Simulation of hydraulic jump on bed with gravel roughness using FLOW- 3D software

Abstract

Hydraulic jump control in open channels to reduce energy and damage to downstream constructions has always been a topic of researchers' interests. One of the most important cases in this field is the build of various types of stilling basin considering economic factors and ease of construction. For this reason, jump simulations are often performed before deciding to construct a stilling basin to predict jump behavior in different conditions. One of the new methods of jump control in channels is the construction of a stilling basin with gravel roughness. Therefore, in this research, jump simulation on a non-sloped bed with gravel roughness in the initial Froude numbers of 4.9 to 7.8 and four different roughness's diameters of zero, 1, 4 and 10 mm was performed using FLOW-3D software and results were compared with experimental results. Results showed that the maximum and minimum errors in estimating the initial depth were determined on the bed without roughness and with diameter roughness of 4 mm and the highest and lowest errors in estimating the sequent depth were determined on the bed with diameter roughness of 4 mm and the bed without roughness, respectively. Moreover, the highest and lowest errors in estimating the jump length occurred in the bed with a diameter roughness of 4 mm and the bed without roughness, respectively.