Numerical Simulation on Cavity Evolution and Flow Field Characteristics of Cylinder Obliquely Entering Water under Ice Hole Constraint

doi:10.12382/bgxb.2023.0969

Abstract

Abstract:

In order to study the influence of ice hole constraint on the inclined water entry process of a cylinder, a numerical method for a cylinder entering water entry under ice hole constraint is established based on a volume-of-fluid multiphase flow model. The accuracy of the numerical method is verified by experimental tests. On this basis, the process of the cylinder entering water under the condition of different ice hole diameters is simulation, and the cavitaty evolution and motion characteristics of the cylinder entering water under the constraint of ice hole are analyzed. The results show that the ice hole constraint changes the flow of free liquid surface, thus affecting the direction and shape of surface splash. In addition, because the liquid hits the wall of ice hole, it consumes part of the energy of cavity for expansion, which leads to the obstruction of cavity expansion. A reflected flow is formed after impact, and the reflected flow is opposite to the expansion direction of cavity, which further hinders the cavity expansion and causes the cavity wall of the water-away side to be curved. The cavity wall is in direct contact with the ice hole under the condition of small ice hole diameter, which makes the cavity deform locally and hinders its expansion. Under the condition of larger ice hole diameter, the cavity wall does not contact with the ice hole, and the reflected flow becomes the main reason for inhibiting the cavity shape. In addition, under the constraint of ice holes, a wider shear deformation area appears on the free liquid surface, and there are more large-scale vortices in the cavity. The vortices lead to the increase of pressure gradient in the cavity to make the cavity subject to pressure in different directions, thus inhibiting the cavity shape at the free liquid surface. Ice hole constraint causes the increase in the peak value of water-entry load of cylinder, and the faster velocity decay of cylinder.

Key words: ice hole constraint, oblique water-entry, cavity evolution, vortex distribution, motion characteristics

CLC Number:

O383
TJ012.3

YANG Zhe, LU Lin, LI Qiang, SUN Zhiqun, HOU Yu. Numerical Simulation on Cavity Evolution and Flow Field Characteristics of Cylinder Obliquely Entering Water under Ice Hole Constraint[J]. Acta Armamentarii, 2024, 45(12): 4539-4553.

Figures/Tables 27

Fig.1 Schematic diagram of experimental apparatus

Fig.2 Experimental installation site layout

Fig.3 Experimental cylinder model

Fig.4 Comparison of experimental (left) and numerical (right) cavity shapes in the process of cylinder oblique water-entry

Fig.5 Comparison between simulated and experimental results of cylinder velocity reduction

Fig.6 Calculation model

Fig.7 Validation of the numerical model

Fig.8 Calculation model settings

Fig.9 Setting of water entry conditions

Fig.10 Global grid division

Fig.11 The minimum value of y+ on the projectile surface

Fig.12 Number of Courant in the water entry process

Fig.13 Velocity attenuation curves under different grid densities

Fig.14 Three-dimensional cavitation morphology evolution

Fig.15 Schematic diagram of water entry process

Fig.16 Schematic diagram of velocity vector after collision

Fig.17 Air flow distribution

Fig.18 Density nephogram

Fig.19 The measurement method and measured results of cavity

Fig.20 Vector diagram of local flow field

Fig.21 Air phase distribution

Fig.22 Vapor phase distribution

Fig.23 Vortex distribution on x=0mm plane in ice-free and Φ=4 environment

Fig.24 Velocity vector field

Fig.25 Pressure distribution in cavity

Fig.26 Dynamic characteristics of flow field

Fig.27 Deflection angle

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