ABSTRACT
The secondary current of the second kind, which is initiated by the turbulence anisotropy, is a classical topic in fluid engineering and has been studied by many researchers with wide variety of methods. However, we have still controversy on this phenomenon, in particular, the secondary currents in open channels with larger aspect ratio (=B/h>5,B: channel width, h: water depth). This paper investigated the fundamental characteristics of the secondary current of the second kind in wide shallow open channel flows through the comparison between 3-D (three-dimensional) URANS (Unsteady Reynolds Averaged Navier Stokes Equations) computations and results of laboratory experiments performed by Blanckaert et al. (2010). A second order non-linear k-\varepsilon model proposed by Ali et al. (2007) was employed as a turbulence model.
