Loss Coefficient of Expansion in Diverging Channel

Abstract

In this present work, a hydraulic study was done on the expansion section of the Kaskaskia river, Illinois (USA) (Nani G. Bhowmik). The set of flow variables was collected from the Kaskaskia river, on Reach-1. Investigation on loss coefficient was done on the two expansion sections of Kaskaskia river (1-2 and 13-15) with the diverging angle of 0.50° and 0.17°, respectively. This study was done to understand the effects of the flood on non-prismatic diverging channels. The ANSYS-FLUENT software was used for four different turbulence models, like k-є, k-ω, LES (large eddy simulation) and RANS (Reynolds-averaged Navier–Stokes equation) on the expansion section of Kaskaskia river. Among all the models, LES gave the best result. The predicted velocity was found nearly equal to the observed velocity.