Large-Eddy Simulation of the Flow over a Wall--Mounted Fence

Numerical computations of the flow over a surface-mounted obstacle in a fully developed planar channel flow at a bulk Reynolds number of 5600 are presented. The shedding of vortical structures separating from the leading edge of the obstacle and the behavior of the flow in the re-attachment region are discussed. High turbulent kinetic energy and vortex shedding appear at the same location. The LES results are used to visualize the instantaneous behavior of large-scale vortical structures.