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    Direct Numerical Simulation of Single and Multiple Square Jets in Cross-Flow

    Source: Journal of Fluids Engineering:;2011:;volume( 133 ):;issue: 003::page 31201
    Author:
    Y. Yao
    ,
    M. Maidi
    DOI: 10.1115/1.4003588
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Direct numerical simulations (DNSs) have been carried out for single and multiple square jets issuing normally into a cross-flow, with the primary aim of studying the flow structures and interaction mechanisms associated with the jet in cross-flow (JICF) problems. The single JICF configuration follows a similar study previously done by (2004, Phys. Rev. E, 69, p. 066302) and the multiple JICF configurations are arranged side-by-side in the spanwise direction with a jet-to-jet adjacent edge distance (H) for the twin-jet case and an additional third jet downstream along the centerline with a jet-to-jet adjacent edge distance (L) for the triple-jet case. Simulations are performed for two twin-jet cases with H=1D,2D, respectively, and for one triple-jet case with H=1D, L=2D, where D is the jet exit width. Flow conditions similar to Sau et al. are considered, i.e., the jet to the cross-flow velocity ratio R=2.5 and the Reynolds number 225, based on the freestream velocity and the jet exit width. For the single jet in cross-flow, the vortical structures from our DNS are in good qualitative agreement with the findings of Sau et al. For the side-by-side twin-jet configuration, results have shown that the merging process of the two initially separated counter-rotating vortex pairs (CRVPs) from each jet hole exit is strongly dependent on the jet-to-jet adjacent edge distance H with earlier merging observed for the case H=1D. Downstream, the flow is dominated by a larger CRVP structure, accompanied by a smaller inner vortex pair. The inner vortex pair is found not to survive in the far-field as it rapidly dissipates before exiting the computational domain. These observations are in good agreement with the experimental findings in the literature. Simulations of the triple-jet in cross-flow case have shown some complicated jet-jet and jet-cross-flow interactions with three vortex pairs observed downstream, significantly different from that seen in the twin-jet cases. The evidence of these flow structures and interaction characteristics could provide a valuable reference database for future in-depth flow physics studies of laboratory experimental and numerical investigations.
    keyword(s): Flow (Dynamics) , Jets , Cross-flow , Computer simulation AND Vortices ,
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      Direct Numerical Simulation of Single and Multiple Square Jets in Cross-Flow

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    http://yetl.yabesh.ir/yetl1/handle/yetl/146370
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    contributor authorY. Yao
    contributor authorM. Maidi
    date accessioned2017-05-09T00:44:25Z
    date available2017-05-09T00:44:25Z
    date copyrightMarch, 2011
    date issued2011
    identifier issn0098-2202
    identifier otherJFEGA4-27454#031201_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/146370
    description abstractDirect numerical simulations (DNSs) have been carried out for single and multiple square jets issuing normally into a cross-flow, with the primary aim of studying the flow structures and interaction mechanisms associated with the jet in cross-flow (JICF) problems. The single JICF configuration follows a similar study previously done by (2004, Phys. Rev. E, 69, p. 066302) and the multiple JICF configurations are arranged side-by-side in the spanwise direction with a jet-to-jet adjacent edge distance (H) for the twin-jet case and an additional third jet downstream along the centerline with a jet-to-jet adjacent edge distance (L) for the triple-jet case. Simulations are performed for two twin-jet cases with H=1D,2D, respectively, and for one triple-jet case with H=1D, L=2D, where D is the jet exit width. Flow conditions similar to Sau et al. are considered, i.e., the jet to the cross-flow velocity ratio R=2.5 and the Reynolds number 225, based on the freestream velocity and the jet exit width. For the single jet in cross-flow, the vortical structures from our DNS are in good qualitative agreement with the findings of Sau et al. For the side-by-side twin-jet configuration, results have shown that the merging process of the two initially separated counter-rotating vortex pairs (CRVPs) from each jet hole exit is strongly dependent on the jet-to-jet adjacent edge distance H with earlier merging observed for the case H=1D. Downstream, the flow is dominated by a larger CRVP structure, accompanied by a smaller inner vortex pair. The inner vortex pair is found not to survive in the far-field as it rapidly dissipates before exiting the computational domain. These observations are in good agreement with the experimental findings in the literature. Simulations of the triple-jet in cross-flow case have shown some complicated jet-jet and jet-cross-flow interactions with three vortex pairs observed downstream, significantly different from that seen in the twin-jet cases. The evidence of these flow structures and interaction characteristics could provide a valuable reference database for future in-depth flow physics studies of laboratory experimental and numerical investigations.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleDirect Numerical Simulation of Single and Multiple Square Jets in Cross-Flow
    typeJournal Paper
    journal volume133
    journal issue3
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4003588
    journal fristpage31201
    identifier eissn1528-901X
    keywordsFlow (Dynamics)
    keywordsJets
    keywordsCross-flow
    keywordsComputer simulation AND Vortices
    treeJournal of Fluids Engineering:;2011:;volume( 133 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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