Author(s): Ken Vui Chua, Richard Mcsherry, Thorsten Stoesser
Linked Author(s): Ken Chua
Keywords: Large eddy simulation, free surface, turbulent flow, level-set method
Abstract: This paper describes the use of large eddy simulation to study turbulent low submergence flow over a single bottom mounted cube. Two simulations have been carried out. The first case is a plane channel simulation that replicates a laboratory experiment for validation purposes while the second case concerns open channel flow past a bottom mounted cube, with free surface deformation captured using the level set method. Streamlines, mean streamwise velocity, shear stress and turbulent kinetic energy profiles at the symmetry plane of the cube are presented in the validation section and reasonably good agreement against the experiment is achieved. The free surface open channel simulation reveals significant deformation of the water surface downstream of the cube, including a large dip followed by a standing wave that is characterised by a pronounced bow shape. Q-criterion iso-surfaces are plotted to highlight the turbulent structures shed by the cube and the extent to which large energy-carrying vortices interact with the free-surface
Year: 2017