Simulation Study on Thermal Wake Characteristics of Underwater Vehicle under Rotary Motion

Li, Geyang; Du, Yongcheng; Li, Yang

doi:10.3390/app13031531

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…In recent years, as CFD has matured, researchers have gained the capability to thoroughly investigate the entire process of thermal wakes induced by the discharge of cooling water from realistic submarine models. Luo et al [119] and Li et al [120] have used overlapping grids to more accurately simulate the motion of submarine models. They have discovered that compared to traditional inflow methods, the results obtained using overlapping grids have high accuracy and can fully reflect the ascent and spreading process of thermal wakes, especially the vortex characteristics.…”

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

View full text Add to dashboard Cite

show abstract

“…When the target dives to a certain depth, the water surface is clam, and we cannot track it by optical images. The thermal signatures of the wake formed by the discharge of cooling water, and the disturbance of temperature-stratifified ocean under the action of the propeller are able to be clearly visible on the infrared image [10]. However, water has a high specific heat, making thermal energy decay rapidly.…”

Section: Introductionmentioning

confidence: 99%

An Underwater Target Wake Detection in Multi-Source Images Based on Improved YOLOv5

Shi

2023

IEEE Access

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In the marine environment, underwater targets improve "stealth" performance through innovation in technology, so traditional target tracking methods are difficult to use for tracking underwater targets stably and accurately. This paper proposes an improved YOLOv5 (You Look Only Once) based method to detect wake of underwater target accurately in multi-source images. We obtain optical images and thermal images through model simulation and scaled experiment. Improve the generalization ability of the detection network through data augmentation. The proposed method introduces linear features detection to enhance feature propagation, and promote feature reuse. The result shows that the proposed method is better than the original object detection algorithms. The improved algorithm can detect underwater targets status (underwater or surface) and image types (optical wake or thermal wake).

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Large eddy simulation of round jets with mild temperature difference

Qin,

Chen,

Shan

et al. 2024

International Journal of Mechanical Sciences

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Simulation Study on Thermal Wake Characteristics of Underwater Vehicle under Rotary Motion

Cited by 4 publications

References 12 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

An Underwater Target Wake Detection in Multi-Source Images Based on Improved YOLOv5

Large eddy simulation of round jets with mild temperature difference

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