CFD predictions of unsteady cavitation for a marine propeller in oblique inflow

Viitanen, Ville; Sipilä, Tuomas; Sánchez-Caja, Antonio; Siikonen, Timo

doi:10.1016/j.oceaneng.2022.112596

Cited by 9 publications

(3 citation statements)

References 24 publications

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“…A discrete spherical bubble model is adopted to describe the motion and dynamics of nuclei. The motion trajectory of a nucleus that is subject to forces is decided by Newton's second law given by Equations ( 4) and (5):…”

Section: Discrete Bubble Modelmentioning

confidence: 99%

“…Cavitation, a common fluid mechanics phenomenon, refers to the microbubbles' (also known as nuclei) explosive growth resulting from liquid evaporation caused by local low pressure (i.e., the pressure is lower than the saturated vapor pressure at the corresponding temperature) in a liquid flow system, which is particularly common among various hydraulic turbines, pumps, and ship propellers [1][2][3]. Tip vortex cavitation, the earliest type of cavitation that occurs on real ship propellers due to the scale effect [4], will lead to significant pulsating pressure and strong radiation noise, degrading the ship's stealth performance significantly [5,6]. Studies [7][8][9][10] have shown that constant saturated vapor pressure alone cannot be used as a discrimination criterion, because the motion and growth of nuclei in the water have a considerable influence on the occurrence of TVC.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Method to Determine the Inception of Propeller Tip Vortex Cavitation Based on Bubble Dynamics

Duan,

Xu,

Cui

et al. 2024

Applied Sciences

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Due to the scale effect, tip vortex cavitation (TVC) is the earliest type of cavitation that occurs on real ship propellers. As a result, experts in the ship field have been paying close attention to the accurate prediction of propeller TVC inception for a long time. The motion and growth of the microscopic nuclei in the water have a significant influence on TVC inception. However, the minimum pressure coefficient method—a common method at present—based on the traditional Eulerian framework, neglects the influence of microscopic nuclei and therefore cannot accurately predict the cavitation inception. Moreover, the numerical prediction method for cavitation inception, which is based on bubble dynamics models and considers the influence of nuclei, has not established a set of unified and specific discrimination criteria applicable to propeller cavitation inception. In order to make up for the shortcomings of traditional prediction models and the existing methods based on bubble dynamics in the prediction of TVC inception, we propose a new discrimination method for propeller TVC inception based on bubble dynamics in this paper. The comparison with experimental results demonstrates that our proposed method allows us to predict propeller TVC inception more accurately. In addition, the effect mechanism of tip vortex flow characteristics on nuclei evolution is further investigated, and it is found that when approaching the low-pressure region at a vortex core under the influence of tip vortex suction, nuclei grow explosively under the continuous action of the low pressure at the vortex core until they reach their maximum sizes and then collapse rapidly.

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Section: Discrete Bubble Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Method to Determine the Inception of Propeller Tip Vortex Cavitation Based on Bubble Dynamics

Duan,

Xu,

Cui

et al. 2024

Applied Sciences

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“…Viitanen et al [13] investigated propeller cavitation on model and full-scale marine propellers and in a more realistic propeller setup. Additionally, propeller performance in the presence of cavitation on oblique flows has been investigated, with a PPTC propeller being popular in this set up [14,15]. Vaz et al [16] conducted an extensive study on marine propellers, especially behind a wake using RANS and RANS-BEMS (Boundary Element Methods) coupled approaches.…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis of Cavitating Flows around a Marine Propeller Using Incompressible, Isothermal Compressible, and Fully Compressible Flow Solvers

Ng’aru,

Park

2023

JMSE

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This research investigates cavitation around a marine propeller, employing computational fluid dynamic (CFD) solvers, including an incompressible, isothermal compressible, and fully compressible flow. The investigation commenced with simulations utilizing an incompressible flow solver, subsequently extending to the two compressible flow solvers. In the compressible flow, there is a close interrelation between density, pressure, and temperature, which significantly influences cavitation dynamics. To verify computational methods, verification tests were conducted for leading-edge cavitating flows over a two-dimensional (2D)-modified NACA66 hydrofoil section at various cavitation numbers. The computational results were validated against the experimental data, with the solvers’ capability to predict cavitation forming the basis for comparison. The results demonstrate consistent predictions among the solvers; however, the fully compressible flow solver demonstrated a superior performance in capturing re-entrant jets and accurately modeling cavity closure regions. Furthermore, the fully compressible flow solver precisely estimated propeller hydrodynamic performance, yielding results closely aligned with experimental observations.

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Numerical investigation of the cavitation noise around a marine propeller focusing on the influence of ventilation

Lyu,

Ji,

Wang

et al. 2023

J Hydrodyn

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CFD predictions of unsteady cavitation for a marine propeller in oblique inflow

Cited by 9 publications

References 24 publications

Numerical Method to Determine the Inception of Propeller Tip Vortex Cavitation Based on Bubble Dynamics

Numerical Method to Determine the Inception of Propeller Tip Vortex Cavitation Based on Bubble Dynamics

Computational Analysis of Cavitating Flows around a Marine Propeller Using Incompressible, Isothermal Compressible, and Fully Compressible Flow Solvers

Numerical investigation of the cavitation noise around a marine propeller focusing on the influence of ventilation

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