Wind and Structures

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Large eddy simulations of the flow around a circular cylinder: effects of grid resolution and subgrid scale modeling

  • Salvatici, E. (Dipartimento di Ingegneria Aerospaziale, Universita di Pisa) ;
  • Salvetti, M.V. (Dipartimento di Ingegneria Aerospaziale, Universita di Pisa)
  • Received : 2002.11.30
  • Accepted : 2003.08.06
  • Published : 2003.12.25
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Abstract

Large-eddy simulations of the flow around a circular cylinder at a Reynolds number, based on cylinder diameter and free-stream velocity, $Re_D=2{\times}10^4$ are presented. Three different dynamic subgrid-scale models are used, viz. the dynamic eddy-viscosity model and two different mixed two-parameter models. The sensitivity to grid refinement in the spanwise and radial directions is systematically investigated. For the highest resolution considered, the effects of subgrid-scale modeling are also discussed in detail. In particular, it is shown that SGS modeling has a significant influence on the low-frequency modulations of the aerodynamics loads, which are related to significant changes in the near wake structure.

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References

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