Two-dimensional convective turbulence

A. V. Gruzinov, Nikolai Kukharkin, R. N. Sudan

    Research output: Contribution to journalArticle

    Abstract

    We show that 2D E X B ionospheric turbulence of the electron density in the equatorial electrojet is isomorphic to the viscous convection of an ordinary fluid in a porous medium due to temperature gradients. Numerical simulations reveal the strong anisotropy in the turbulence, which consists of rising hot bubbles and falling cool bubbles. These bubbles break up into fingers leading to the formation of stable shear flows. After reaching a quasisteady state, the omnidirectional energy spectrum approaches a k-2 behavior, rather than k-5/3 as expected from isotropic turbulence. Physical mechanisms that lead to anisotropy are analyzed.

    Original languageEnglish (US)
    Pages (from-to)1260-1263
    Number of pages4
    JournalPhysical Review Letters
    Volume76
    Issue number8
    StatePublished - Feb 19 1996

    Fingerprint

    bubbles
    turbulence
    equatorial electrojet
    anisotropy
    isotropic turbulence
    falling
    shear flow
    ionospherics
    temperature gradients
    energy spectra
    convection
    fluids
    simulation

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Gruzinov, A. V., Kukharkin, N., & Sudan, R. N. (1996). Two-dimensional convective turbulence. Physical Review Letters, 76(8), 1260-1263.

    Two-dimensional convective turbulence. / Gruzinov, A. V.; Kukharkin, Nikolai; Sudan, R. N.

    In: Physical Review Letters, Vol. 76, No. 8, 19.02.1996, p. 1260-1263.

    Research output: Contribution to journalArticle

    Gruzinov, AV, Kukharkin, N & Sudan, RN 1996, 'Two-dimensional convective turbulence', Physical Review Letters, vol. 76, no. 8, pp. 1260-1263.
    Gruzinov AV, Kukharkin N, Sudan RN. Two-dimensional convective turbulence. Physical Review Letters. 1996 Feb 19;76(8):1260-1263.
    Gruzinov, A. V. ; Kukharkin, Nikolai ; Sudan, R. N. / Two-dimensional convective turbulence. In: Physical Review Letters. 1996 ; Vol. 76, No. 8. pp. 1260-1263.
    @article{f394b6b8491e4dcfb6982d65c93aae3e,
    title = "Two-dimensional convective turbulence",
    abstract = "We show that 2D E X B ionospheric turbulence of the electron density in the equatorial electrojet is isomorphic to the viscous convection of an ordinary fluid in a porous medium due to temperature gradients. Numerical simulations reveal the strong anisotropy in the turbulence, which consists of rising hot bubbles and falling cool bubbles. These bubbles break up into fingers leading to the formation of stable shear flows. After reaching a quasisteady state, the omnidirectional energy spectrum approaches a k-2 behavior, rather than k-5/3 as expected from isotropic turbulence. Physical mechanisms that lead to anisotropy are analyzed.",
    author = "Gruzinov, {A. V.} and Nikolai Kukharkin and Sudan, {R. N.}",
    year = "1996",
    month = "2",
    day = "19",
    language = "English (US)",
    volume = "76",
    pages = "1260--1263",
    journal = "Physical Review Letters",
    issn = "0031-9007",
    publisher = "American Physical Society",
    number = "8",

    }

    TY - JOUR

    T1 - Two-dimensional convective turbulence

    AU - Gruzinov, A. V.

    AU - Kukharkin, Nikolai

    AU - Sudan, R. N.

    PY - 1996/2/19

    Y1 - 1996/2/19

    N2 - We show that 2D E X B ionospheric turbulence of the electron density in the equatorial electrojet is isomorphic to the viscous convection of an ordinary fluid in a porous medium due to temperature gradients. Numerical simulations reveal the strong anisotropy in the turbulence, which consists of rising hot bubbles and falling cool bubbles. These bubbles break up into fingers leading to the formation of stable shear flows. After reaching a quasisteady state, the omnidirectional energy spectrum approaches a k-2 behavior, rather than k-5/3 as expected from isotropic turbulence. Physical mechanisms that lead to anisotropy are analyzed.

    AB - We show that 2D E X B ionospheric turbulence of the electron density in the equatorial electrojet is isomorphic to the viscous convection of an ordinary fluid in a porous medium due to temperature gradients. Numerical simulations reveal the strong anisotropy in the turbulence, which consists of rising hot bubbles and falling cool bubbles. These bubbles break up into fingers leading to the formation of stable shear flows. After reaching a quasisteady state, the omnidirectional energy spectrum approaches a k-2 behavior, rather than k-5/3 as expected from isotropic turbulence. Physical mechanisms that lead to anisotropy are analyzed.

    UR - http://www.scopus.com/inward/record.url?scp=0010897763&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=0010897763&partnerID=8YFLogxK

    M3 - Article

    VL - 76

    SP - 1260

    EP - 1263

    JO - Physical Review Letters

    JF - Physical Review Letters

    SN - 0031-9007

    IS - 8

    ER -