Investigation of velocity distribution in open channel flows based on conditional average of turbulent structures

Authors

Yu Han, University of Wollongong, China Agricultural UniversityFollow
Shu-qing Yang, University of WollongongFollow
Muttucumaru Sivakumar, University of WollongongFollow
Liu-Chao Qiu, China Agricultural University

RIS ID

115348

Publication Details

Han, Y., Yang, S., Sivakumar, M. & Qiu, L. (2017). Investigation of velocity distribution in open channel flows based on conditional average of turbulent structures. Mathematical Problems in Engineering, 2017 1458591-1-1458591-9.

Abstract

We report the development of a new analytical model similar to the Reynolds-averaged Navier-Stokes equations to determine the distribution of streamwise velocity by considering the bursting phenomenon. It is found that, in two-dimensional (2D) flows, the underlying mechanism of the wake law in 2D uniform flow is actually a result of up/down events. A special experiment was conducted to examine the newly derived analytical model, and good agreement is achieved between the experimental data in the inner region and the model's prediction. The obtained experimental data were also used to examine the DML-Law (dip-modified-log-law), MLW-Law (modified-log-wake law), and CML-Law (Cole's wake law), and the agreement is not very satisfactory in the outer region.