Experimental investigation of ventilation bubble dynamics around a vertically moving cylinder under reduced ambient pressure

Chen, Xiangbin; Xiao, Wenbin; Gong, Ruiyan; Yao, Xiongliang; Hu, Shaofeng

doi:10.1088/1873-7005/ac522c

Cited by 9 publications

(1 citation statement)

References 20 publications

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“…Their results showed that this model could more accurately predict the loads on the object than linear models. Furthermore, many researchers [18][19][20][21][22][23] have set up experimental platforms to investigate the phenomenon of cavitation during the process of water exit, the morphology of the ventilated cavity, the deformation of the free surface, the movement of the vehicle, and the characteristics of load and have reported satisfactory results. A considerable amount of research [24][25][26][27][28][29][30] has also been devoted to the ventilated cavity of underwater vehicles.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of an Underwater Ventilated Vehicle Exiting Water in an Environment with Scattered Ice Floes

Zhang,

Lin,

et al. 2023

JMSE

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The presence of ice floes on the water surface has a significant impact on the complex hydrodynamic process of submersible ventilated vehicles exiting the water. In this paper, we propose numerical simulations based on computational fluid dynamics to investigate the process of a ventilated vehicle exiting water in an ice-water mixture. The Schnerr–Sauer model is used to describe the cavitation, while the turbulence is solved by using the k-ω shear stress transport (SST) model. We also introduce the contact coupling method to simulate the rigid collision between the vehicle and the ice floe. We calculated and analyzed the process of the vehicle exiting the water under three conditions: ice-free conditions and in the presence of regularly shaped and irregularly shaped ice floes. The findings indicate that the ice floes contributed to the rapid fragmentation of the water plume to induce the premature collapse of the ventilated cavity and alter its form of collapse. The presence of ice floes intensified the evolution of the flow field close to the vehicle, and their flipping led to a significant volume of splashing water that could have led to the localized secondary closure of the cavity. Moreover, the collision between the vehicle and the ice floes caused pressure pulsations on the surface of the former, with a more pronounced effect observed on the head compared with the cylindrical section. While crossing the ice-water mixture, the vehicle was exposed to water jets formed by the flipping ice floes, which might have led to localized high pressure.

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