Numerical investigation of beam effect as roughness on S-type hydraulic jump characteristics in sudden expansion

Articles in Press

Document Type : Research Paper

Authors

Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran. Center of Excellence of the Network Improvement and Maintenance, Ahvaz, Iran

Abstract

In this study hydraulic jump (HJ) in a rectangular channel with a sudden divergence and the use of an intersecting beam system as roughness to stabilize the asymmetric hydraulic jump was simulated using Flow3D . The characteristics of the hydraulic jump were investigated using three different configurations of the intersecting beam system. The number and thickness of the beams at different percentages of the reference tailwater depth (hs) were examined . The results showed that use of the intersecting beam system leads to stability and elimination of asymmetric waves and return flow in the asymmetric S-type jump and significantly reduces the jump length. The maximum reduction in the length of the asymmetric S-type HJ was observed for configuration 3 and 0.9hs at 78.02%. To evaluate the optimal configuration for a Fr of 9.5, which was measured using a 3D EMV velocity meter, it was found that the use of intersecting beams in all cases of tailwater depth and configurations reduces the jump length. The trend of changes in the dimensionless length of the basin as an indicator of length reduction as well as the roller length from 0.7hs to hs was decreasing in such a way that on average, the dimensionless roller length in 0.7hs tailwater conditions with a value of 19.65 has the highest and hs of 11.63 has the lowest value and compared to the reference test value for a Fr of 9.5 showed a decrease of 54.77 and 73.23 percent, respectively.

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Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 08 March 2025

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