Large-Eddy Simulation of Flow Around a Rectangular 5:1 Cylinder with Different Inflow Turbulence Conditions

The aerodynamics characteristics around the bluff body is a simple but fundamental problem of fluid physics. With the increase of computational power, more and more bluff aerodynamic results based on the Computational Fluid Dynamics (CFD) method have been reported. However, so far, most of the CFD simulations paid attention to the bluff aerodynamics under laminar inflow, and the results under the turbulent inflow are relatively few. In this study, the numerical simulations of the aerodynamics characteristics around a rectangular 5:1 cylinder impacted by different turbulence fields were carried out by using the Large-Eddy Simulation (LES) method. Total of nine cases with different turbulence intensities and different ratios of integral scales to depth were calculated, and the comparison of results between each case showed good agreement with that of the experiments and theories.The flow structures around the rectangular cylinder were also illustrated to better understand the turbulence effects on bluff bodies.