Large eddy simulation of unsteady shedding behavior in cavitating flows with time-average validation

Li, Linmin; Li, Baokuan; Hu, Zhiqiang; Yang, Lin; Cheung, Sherman C.P.

doi:10.1016/j.oceaneng.2016.07.065

Cited by 19 publications

(5 citation statements)

References 55 publications

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“…The RANS model is the most widely preferred and used approach for most CFD applications since it is computationally economical. LES has been used for the prediction of cavitation and related flows in respective bodies [2][3][4][5]. Bensow [6] conducted a simulation on Delft Twist11 foil using LES, DES, and RANS models, demonstrating the capabilities of LES and DES to capture details of the cavitation dynamic behavior, especially the shedding frequency.…”

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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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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“…Zhang et al (2015) studied the unstable cavitation desorption of the Clark-y hydrofoil by increasing the maximum density ratio, which improved the accuracy of numerical simulation. Li et al (2016) used the LES method to simulate the transient spatiotemporal flow of the Clark-y hydrofoil, which provided an effective numerical simulation framework for the study of cavitating flow. Ji et al (2015) used the LES method to numerically simulate the cavitating flow around the NACA66 hydrofoil to study the evolution of cavitation.…”

Section: Introductionmentioning

confidence: 99%

The Leading-Edge Structure Based on Geometric Bionics Affects the Transient Cavitating Flow and Vortex Evolution of Hydrofoils

Yan

Zhang

Jun-hua³

et al. 2022

Front. Energy Res.

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A hydrofoil is a fundamental structure in fluid machinery, and it is widely applied to the fields of propellers, blades of axial flow pumps and underwater machinery. To reveal that the geometric structure of the leading-edge of a hydrofoil is the mechanism that affects the transient cavitating flow, we regard the three fish-type leading-edge structures of mackerel, sturgeon and small yellow croaker as the research objects and use high-precision non-contact 3D scanners to establish three bionic hydrofoils (Mac./Stu./Cro.). We use large eddy simulation to simulate the transient cavitating flow of hydrofoils numerically and compare and analyze their lift–drag characteristics, the transient behavior of unsteady cavitation and the vortex evolution. The numerical simulation results are in good agreement with the experimental results. The warping of leading-edge structure will cause a change in lift–drag characteristics, and the Cro. hydrofoil has a good lift-to-drag ratio. When the leading-edge structure is tilted upward (Cro. hydrofoil), the position of the attached cavity will move forward, which will accelerate the cavitation evolution and improve the velocity fluctuation of the trailing edge. When the leading-edge structure is tilted downward (Stu. hydrofoil), the change in the vortex stretching and dilatation terms will be complex, and the influence area of the vortex will widen.

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“…As the sheet cavitation is an interface-dominated multiphase flow process, the accurate prediction of interface is the core issue. The volume of fluid (VOF) method has been regarded as a promising way for interface capturing [4] and is applicable to flows dominated by the interfacial motion including the vapor-liquid two-phase flow [5,6]. This method has been successfully applied in multiphase flow in gas-stirring ladle [7], cylindrical liquid jet [8], and flooding flow [9].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of cavitating flow around a twist hydrofoil focusing on the erosion behaviour

Wang

et al. 2022

J. Phys.: Conf. Ser.

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The erosion risk in cavitating flow is a challenging issue due to the instantaneity and complexity. In this paper, the energy balance approach (EBA)-based cavitation erosion model is employed to investigate the erosion behavior around a Delft Twist-11 hydrofoil utilizing large eddy simulation (LES) approach. The results show that the predicted erosion region is qualitative agreement with the experimental paint tests. The adaptive mesh refinement (AMR) method is conducted on a coarse mesh to verify its preponderance in save computing resources and ensuring accuracy. It is found that the case using AMR obtains more accurate cavitation features within less computational cells than that of the fine mesh, including the predicted shedding frequency and U-type structure of shedding cloud.

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Large eddy simulation of unsteady shedding behavior in cavitating flows with time-average validation

Cited by 19 publications

References 55 publications

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

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

The Leading-Edge Structure Based on Geometric Bionics Affects the Transient Cavitating Flow and Vortex Evolution of Hydrofoils

Numerical simulation of cavitating flow around a twist hydrofoil focusing on the erosion behaviour

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