圆柱体垂直异步入水空泡及运动干扰特性研究OA

The cavity evolution,impact loads,and complex flow field structures induced by the water entry of bodies constitute a classic problem in the field of hydrodynamics.With the continuous development of trans-media vehicles,the water entry of multiple bodies has emerged as a research hotspot.This paper focuses on the asynchronous vertical water entry of cylinders and employs numerical simulation methods to investigate the effects of entry parameters on cavity morphology,flow field structures,and the motion characteristics of the cylinders.First,a numerical simulation method for high-speed asynchronous water entry was established based on the Improved Delayed Detached Eddy Simulation(IDDES)turbulence model,and its validity was verified against experimental data.Second,numerical simulations were conducted to explore the mechanisms of cavity evolution and motion interference during the asynchronous vertical water entry process,with a focus on analyzing the influence of the time interval on these characteristics.The results indicate that,regarding cavity evolution,a typical"double vortex tube"structure exists during the process,revealing the three-dimensional asymmetric evolution mechanism of dual cavities in asynchronous vertical water entry.In terms of motion characteristics,the time interval plays a significant role in controlling the deflection behavior and stability of both the leading and trailing cylinders.As the time interval increases,the motion stability of the cylinders improves significantly.Furthermore,the trailing cylinder exhibits a distinct drag reduction effect induced by the wake of the leading cavity.