Method of characteristics in quasi-steady compressible flows

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    Abstract

    Differences are highlighted between applications of the method of characteristics (MOC) to compressible and incompressible flows. Attention is focussed on regions of steady or nearly-steady flow that commonly occur locally within general unsteady flows. It is shown that, except at very small Mach numbers, fixed-grid MOC methods can give strongly distorted predictions of axial variations of pressure and velocity. Furthermore, integration time steps chosen for maximum accuracy in one location are likely to be less suitable in other locations. Whilst greatest attention is paid to flows with moderate subsonic Mach numbers, a second purpose of the paper is to show why classical applications of fixed-grid MOC to liquid transients in pipes are inherently incapable of modelling steady flows exactly.
    Original languageEnglish
    Title of host publicationBHR Group - Surge Analysis - System Design, Simulation, Monitoring and Control, 10th International Conference on Pressure Surges
    PublisherBHR Group
    Pages505-518
    Number of pages14
    ISBN (Print)978-185598095-2
    Publication statusPublished - 2008
    Event10th International Conference on Pressure Surges - Edinburgh, United Kingdom
    Duration: 14 May 200816 May 2008
    http://www.bhrconferences.com/pressure_surges_10.aspx

    Conference

    Conference10th International Conference on Pressure Surges
    CountryUnited Kingdom
    CityEdinburgh
    Period14/05/0816/05/08
    Internet address

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  • Cite this

    Vardy, A. E. (2008). Method of characteristics in quasi-steady compressible flows. In BHR Group - Surge Analysis - System Design, Simulation, Monitoring and Control, 10th International Conference on Pressure Surges (pp. 505-518). BHR Group. http://www.bhrgroup.com/conferences/pressure_surges_10.aspx