Three-dimensional numerical analysis of development of unsteady structures in a processing jet

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The objective of this work is to study the initial development of structures in a three-dimensional precessing jet. To encourage the roll up of the jet shear layer, the inlet velocity profile is perturbed temporally by a sinusoidal disturbance. The frequency of the perturbation corresponds to the most amplified frequency of an axisymmetric jet, which is determined by two-dimensional numerical simulations. For a jet of Reynolds number 650, the maximally amplified frequency corresponded to a Strouhal number of approximately 0.39. Three dimensional numerical simulations were carried out to study the formation of structures in a precessing jet. The initial wariness of the shear layer and downstream propagation of structures could be observed. The rotating cross flow tends to deflect the structures azimuthally as they propagate downstream. Two kinds of structures were observed in a precessing jet. The fast kind is related to the roll up of the shear layer, and the other is related to the formation of a horseshoe type vortex which is seen in jets in cross flow. It was found that the former structures are considerably stronger than the latter.

    Original languageEnglish (US)
    Title of host publicationAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
    Editors Anon
    PublisherASME
    StatePublished - 1998
    EventProceedings of the 1998 ASME Fluids Engineering Division Summer Meeting - Washington, DC, USA
    Duration: Jun 21 1998Jun 25 1998

    Other

    OtherProceedings of the 1998 ASME Fluids Engineering Division Summer Meeting
    CityWashington, DC, USA
    Period6/21/986/25/98

    Fingerprint

    Numerical analysis
    Processing
    Strouhal number
    Computer simulation
    Vortex flow
    Reynolds number

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

    Cite this

    Manohar, S. S., Pauley, L., & Kulkarni, A. K. (1998). Three-dimensional numerical analysis of development of unsteady structures in a processing jet. In Anon (Ed.), American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED ASME.
    Manohar, Shailesh S. ; Pauley, Laura ; Kulkarni, Anil Kamalakant. / Three-dimensional numerical analysis of development of unsteady structures in a processing jet. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. editor / Anon. ASME, 1998.
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    Manohar, SS, Pauley, L & Kulkarni, AK 1998, Three-dimensional numerical analysis of development of unsteady structures in a processing jet. in Anon (ed.), American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. ASME, Proceedings of the 1998 ASME Fluids Engineering Division Summer Meeting, Washington, DC, USA, 6/21/98.

    Three-dimensional numerical analysis of development of unsteady structures in a processing jet. / Manohar, Shailesh S.; Pauley, Laura; Kulkarni, Anil Kamalakant.

    American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. ed. / Anon. ASME, 1998.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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    AU - Kulkarni, Anil Kamalakant

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    N2 - The objective of this work is to study the initial development of structures in a three-dimensional precessing jet. To encourage the roll up of the jet shear layer, the inlet velocity profile is perturbed temporally by a sinusoidal disturbance. The frequency of the perturbation corresponds to the most amplified frequency of an axisymmetric jet, which is determined by two-dimensional numerical simulations. For a jet of Reynolds number 650, the maximally amplified frequency corresponded to a Strouhal number of approximately 0.39. Three dimensional numerical simulations were carried out to study the formation of structures in a precessing jet. The initial wariness of the shear layer and downstream propagation of structures could be observed. The rotating cross flow tends to deflect the structures azimuthally as they propagate downstream. Two kinds of structures were observed in a precessing jet. The fast kind is related to the roll up of the shear layer, and the other is related to the formation of a horseshoe type vortex which is seen in jets in cross flow. It was found that the former structures are considerably stronger than the latter.

    AB - The objective of this work is to study the initial development of structures in a three-dimensional precessing jet. To encourage the roll up of the jet shear layer, the inlet velocity profile is perturbed temporally by a sinusoidal disturbance. The frequency of the perturbation corresponds to the most amplified frequency of an axisymmetric jet, which is determined by two-dimensional numerical simulations. For a jet of Reynolds number 650, the maximally amplified frequency corresponded to a Strouhal number of approximately 0.39. Three dimensional numerical simulations were carried out to study the formation of structures in a precessing jet. The initial wariness of the shear layer and downstream propagation of structures could be observed. The rotating cross flow tends to deflect the structures azimuthally as they propagate downstream. Two kinds of structures were observed in a precessing jet. The fast kind is related to the roll up of the shear layer, and the other is related to the formation of a horseshoe type vortex which is seen in jets in cross flow. It was found that the former structures are considerably stronger than the latter.

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    Manohar SS, Pauley L, Kulkarni AK. Three-dimensional numerical analysis of development of unsteady structures in a processing jet. In Anon, editor, American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. ASME. 1998