Comparison of 2D and 3D Modeling of Converging and Diverging Flood Plains

Abstract

The objective of this study to predict the depth-averaged velocity in a compound channel having diverging and converging floodplains with varying transverse velocity from main channel to flooded plain. The problem come across to select the best applicable model for natural flooded river system. This happens when impacts are considered in both the flood estimation of the stream as well as in pressure driven hydraulic modelling. It can be especially imperative with regards to the expanding to consolidate hydrological and water driven models in a way that gives a point by point and spatially reasonable representation of flood risk with depth averaged velocity. For modelling of depth averaged velocity experimental data observed from Diverging channel with relative depth 0.25. The same experimental setup is modelled in ANSYS (Fluent) using LES model and CES (conveyance estimation software) to find depth-averaged velocity and it is compared with the data obtained from other researchers. The depth averaged velocity from both experimental work and numerical experimentation through ANSYS-Fluent package and CES is compared to evaluate the efficiency of the approached model