STATISTICAL ANALYSIS OF TEMPORAL VECTOR ANGLE VARIATIONS AND ITS CHARACTERISTICS IN TURBULENT FLOW
Authors:James Ball Organization:IAHR
Entrainment of sediment particles is stochastic in nature due to the instantaneous fluctuation of velocity fluctuations and turbulent shear stress.The temporal variations of turbulent flow are a very important characteristic for sediment entrainment particularly at low shear stress.To characterise the temporal variation,the velocity vector angles in two dimensions are investigated in this experimental study.Data for this study was obtained from three dimensional flow velocities measured in an experimental flume using an Acoustic Doppler Velocimeter(Micro-ADV).This data was analysed to calculate the instantaneous vector angles of the turbulent velocities.The changes in vector angles((35)θ)at sequential time steps were calculated also.A statistical analysis of the values of(35)θobtained from the different experimental tests was undertaken.The resultant statistical characteristics were found to be a good representation of the characteristics of movement between quadrants of the turbulence.Also the results indicated that standard deviation of vector angles changed with flow depth from the bed to the free surface.
Title: STATISTICAL ANALYSIS OF TEMPORAL VECTOR ANGLE VARIATIONS AND ITS CHARACTERISTICS IN TURBULENT FLOW
Event: 18th IAHR APD Congress2014年10月01-01日
James Ball

School of Civil and Environmental Engineering, UTS

IAHR

James Ball is a member of the School of Civil and Environmental Engineering at UTS. His research interest include development and application of catchment models. He is currently a Vice-President of IAHR and participates in the IAHR Committees on Hydroinformatics and Urban Drainage (Joint Committee with IWA). He is also a Fellow of Engineers Australia and has been a co-opted member of their National Committee on Water Engineering for numerous years. Additionally, he was the Editor responsible for the current revision to the Australian Guidelines for flood estimation - Australian Rainfall and Runoff - that was published in 2016. Also, he is the Editor-in-Chief for the International Journal of River Basin Management, an Editor for Water Science and Technology, and a member of the editorial boards for the Urban Water Journal, the Journal of Hydroinformatics, and the Australian Journal of Water Resources. ... More
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