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力学学报  2004 

FLOWS PAST A ROTATING CIRCULAR CYLINDER BY FVM BASED ON UNSTRUCTURED MESHES
用非结构网格研究旋转振荡圆柱绕流

Keywords: a rotary oscillating cylinder,Navier-Stokes equations,unstructured meshes,vortex shedding,force coefficients
旋转振荡圆柱
,Navier-Stokes方程,非结构网格,涡脱落,作用力系数

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Abstract:

The unsteady flow past a circular cylinder which starts translating and rotary oscillating impulsively from rest in a viscous fluid is investigated at Reynolds numbers $Re=200$ and 1000, rectilinear speed ratios $\alpha =0.5$, 2.0 and 4.0, and for forced oscillating frequencies $f_{s}$ between 0.1 and 2.0. Numerical solutions of the Navier-Stokes equations are obtained by a finite volume method based on unstructured colocated meshes. The discretized schemes of the convective fluxes, diffusive fluxes and unsteady term are all of second-order accuracy. The SIMPLE algorithm is adopted to deal with the pressure-velocity coupling. The varieties of force coefficients with the control parameter are obtained after the discussion. The amplitudes of lift coefficients at natural shedding frequency and forced oscillating frequency respectively are determined by the amplitude spectra analysis, which show clearly the competitive relationship between the two frequencies. Based on this relationship, the region of the classification of flow structure modes is given at last.

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