2D computational modelling of secondary flow in bended channels

This work presents a 2D hydrodynamic model for bended open-channel flow. Despite the three-dimensionality of the helical flow in channel bends, the use of 3D models is still very challenging, especially to simulate a large-scale problem as a natural river. Therefore, 2D models are commonly used to simulate flow in rivers. However, most of the numerical models do not reproduce accurately the secondary flows that are formed in bended channels. For this reason, we modified an existing numerical model to consider the effects of the secondary flow on the water surface. In this work we present three different approaches to include the secondary flow effects in the model.