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The properties of flow around a circular cylinder impulsively started into translatory and rotatory motion with rotational parameter a less than or equal to 8.0 and Reynolds number Re=100 and 200 are investigated in the present paper. The vorticity and stream function N-S equations are adopted here, with a 2nd-order spatial and temporal accuracy ADI (alternating direction implicit) scheme. Moreover the wall vorticityobtain through the principle of conservation of the total computational domain vorticityis determined by domain vorticity and stream function, therefore, through the wall vorticity iteration, the wall vorticity condition is not fixed during the time step. And the present model results indicate: (1) when α >4.0, vortex street suppression is obvious for the computational period (t <60) for all the Re numbers here studied; (2) the higher the a number for the same Reynolds number, the slower the upper main vortex proceeds; (3) the maximum instantaneous transverse coefficient exceeds the limitation 4π.
The properties of flow around a circular cylinder impulsively started into translatory and rotatory motion with rotational parameter a less than or equal to 8.0 and Reynolds number Re = 100 and 200 are investigated in the present paper. The vorticity and stream function NS equations are adopted here , with a 2nd-order spatial and temporal accuracy ADI (alternating direction implicit) scheme. Moreover the wall vorticityobtain through the principle of conservation of the total computational domain vorticityis determined by domain vorticity and stream function, therefore, through the wall vorticity iteration, the Vortex street suppression is obvious for the computational period (t <60) for all the Re numbers here studied; (2) when α> 4.0, vortex street suppression is obvious for the computational period ) the higher the number for the same Reynolds number, the slower the upper mainortex; (3) the maximum instantaneous transverse coefficient超过 the limitation 4π.