Navier–Stokes solver for water entry bodies with moving Chimera grid method in 6DOF motions

Nguyen, Van-Tu; Vu, Duc-Thanh; Park, Warn-Gyu; Jung, Chul-Min

doi:10.1016/j.compfluid.2016.09.005

Cited by 80 publications

(16 citation statements)

References 29 publications

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“…They concluded that the hysteresis and nonlinearity in the system are mutually related and pose a significant influence on the motion of the vehicle. Nguyen et al [11] also used a moving Chimera grid method to predict the real-time motion of water entry bodies by combining the 6-DOF rigid body motion model and the numerical calculation of the multiphase flow field, by which the coupled effect of supercavity and moving body can be obtained. S. Kim and N. Kim [12] performed integrated dynamics modeling of supercavitating vehicles and established the 6-DOF equations by defining the hydrodynamic forces and moments.…”

Section: Introductionmentioning

confidence: 99%

Spatial Kinetics Model of Supercavitating Vehicles Reflecting Conic‐Like Oscillation

Huang

Luo

Dang

et al. 2017

Mathematical Problems in Engineering

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A spatial kinetics model for supercavitating vehicles including the coupled motion of pitch, yaw, and rolling was presented. Mathematical simulations were performed to investigate dynamic performance of supercavitating vehicles. An intrinsic conic-like oscillation in the motion of supercavitating vehicles was discovered. A lakebed experiment was carried out to validate the oscillation. Good agreement is achieved between simulation and experiment in terms of the amplitude and frequency of attitude angles. The steady phase difference between the motions in different planes is also accurately captured which is about π/2. The conic-like oscillation is attributed to the occurrence of the tail-slap motion in the vertical and horizontal planes and the steady phase difference.

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Section: Introductionmentioning

confidence: 99%

Spatial Kinetics Model of Supercavitating Vehicles Reflecting Conic‐Like Oscillation

Huang

Luo

Dang

et al. 2017

Mathematical Problems in Engineering

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“…The liquid medium will vaporize and produce cavitation once the pressure at the minimum pressure point drops to the saturated vapor pressure of the liquid [1]. Large density ratio and high gradient flow field parameters arise at the fluid interfaces of cavitation flow, which brings remarkable difficulty in solving the numerical problem [2]. With a lot of complex flow phenomena, such as turbulence, phase transition, and compressibility, the process of water entry has the characteristics of unsteady, strong instantaneous and high load, which will have a significant impact on the motion and structure of the vehicle [3].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Cavitation Flow of High Speed Oblique Water Entry of Revolution Body

Wang

et al. 2019

Mathematical Problems in Engineering

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To explore the effects of water entry angle on the cavitation flow field of high-speed revolution body, based on the finite volume method, VOF (Volume of Fluid) multiphase model, Schnerr-Sauer cavity model, SSTturbulence model, and dynamic mesh method, numerical simulation for modeling the oblique water entry of revolution body at high speed is performed. The evolution laws of cavity shape, motion characteristics, and hydrodynamic characteristics of revolution body at different water entry angles are analyzed. The results show that the numerical calculation method can effectively simulate the change of cavity shape during the water entry of the revolution body. With the increase of water entry angle, the uplift of liquid level decreases in the positive direction of the open cavity and increases in the negative direction. The angle of water entry has little effect on the velocity of the revolution body. The larger the angle of water entry, the greater the peak pressure and the faster the pressure decay at the moment of water entry.

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“…Nguyen et al Nguyen (2014) developed an implicit algorithm based on a dual-time pseudo-compressibility method to compute water impact forces on bodies. And in Nguyen et al (2016), a 6 DOF rigid body motion model and a moving Chimera grid scheme were developed for multiphase flow around moving bodies with application to the water entry problem.…”

Section: Introductionmentioning

confidence: 99%

Research on the water-entry attitude of a submersible aircraft

Feng

et al. 2016

SpringerPlus

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BackgroundThe water entry of a submersible aircraft, which is transient, highly coupled, and nonlinear, is complicated. After analyzing the mechanics of this process, the change rate of every variable is considered. A dynamic model is build and employed to study vehicle attitude and overturn phenomenon during water entry. Experiments are carried out and a method to organize experiment data is proposed. The accuracy of the method is confirmed by comparing the results of simulation of dynamic model and experiment under the same condition.ResultsBased on the analysis of the experiment and simulation, the initial attack angle and angular velocity largely influence the water entry of vehicle. Simulations of water entry with different initial and angular velocities are completed, followed by an analysis, and the motion law of vehicle is obtained. To solve the problem of vehicle stability and control during water entry, an approach is proposed by which the vehicle sails with a zero attack angle after entering water by controlling the initial angular velocity. With the dynamic model and optimization research algorithm, calculation is performed, and the optimal initial angular velocity of water-entry is obtained.ConclusionsThe outcome of simulations confirms that the effectiveness of the propose approach by which the initial water-entry angular velocity is controlled.

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Navier–Stokes solver for water entry bodies with moving Chimera grid method in 6DOF motions

Cited by 80 publications

References 29 publications

Spatial Kinetics Model of Supercavitating Vehicles Reflecting Conic‐Like Oscillation

Spatial Kinetics Model of Supercavitating Vehicles Reflecting Conic‐Like Oscillation

Numerical Simulation on the Cavitation Flow of High Speed Oblique Water Entry of Revolution Body

Research on the water-entry attitude of a submersible aircraft

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