Volume 39, Number 1, February 2021
|Page(s)||101 - 110|
|Published online||09 April 2021|
Research on hydrodynamic characteristics of cylinder planing
School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
2 Xi'an Qing'an Electric Control Co., LTD, Xi'an 710077, China
3 The 705 Research Institute, China State Shipbuilding Corporation Limited, Xi'an 710077, China
This paper selects SST k-w turbulence model and VOF wave to construct a numerical calculation model of moving body planning on a flat free surface based on STAR-CCM+ numerical simulation software. The construction model is checked through foreign classic literature, and the numerical simulation results are in good agreement with the experimental results. The hydrodynamic numerical errors are less than 5%, which is within the engineering error range. The model can be used for the numerical simulation of the planning cylinder. In this paper, it is used to simulate the planing process of cylinder with different speeds and different submerged depths, and the flow field characteristics and hydrodynamic characteristics in the planing process are obtained. The results show that waves appear at the tail and the tail liquid splashes to form a water splash during the planing process of the cylinder on a flat surface. The higher the speed of the planning cylinder is, and the deeper the submersion depth, the more pronounced waves at the tail. When the cylinder has a Fr number Cv≥8, the hydrodynamic force of the cylinder is almost unchanged, and it is not affected by the speed. But when Cv=3, the hydrodynamic characteristic coefficient is higher. The drag coefficient is 20% higher than that in the high-speed (Cv≥8) planing process. The lift coefficient is 3 times of high-speed planing lift coefficient. It is related to the surface pressure and frictional force distribution of cylinder during the low-speed planing. There is a linear relationship between the drag coefficient and the submerged depth during the cylinder planing at different submerged depths.
Key words: moving cylinder / planing / flow field characteristics / hydrodynamic characteristics / numerical simulation
关键字 : 回转体 / 滑水 / 流场特性 / 流体动力特性 / 数值仿真
© 2021 Journal of Northwestern Polytechnical University. All rights reserved.
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