Numerical study on flow characteristics around wavy conical cylinders in triangular arrangement
The large eddy simulation method was employed to numerically investigate the effects of the trans-verse spacing ratios and the streamwise spacing ratios on the lift and drag characteristics,wake interference and three-dimensional flow structures of the triangular arrangement of wavy conical cylinders with the subcritical Reynolds number of 3 900.The results show that the downstream wavy conical cylinder has little influence on the lift and drag characteristics of the two upstream wavy conical cylinders.The downstream wavy conical cyl-inder is located in the wake of the two upstream wavy conical cylinders,and its lift and drag characteristics are significantly affected by the transverse and streamwise spacing ratios.The flow regimes between the three wav-y conical cylinders can be divided into neighboring interference,vortex impingement and vortex interaction.In the vortex impingement regime,the wake vortex of the upstream wavy conical cylinders is fully developed and periodically impinges on the surface of the downstream wavy conical cylinder,resulting in a large fluctuating lift.With the transverse spacing ratio of 3 and the streamwise spacing ratio of 6,the lift fluctuation of the downstream wavy conical cylinder is enhanced by 20.93 times compared with that of the single cylinder.
万方数据
维普
