The thesis of this paper is that cavitation in hydraulic spool valves involves large-scale vortical structures in an unsteady submerged jet. Current computational fluid dynamics approaches do not accurately predict these unsteady vortices, nor do they properly account for bubble-dynamics/flow-structure interactions. The large eddy simulation turbulence model was considered to overcome these deficiencies. First, a commercial code was applied to study cavitation in a model spool valve, addressing the effects of including a cavitation model and the large eddy simulation turbulence model. Second, a research code was developed to study the effect of cavitation inception on vortex dynamics in a submerged planar jet. A previously developed cavitation model, which accounts for interactions between large-scale vortical structures and cavitation bubbles, was employed. Results were obtained which demonstrate that even low levels of cavitation have significant effects on the jet vortex dynamics, including vortex intensification and splitting. An analysis of the vorticity transport equation reveals the underlying mechanisms behind these effects.


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    Titel :

    Towards Large Eddy Simulation of Cavitation in Hydraulic Valves


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Ramadhyani, S. (Autor:in) / Frankel, S. H. (Autor:in) / Tao, X. (Autor:in)

    Kongress:

    International Off-Highway & Powerplant Congress & Exposition ; 2000



    Erscheinungsdatum :

    11.09.2000




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Towards large eddy simulation of cavitation in hydraulic valves

    Tao,X. / Frankel,S.H. / Ramadhyani,S. et al. | Kraftfahrwesen | 2000


    Large eddy simulation in hydraulic valves

    Tao,X. / Frankel,S.H. / Ramadhyani,S. et al. | Kraftfahrwesen | 2001


    Cavitation Behaviour of Hydraulic Orifices and Valves

    Ellman, A. U. / Koivula, T. S. | SAE Technical Papers | 1998



    Cavitation behavior of hydraulic orifices and valves

    Koivula,T.S. / Ellman,A.U. / Tampere Univ.of Technol.,Inst.of Hydraulics and Automat.,FI | Kraftfahrwesen | 1998