Large-Eddy Simulation Of Neutral Turbulent Flow Over Rough Sinusoidal Ridges

摘要: The requirements for a credible large-eddy simulation of neutral, turbulent flow over hills with an aerodynamically rough surface are discussed, in order to select suitable case simulation. As well as providing adequate resolution within the dynamically important inner region, obtaining realistic upstream or undisturbed mean velocity profile is also critical importance. A distributed drag canopy formulation has been introduced model allow it obtain such while resolving very close surface. Simulations have then performed ridges varying heights. results from steepest case, which just on verge separation, compared wind-tunnel observations. It shown that much better agreement experimental data than simple first-order mixing-length closure model. An encouraging lack sensitivity numerical demonstrated.