A comparative DES study of wake vortex evolution for ducted and non-ducted propellers

Gong, Jie; Guo, Chunyu; Zhao, Dagang; Wu, Tiecheng; Song, Ke-wei

doi:10.1016/j.oceaneng.2018.04.054

Cited by 59 publications

(18 citation statements)

References 24 publications

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“…These kind of phenomena are not directly analyzed in present work, since simulations were performed with RANS and with the assumption of steady flow, not allowing for the computation of vortex instabilities and fluctuations. These features can be addressed only by using more demanding unsteady LES or DES approaches which are able (e.g., [46]) to predict the vortex breakup in the propeller which was experimentally observed in [19].…”

Section: Flow Field Analysismentioning

confidence: 99%

Numerical and Experimental Comparison of Ducted and Non-Ducted Propellers

Villa

Gaggero

Tani

et al. 2020

JMSE

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Ducted propellers are unconventional systems that are usually adopted for ship propulsion. These devices have recently been studied with medium-fidelity computational fluid dynamics code (based on the potential flow hypothesis) with promising results. However, these tools, even though they provide a good prediction of the forces and moments generated by the blades and the duct, are not able to provide insight into the flow field characteristics due to their crude flow approximations. On the contrary, modern high-fidelity viscous-based computational fluid dynamics codes could give a better description of the near and far-field flow of these particular devices. In the present paper, forces and the most significant features of the flow field around two ducted propellers are analyzed by means of both experimental and computational fluid dynamics approaches. In particular, accelerating and decelerating ducts are considered, and we demonstrate the ability of the adopted solver to accurately predict the performance and the flow field for both types. These results, in particular for the less-studied decelerating duct, designate CFD as a useful tool for reliable designs.

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Section: Flow Field Analysismentioning

confidence: 99%

Numerical and Experimental Comparison of Ducted and Non-Ducted Propellers

Villa

Gaggero

Tani

et al. 2020

JMSE

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“…As the propeller has a finite number of blades, the flow field in its wake is generally non-uniform. This has been confirmed using the laser Doppler velocimetry method and numerical studies (Felli et al, 2008;Gong et al, 2018;Stella et al, 2000;Zhang & Jaiman, 2019). The properties of complex propeller wake fields are generally dependent on the number of blades or blade passing frequency (BPF).…”

Section: Introductionmentioning

confidence: 75%

Numerical simulation of structural response during propeller-rudder interaction

Zhang

Chen

Wang

et al. 2021

Engineering Applications of Computational Fluid Mechanics

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The propeller wake can cause vibrations on the rudder surface, which worsen the noise and reliability. The vibration monitoring of the rudder operating in the propeller wake with fluid-structure interaction (FSI) method is still challenging. In the present study, the structural response during propeller-rudder interaction is investigated using detached eddy simulation. Three-dimensional distributions of loads, stresses, and deformations are discussed. The leading and trailing edges exhibit the strongest deformations in opposite directions, which are S-shaped. The strongest lateral deformation occurs between the tip vortex and hub vortex regions. In the tip vortex region, the dominant lateral vibrations fluctuate at the blade passing frequency (BPF) and shaft frequency (SF). However, the 75 Hz-fluctuation becomes significant at the trailing edge of the rudder. In the hub vortex region, the lateral deformation fluctuates mainly at 75 Hz except the area near the leading edge. There are weak vibrations occurring at the natural frequencies of the rudder when the natural frequencies of the rudder are much higher than the SF and BPF. However, the plate in the propeller suffers intense vibrations at the frequencies near the natural frequencies, where the natural frequencies of the plate are close to SF and BPF.

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“…The time histories and frequency domain of the thrust coefficient K T are shown in Figure 10a When the LES model is used, the effect of turbulent fluctuations on propeller performance should be analyzed. Many researchers carried out the analysis the PSDs of the different signals [38][39][40]. Therefore, the PSD of the thrust coefficient was investigated in the present paper.…”

Section: Power Spectral Density (Psd)mentioning

confidence: 99%

A Numerical Investigation of a Winglet-Propeller Using an LES Model

Zhu

Gao

2019

JMSE

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The generation of tip vortex cavitation (TVC) is a common phenomenon in marine propellers. Therefore, it is important to find a way for the effective suppression of TVC. Based on the enlightenment of bionics, a propeller with winglets was numerically investigated by using a large eddy simulation (LES) model and the commercial software STAR-CCM+. Various variables, such as mesh size, number of prism layers, vapor properties and time step, were analyzed using the benchmark MAU5-80 propeller. The open water characteristics calculated for the benchmark propeller were compared with experimental data. The meshes in the region of the tip vortex wake were refined. The power spectral density (PSD) of the thrust coefficient and axial velocity were investigated. The comparison of TVC between the benchmark propeller and the propeller with winglets was studied with the Q-criterion, helicity and volume fraction of the vapor. The strength of the tip vortex wake is weakened by winglets; therefore, the presence of winglets leads to a reduction in vapor volume, which in turn alleviates TVC.

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A comparative DES study of wake vortex evolution for ducted and non-ducted propellers

Cited by 59 publications

References 24 publications

Numerical and Experimental Comparison of Ducted and Non-Ducted Propellers

Numerical and Experimental Comparison of Ducted and Non-Ducted Propellers

Numerical simulation of structural response during propeller-rudder interaction

A Numerical Investigation of a Winglet-Propeller Using an LES Model

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