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Compressibility effect in vortex identification

Result description

It is shown that from the four most popular vortex-identification schemes (Q, ?, ?2, and ?ci) only the ?-criterion and the associated ?ci-criterion are extendable to compressible flows. Both criteria fulfill a specific condition conveniently expressed for compressible flows in terms of the invariants of the deviatoric part of the velocity-gradient tensor. It should be noted that if the Q-criterion is a priori redefined in terms of a deviatoric part of the strain-rate tensor, it will also be applicable to compressible flows.

Keywords

vortexvortex identificationcompressible flowscompressibility effect

The result's identifiers

Alternative languages

  • Result language

    angličtina

  • Original language name

    Compressibility effect in vortex identification

  • Original language description

    It is shown that from the four most popular vortex-identification schemes (Q, ?, ?2, and ?ci) only the ?-criterion and the associated ?ci-criterion are extendable to compressible flows. Both criteria fulfill a specific condition conveniently expressed for compressible flows in terms of the invariants of the deviatoric part of the velocity-gradient tensor. It should be noted that if the Q-criterion is a priori redefined in terms of a deviatoric part of the strain-rate tensor, it will also be applicable to compressible flows.

  • Czech name

    Efekt stlačitelnosti při identifikaci víru

  • Czech description

    Je ukázáno, že ze čtyř nejpopulárnějších metod identifikace vírů (Q, ?, ?2 a ?ci) pouze ?-kritérium a přidružené ?ci-kritérium jsou rozšiřitelné pro stlačitelné proudění. Obě kritéria splňují specifickou podmínku pro stlačitelné proudění vhodně vyjádřenou prostřednictvím invariantů deviatorické části tenzoru rychlostního gradientu. Nutno poznamenat, že pokud Q-kritérium bude a priori předefinováno prostřednictvím deviatorické části tenzoru rychlosti deformace, bude rovněž použitelné pro stlačitelné proudění.

Classification

  • Type

    Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    BK - Liquid mechanics

  • OECD FORD branch

Result continuities

Others

  • Publication year

    2009

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    AIAA Journal

  • ISSN

    0001-1452

  • e-ISSN

  • Volume of the periodical

    47

  • Issue of the periodical within the volume

    2

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    3

  • Pages from-to

  • UT code for WoS article

    000263047200018

  • EID of the result in the Scopus database