Author(s): K. Ikenaga; A. ; Nakayama
Linked Author(s): Akihiko Nakayama
Keywords: No Keywords
Abstract: A conventional RANS method based on a low-Reynolds number k-w two equation model is extended to simulate large flow changes with an unsteady hydraulic jump and compared with a LES simulation. The flow over a drop with a trench is known to depend sensitively on the shape of the trench section and for certain values of the aspect ratio, the position of the hydraulic jump moves up and down at a certain frequency. By resolving the flow near the reattaching region adequately, the unsteady oscillation of reattaching flow and hydraulic jump could be reproduced by the present RANS method, LES calculation separately conducted shows similar overall flow behavior but the predicted turbulence intensities and kinetic energy are better predicted by the present Unsteady RANS calculation.
Year: 2009