中文摘要：

Viscous flow around a circular cylinder at a subcritical Reynoldsnumber is investigated using a large eddy simulation (LES) coupled with theSmagorinsky subgrid-scale (SGS) model. A fractional-step method with a second-order in time and a combined finite-difference/spectral approximations are used tosolve the filtered three-dimensional incompressible Navier-Stokes equations. Calcula-tions have been performed with and without the SGS model. Turbulence statisticalbehaviors and flow structures in the near wake of the cylinder are studied. Somecalculated results, including the lift and drag coefficients, shedding frequency, peakReynolds stresses, and time-average velocity profile, are in good agreement with theexperimental and computational data, which shows that the Smagorinsky model canreasonably predict the global features of the flow and some turbulent statistical be-haviors.

英文摘要：

Viscous flow around a circular cylinder at a subcritical Reynolds number is investigated using a large eddy simulation (LES) coupled with the Smagorinsky subgrid-scale (SGS) model. A fractional-step method with a second-order in time and a combined finite-difference/spectral approximations are used to solve the filtered three-dimensional incompressible Navier-Stokes equations. Calculations have been performed with and without the SGS model. Turbulence statistical behaviors and flow structures in the near wake of the cylinder are studied. Some calculated results, including the lift and drag coefficients, shedding frequency, peak Reynolds stresses, and time-average velocity profile, are in good agreement with the experimental and computational data, which shows that the Smagorinsky model can reasonably predict the global features of the flow and some turbulent statistical behaviors.