Laboratory and by a Numerical Method

Abstract

The main purpose of this study is to test the ability of competition fluid dynamic (CFD) model which (FLUENT) program to simulate the flow over broad crested weir with lower cost and lesser time. This purpose is done by operating an experimental model in the laboratory and then validating this model in the GAMBIT program and FLUENT (ANSYS R 15.0), by comparing the results. The FLUENT can solve Navier- Stokes equations of the flow numerically, the volume of fluid method (VOF) and Standard k– ε turbulence equation is depended to simulate water level. Generally, it can be established that the experimental results of flow have a good agreement with the numerical results. The percentage of error (RE %) between numerical and experimental discharge is 2.94%, while the maximum RE % for water level is 6.25%. The numerical results of flow over broad crested weir showed in counter and vector results, and the streamlines of flow was clear than that of the experimental model. Finally, the FLUENT proved that can it be relied upon in future by designing weirs without needing to work experimentally.