Numerical simulation of wedge impacting on wavy water

JIN Yutong; CHEN Jichang; LU Yujin; XIAO Tianhang; TONG Mingbo

doi:10.7527/S1000-6893.2019.22854

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2019 , Vol. 40 >Issue 10: 122854 - 122854

DOI: https://doi.org/10.7527/S1000-6893.2019.22854

Fluid Mechanics and Flight Mechanics

Numerical simulation of wedge impacting on wavy water

JIN Yutong ,
CHEN Jichang ,
LU Yujin ,
XIAO Tianhang ,
TONG Mingbo

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National Defense Key Laboratory of Aircraft Advanced Design Technology, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received date: 2018-12-13

Revised date: 2019-02-21

Online published: 2019-05-15

Supported by

The Fundamental Research Funds for the Nanjing University of Aeronautics and Astronautics(kfjj20180104); National Defense Pre-research Foundation; A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions

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Abstract

The characteristics of force and change histories of motion during wedge impacting on wavy water are examined and simulated numerically in order to provide technical and theoretical support for seaplane ditching on wave. Solutions are generated with the finite-volume method based on Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations and the SST k-ω turbulence model. A velocity-inlet boundary wave maker and a momentum absorbing zone combination with Volume of Fluid (VOF) model are employed to generate waves. The global moving mesh method and the methods above coupled with three/six degree of freedom model adapts to simulate the free falling wedge on linear regular and irregular waves. The characteristics of force and the changes of motion during two-dimensional (2D) wedge entering on wave at crest, trough, balance positions (up-speed and down-speed) are studied particularly based on the validation of numerical examples. The results show that the numerical wave simulation results show good agreement with analytical wave with a deviation of 1%. In the case of 2D wedge impacting on regular wave, the vertical velocity and force have the same trend at different positions of regular wave. There is a little effect on displacement in the x-direction and its value changes less than 0.01. The roll angle and lateral velocity of the wedge change significantly at the balance positions of the linear regular wave, the values are eight and ten times at the crest and trough respectively. This is due to the faster change of velocity and hydrodynamic at balance positions of wave than crest and trough. Another interesting reason is the different relative force of the oblique sides of wedge and wave, which participated in the process of wedge impacting on wave and effected its change. Furthermore, several numerical cases of 2D wedge impacting on irregular wave at five random time points and three-dimensional(3D) wedge entering on regular wave at crest and balance position(up-speed) are presented and investigated, the changes and causes of them are similar to 2D wedge impacting on regular wave at different positions.

Key words： wedge; finite volume method; global dynamic mesh; velocity-inlet boundary wave maker; wavy water

Cite this article

JIN Yutong , CHEN Jichang , LU Yujin , XIAO Tianhang , TONG Mingbo . Numerical simulation of wedge impacting on wavy water[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019 , 40(10) : 122854 -122854 . DOI: 10.7527/S1000-6893.2019.22854

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