Abstract
An attempt has been made to simulate secondary flows in curved open channels using three-dimensional CFD analysis. Besides the classical center-region cell, a counter rotating outer bank cell is often observed which could play an important role in the mechanism of sediment transport. The CFD analysis is carried out on the 120° curved open channel bend using the commercial software package Fluent. The volume of fluid (VOF) model is used to simulate the air-water interaction at the free surface and the turbulence closure was obtained using the Reynolds stress model (RSM). It is observed that the RSM model was able to predict both circulation cells successfully. The results show that the core of maximum velocities is found close to the separation between both circulation cells and below the free surface which agrees well with the experimental data.
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