Computational Analysis of Sphere Wakes in a Linearly Stratified Fluid

Cao, Liushuai; Huang, Fenglai; Wan, Decheng; Gao, Yangyang

doi:10.17736/ijope.2021.ak42

Cited by 3 publications

(1 citation statement)

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“…Ma et al [95,96] have employed a hybrid grid and DES model to study underwater vehicles in linearly stratified fluids, examining the influence of parameters like speed, depth, density gradient, and motion attitude on turbulent wakes at the free surface. Cao et al [97][98][99] and Huang et al [100] have proposed a thermocline model based on Boussinesq approximation, simulating vortical structures and wakes of sphere and a generic submarine model in homogeneous and stratified environments. Anisotropy of the surface wave crest and trough, along with a larger influencing zone of Kelvin waves, was evident in the stratified case (Figure 3).…”

Section: Computational Fluid Dynamicsmentioning

confidence: 99%

Review on the Hydro- and Thermo-Dynamic Wakes of Underwater Vehicles in Linearly Stratified Fluid

Cao,

Pan,

Gao

et al. 2024

JMSE

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Wakes produced by underwater vehicles, particularly submarines, in density-stratified fluids play a pivotal role across military, academic, and engineering domains. In comparison to homogeneous fluid environments, wakes in stratified flows exhibit distinctive phenomena, including upstream blocking, pancake eddies, internal waves, and variations in hydrodynamic performance. These phenomena are crucial for optimizing the operation of underwater vehicles. This review critically assesses the hydrodynamic and thermodynamic aspects of these wakes through an integration of theoretical, experimental, and numerical approaches. The hydrodynamic wake evolution, comprising near-wake, non-equilibrium, and quasi-two-dimensional regimes, is scrutinized. The underlying physics, encompassing energy transformation, vertical motion suppression, and momentum dissipation, are analyzed in detail. Special emphasis is placed on numerical methods, encompassing diverse approaches and turbulence models and highlighting their differences in fidelity and computational cost. Numerical simulations not only provide insights into the intricate interplay among various factors but also emerge as a crucial focal point for future research directions. In the realm of thermodynamic wakes, we delve into the thermal wake induced by the discharge of high-temperature cooling water and the cold wake resulting from the stirring of seawater. The generation, evolution, and ascent to the free surface of these wakes are explored. Additionally, this review identifies and analyzes current research shortcomings in each aspect. By systematically addressing existing knowledge gaps, our study contributes novel insights that propel academic progress and bear significant implications for submarine engineering. This work not only enhances our understanding of the intricate dynamics involved but also provides a foundation for future research endeavors in this critical field.

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Section: Computational Fluid Dynamicsmentioning

confidence: 99%

Review on the Hydro- and Thermo-Dynamic Wakes of Underwater Vehicles in Linearly Stratified Fluid

Cao,

Pan,

Gao

et al. 2024

JMSE

Self Cite

View full text Add to dashboard Cite

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Numerical study of submerged body tail linearization in a strongly stratified fluid on the characteristics of generated internal waves

Zou,

Zhao,

et al. 2023

Ocean Engineering

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Numerical Simulation of the Maneuvering Motion Wake of an Underwater Vehicle in Stratified Fluid

Shi

Cheng

Liu

et al. 2022

JMSE

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When a vehicle moves underwater, disturbance is generated and a wake remains that destroys the original free surface and produces a new wake. In order to study the mechanism and characteristics of the wave-making wake generated by the maneuvering motion of an underwater vehicle in density-stratified fluid, the k-ε model and the VOF method that is based on the RANS equation were used in this paper to analyze the SUBOFF model in stratified fluid at different drift angles. Numerical simulation of the maneuvering motion was carried out under these angles, and the corresponding changes in flow field caused by this motion were analyzed. The results from the comparison and analysis of the surface wave wakes under different drift angles in stratified fluid show that with the increasing drift angle, the motion wake of the vehicle still exhibits obvious Kelvin wave system characteristics. However, there are significant changes in hydrodynamic performance. The asymmetry of the surrounding flow field will increase with the increase in the drift angle. The pressure of the underwater vehicle is inversely proportional to the velocity of the surrounding flow field, and the amplitude of the peak and trough of the free surface wave is linearly related to the change in the drift angle. The numerical simulation can serve as a reference for the non-acoustic detection of the motion heading of an underwater vehicle and the motion trajectory of anti-reconnaissance underwater vehicles under actual sea conditions.

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Computational Analysis of Sphere Wakes in a Linearly Stratified Fluid

Cited by 3 publications

References 0 publications

Review on the Hydro- and Thermo-Dynamic Wakes of Underwater Vehicles in Linearly Stratified Fluid

Review on the Hydro- and Thermo-Dynamic Wakes of Underwater Vehicles in Linearly Stratified Fluid

Numerical study of submerged body tail linearization in a strongly stratified fluid on the characteristics of generated internal waves

Numerical Simulation of the Maneuvering Motion Wake of an Underwater Vehicle in Stratified Fluid

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