Characteristics of secondary flow vorticity and longitudinal velocity in a sharp bend
-
Published:2023-08-01
Issue:1
Volume:2565
Page:012021
-
ISSN:1742-6588
-
Container-title:Journal of Physics: Conference Series
-
language:
-
Short-container-title:J. Phys.: Conf. Ser.
Author:
Sun Yi,Yi Xiaoyan,Ma Jing,Tian Yong,Gu Zhigang
Abstract
Abstract
The complex flow structure in sharp bends may cause a series of water and sediment problems which are of great risk to flooding control and engineering safety. For this reason, there is of great significance to study the characteristics of secondary flow in sharp bends. In this article, the characteristics of vorticity and longitudinal velocity in sharp bends are studied by laboratory experiments and theoretical analysis. The results showed that there are two opposite circular currents on every cross-section in the bend. The two circular currents show a trend of increasing and decreasing streamwise. Vorticity is used to indicate the secondary flow intensity and is used to adjust the formula of longitudinal average velocity. The new formula fit the experiment data well and can describe the phenomenon of the maximum longitudinal average velocity appearing near the bed surface.
Subject
Computer Science Applications,History,Education
Reference19 articles.
1. Experimental study on the cumulative effect of continuous sharp bends on sediment transport capacity of the river section;Wu;Yellow River,2023
2. Flow separation at convex banks in open channels;Blanckaert;Journal of Fluid Mechanics,2015
3. Experimental investigation on turbulent flow in a square-sectioned 90-degree bend;Sudo;Experiments in Fluids,2008
4. Study of circulating velocity profile and lateral sediment transport in curved channels;Sun;Advances in Water Science,2006
5. Large eddy simulation of lock-exchange flow in a curved channel;Mandinia;Journal Of Hydraulic Engineering, ASCE,2012