In this paper

the lifting and drag characteristics

flow field structure and wake interference effects of two staggered wavy conical cylinders with center-to-center pitch ratios of L/Dm=4 and 5 and staggered angles of α=0~15° at Reynolds number 3900 are studied by large eddy simulation. The results show that the trailing vortex of the upstream wavy conical cylinder curls up and impacts on the side of the downstream wavy conical cylinder

which causes periodic coupling force on the surface of the downstream wavy conical cylinder

resulting in the increase of the fluctuating lift coefficient. At α=10° the fluctuating lift coefficient is 20.1 times and 21.4 times higher than that of single straight cylinder

respectively. Under the influence of two free ends of the upstream wavy conical cylinder and the backflow area generated by the interaction between the upstream wavy conical cylinder and the downstream wavy conical cylinder

the time-average drag coefficient of the downstream wavy conical cylinder is significantly reduced

and with the increase of the staggered angle

the time-average drag coefficient of the downstream wavy conical cylinder gradually approaches that of the upstream wavy conical cylinder. At α=10°

the time-average drag coefficient is 34.9% and 18.8% lower than that of a single cylinder

respectively. The flow around the staggered double wavy conical cylinders shows the flow structures of complete impact

side impact and wake disturbance et al. Because of the shape of the wavy conical cylinder

the flow field passing through the wavy conical cylinder presents strong three-dimensional characteristics

and the trailing vortex has obvious stratification

and the side impact condition provides a larger fluctuating lift coefficient than the other two. The results in this paper can provide theory support for the array layout of wind floating structure.