Numerical simulations of propeller cavitation flows based on OpenFOAM

Zhao, Minsheng; Zhao, Weiwen; Wan, Decheng

doi:10.1007/s42241-020-0071-8

Cited by 29 publications

(5 citation statements)

References 21 publications

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“…Several Reynolds-averaged Navier-Stokes (RANS) computations on the subject were reported (see, for instance, Hong & Dong 2010;Morgut & Nobile 2012;Baek et al 2015;Paik et al 2015;Wang et al 2017Wang et al , 2018Heydari & Sadat-Hosseini 2020;Zhao, Zhao & Wan 2020). Unfortunately, although RANS was demonstrated to be an appropriate tool for the prediction of the global performance of marine propellers, it is inherently not well suited to reproduce the instability mechanism typical of their wake, since turbulence is fully modelled, rather than resolved (Cai, Li & Liu 2019).…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of turbulence at the core of the tip and hub vortices shed by a marine propeller

Posa

2023

J. Fluid Mech.

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Large-eddy simulation on a grid consisting of 5 billion points was utilized to study the properties of turbulence at the core of the tip and hub vortices shed by a marine propeller across working conditions. Turbulence at the core of the tip vortices was found to be initially isotropic, moving towards a ‘cigar-shaped’ axisymmetric state as instability grows, dominated by turbulent fluctuations of the velocity component directed in the radial direction of the cylindrical reference frame centred at the wake axis. The break-up of the coherence of the tip vortices is instead characterized by turbulence recovering an isotropic state. This process is accelerated by growing load conditions of the propeller. In contrast, during instability of the hub vortex, turbulence at its core develops a ‘pancake-shaped’ axisymmetric state, dominated by the fluctuations of the radial and azimuthal velocities. However, at higher propeller loads turbulence at the core of the hub vortex keeps close to isotropy, thanks to a faster instability. Within both tip and hub vortices the deviations from Boussinesq's hypothesis were found very significant, providing evidence of the unsuitability of conventional turbulence modelling. At the core of the tip vortices they become especially large at their break-up and for increasing load conditions of the propeller, equivalent to more intense structures. In contrast, at the core of the hub vortex they were verified to be decreasing functions of the propeller load.

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Section: Introductionmentioning

confidence: 99%

Anisotropy of turbulence at the core of the tip and hub vortices shed by a marine propeller

Posa

2023

J. Fluid Mech.

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“…CFD packages such as ANSYS Fluent [25], Siemens STAR-CCM+ [26], and the open-source solution OpenFOAM [27] have also been used widely to predict the performance of propellers. Zhao et al [28] conducted numerical simulations of propeller cavitation flows using OpenFOAM. Vijayanandh et al [29] performed comparative fatigue life estimations of a marine propeller using ANSYS Fluent.…”

Section: Introductionmentioning

confidence: 99%

A 3-D Viscous Vorticity Model for Predicting Turbulent Flows over Hydrofoils

You,

Kinnas

2023

JMSE

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This research addresses the demand for a computationally efficient numerical tool capable of predicting 3-D turbulent flows over 3-D hydrofoils, a critical step in ultimately addressing marine propeller or turbine performance. The related software development and its applications are conducted by employing the vorticity-based approach known as the viscous vorticity equation (VISVE). In particular, an existing 3-D laminar VISVE solver was modified in order to handle 3-D turbulent flow scenarios. The extension incorporates the k−ω SST model into the 3-D VISVE solver by using the finite volume method (FVM), thereby broadening its application to turbulent flows. The model was then tested in the case of turbulent flows over 3-D hydrofoils. The results were found to not be sensitive to either grid or time step size and to be in very good agreement with those obtained using a Reynolds-averaged Navier–Stokes (RANS) solver. This solver offers distinct advantages, including a significantly reduced computational domain size and reduced computational costs through its vorticity-based approach. Notably, turbulence concentration within boundary layers and free shear flows does not compromise the method’s computational efficiency. The simplified meshing process, which automatically generates the grids based on the number of panels on the hydrofoil, enhances accessibility for researchers and engineers.

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“…A vortex is a special form of fluid motion, which has unsteady and nonlinear characteristics [4]. The universality and complexity of vortex motion make it an enduring research frontier in the theoretical and applied research of hydrodynamics [5]. The vortex formed at the inlet of a pump station is generally divided into a free surface vortex and submerged vortex.…”

Section: Introductionmentioning

confidence: 99%

Study on the Vortex in a Pump Sump and Its Influence on the Pump Unit

Song

Liu

Wang

2022

JMSE

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The vortex in a pump sump is a negative problem for the pump unit, which can lead to the decline of pump performance. Focusing on the internal pressure characteristics of the floor-attached vortex (FAV) and its influence on the pump unit, the FAV was analyzed adopting the previously verified numerical simulation method and experiment. The results show that the pressure in the vortex core gradually decreases with time, drops to a negative pressure at the development stage, and then reaches the lowest pressure during the continuance stage. When the negative pressure of the vortex tube is around the vaporization pressure of the continuance stage, it can cause a local cavitation at the impeller inlet. The evolution of the FAV is accompanied by a change of pressure gradient in the vortex core which is discussed in detail. This research provides theoretical guidance for a better understanding of the vortex characteristics and the optimal design for the pump.

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Numerical simulations of propeller cavitation flows based on OpenFOAM

Cited by 29 publications

References 21 publications

Anisotropy of turbulence at the core of the tip and hub vortices shed by a marine propeller

Anisotropy of turbulence at the core of the tip and hub vortices shed by a marine propeller

A 3-D Viscous Vorticity Model for Predicting Turbulent Flows over Hydrofoils

Study on the Vortex in a Pump Sump and Its Influence on the Pump Unit

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