Large Eddy Simulation of turbulent vortex-cavitation interactions in transient sheet/cloud cavitating flows

Huang, Biao; Zhang, Yu; Wang, Guoyu

doi:10.1016/j.compfluid.2013.12.024

Cited by 229 publications

(44 citation statements)

References 25 publications

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“…b Zwart's model. c LVC model Qin's [12] and Huang's [35] studies indicated that sheet/-cloud cavitation produces unsteady lift for most hydrofoils. Thus, one can use a lift analysis to compare better the unsteadiness of cloud cavitation.…”

Section: Computational Setupmentioning

confidence: 99%

A cavitation model for computations of unsteady cavitating flows

2015

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A local vortical cavitation (LVC) model for the computation of unsteady cavitation is proposed. The model is derived from the Rayleigh-Plesset equations, and takes into account the relations between the cavitation bubble radius and local vortical effects. Calculations of unsteady cloud cavitating flows around a Clark-Y hydrofoil are performed to assess the predictive capability of the LVC model using well-documented experimental data. Compared with the conventional Zwart's model, better agreement is observed between the predictions of the LVC model and experimental data, including measurements of time-averaged flow structures, instantaneous cavity shapes and the frequency of the cloud cavity shedding process. Based on the predictions of the LVC model, it is demonstrated that the evaporation process largely concentrates in the core region of the leading edge vorticity in accordance with the growth in the attached cavity, and the condensation process concentrates in the core region of the trailing edge vorticity, which corresponds to the spread of the rear component of the attached cavity. When the attached cavity breaks up and moves downstream, the condensation area fully transports to the wake region, which is in accordance with the dissipation of the detached cavity. Furthermore, using vorticity transport equations, we also find that the periodic formation, breakup, and shedding of the sheet/cloud cavities, along with the associated baroclinic torque, are important mechanisms for vorticity production and modification. When the attached cavity grows, the liquid-vapour interface that moves towards the trailing edge enhances the vorticity in the attached cav-B Guoyu Wang ity closure region. As the re-entrant jet moves upstream, the wavy/bubbly cavity interface enhances the vorticity near the trailing edge. At the end of the cycle, the break-up of the stable attached cavity is the main reason for the vorticity enhancement near the suction surface.

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Section: Computational Setupmentioning

confidence: 99%

A cavitation model for computations of unsteady cavitating flows

2015

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“…Their numerical results were in good agreement with the experiment, and presented various cavitation details and mechanisms. Moreover, some favorable results have also been published (Dittakavi et al, 2010;Huang et al, 2014;Ji et al, 2013Ji et al, , 2015Roohi et al, 2013;Wang and Ostoja-Starzewski, 2007;Wang et al, 2016aWang et al, , 2016b. Besides, some new approaches are developed to simulate the cavitating flow and get favorable results (Ma et al, 2010;Ma et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation on cloud cavitating flow around an axisymmetric projectile near the wall with emphasis on the analysis of local cavity shedding

Wang

Huang

et al. 2017

Ocean Engineering

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“…Huang et al [12] characterized the prevailing mechanism and described the various phases of cloud cavitation development and vortex shedding taking place at the trailing edge of a benchmark hydrofoil. The coherent vortices that emerge at the hydrofoil trailing edge and the underlying onset mechanisms have been thoroughly discussed.…”

Section: Introductionmentioning

confidence: 99%

Cloud cavitation vortex shedding inside an injector nozzle

Mitroglou

Stamboliyski

Karathanassis

et al. 2017

Experimental Thermal and Fluid Science

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Abstract. The development and collapse of cloud cavitation and its link to surface erosion within a transparent test single-orifice nozzle operating with a closed Diesel fuel hydraulic circuit, has been characterized using high-speed imaging. Data have been obtained for a range of cavitation and Reynolds numbers under fixed lift positions. Post processing of a large number of images acquired with short exposure time (1μs) allowed the elucidation of the distinct flow phenomena associated with the highly transient two-phase flow. At the inlet of the flow orifice, the vapour cloud was found to occupy the largest part of the nozzle hole crosssection. Coherent vortical structures of a hairpin shape have been detected to onset at the closure region of this vapour cloud and shed downstream in a fully transient manner. The effect of the operating parameters on the temporal and spatial characteristics with regards to the emergence and collapse of the hairpin vortices has been quantified. It has been established that the cavitation-vortex shedding was taking place in a periodical manner, characterized by a Strouhal number. Permanent repository link

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Large Eddy Simulation of turbulent vortex-cavitation interactions in transient sheet/cloud cavitating flows

Cited by 229 publications

References 25 publications

A cavitation model for computations of unsteady cavitating flows

A cavitation model for computations of unsteady cavitating flows

Experimental and numerical investigation on cloud cavitating flow around an axisymmetric projectile near the wall with emphasis on the analysis of local cavity shedding

Cloud cavitation vortex shedding inside an injector nozzle

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