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    Experimental Investigation of a Three-Dimensional Boundary Layer Flow in the Vicinity of an Upright Wall Mounted Cylinder (Data Bank Contribution)

    Source: Journal of Fluids Engineering:;1992:;volume( 114 ):;issue: 004::page 566
    Author:
    J. H. Agui
    ,
    J. Andreopoulos
    DOI: 10.1115/1.2910069
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The flow of a three-dimensional boundary layer approaching an upright wall mounted circular cylinder has been experimentally investigated by means of instantaneous flow visualization techniques using a laser sheet and time resolved measurements of the wall pressure, the gradients of which are related to the vorticity flux away from the wall. The mean separation point of the oncoming boundary layer is located on the plane of symmetry, 0.76 and 0.82 diameters upstream of the cylinder for the two investigated Reynolds numbers, based on the cylinder diameter, of 1.0 × 105 and 2.2 × 105 , respectively. The present flow visualization studies have shown that there is always a primary vortex present in the flow which induces an eruption of wall fluid. Very often, this eruption results in the formation of counter rotating or mushroom vortices. A secondary vortex further upstream has been observed occasionally. This vortex, as well as the vortices formed by the fast eruption of wall fluid evolve quickly in time and space and therefore cannot be obtained from time-average measurements. The primary vortex consists of several large scale structures which have originated in the oncoming boundary layer and which have acquired substantial additional vorticity. Point measurements indicate that the r.m.s. pressure fluctuations increase as separation is approached and reach a maximum near reattachment. A low degree of space-time correlation and longer integral time scales were also observed downstream of separation. A bimodal probability density function of the fluctuating pressure was observed in the vicinity of the mean separation point, close to the corner region and in the wake of the cylinder. Quasi periodic vortex shedding from the cylinder with a Strouhal number 0.13 was also observed.
    keyword(s): Flow (Dynamics) , Cylinders , Boundary layers , Vortices , Separation (Technology) , Pressure , Measurement , Fluids , Flow visualization , Vorticity , Circular cylinders , Fluctuations (Physics) , Wakes , Corners (Structural elements) , Gradients , Probability , Vortex shedding , Lasers , Reynolds number , Spacetime AND Density ,
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      Experimental Investigation of a Three-Dimensional Boundary Layer Flow in the Vicinity of an Upright Wall Mounted Cylinder (Data Bank Contribution)

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/110381
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    • Journal of Fluids Engineering

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    contributor authorJ. H. Agui
    contributor authorJ. Andreopoulos
    date accessioned2017-05-08T23:38:40Z
    date available2017-05-08T23:38:40Z
    date copyrightDecember, 1992
    date issued1992
    identifier issn0098-2202
    identifier otherJFEGA4-27071#566_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/110381
    description abstractThe flow of a three-dimensional boundary layer approaching an upright wall mounted circular cylinder has been experimentally investigated by means of instantaneous flow visualization techniques using a laser sheet and time resolved measurements of the wall pressure, the gradients of which are related to the vorticity flux away from the wall. The mean separation point of the oncoming boundary layer is located on the plane of symmetry, 0.76 and 0.82 diameters upstream of the cylinder for the two investigated Reynolds numbers, based on the cylinder diameter, of 1.0 × 105 and 2.2 × 105 , respectively. The present flow visualization studies have shown that there is always a primary vortex present in the flow which induces an eruption of wall fluid. Very often, this eruption results in the formation of counter rotating or mushroom vortices. A secondary vortex further upstream has been observed occasionally. This vortex, as well as the vortices formed by the fast eruption of wall fluid evolve quickly in time and space and therefore cannot be obtained from time-average measurements. The primary vortex consists of several large scale structures which have originated in the oncoming boundary layer and which have acquired substantial additional vorticity. Point measurements indicate that the r.m.s. pressure fluctuations increase as separation is approached and reach a maximum near reattachment. A low degree of space-time correlation and longer integral time scales were also observed downstream of separation. A bimodal probability density function of the fluctuating pressure was observed in the vicinity of the mean separation point, close to the corner region and in the wake of the cylinder. Quasi periodic vortex shedding from the cylinder with a Strouhal number 0.13 was also observed.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleExperimental Investigation of a Three-Dimensional Boundary Layer Flow in the Vicinity of an Upright Wall Mounted Cylinder (Data Bank Contribution)
    typeJournal Paper
    journal volume114
    journal issue4
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.2910069
    journal fristpage566
    journal lastpage576
    identifier eissn1528-901X
    keywordsFlow (Dynamics)
    keywordsCylinders
    keywordsBoundary layers
    keywordsVortices
    keywordsSeparation (Technology)
    keywordsPressure
    keywordsMeasurement
    keywordsFluids
    keywordsFlow visualization
    keywordsVorticity
    keywordsCircular cylinders
    keywordsFluctuations (Physics)
    keywordsWakes
    keywordsCorners (Structural elements)
    keywordsGradients
    keywordsProbability
    keywordsVortex shedding
    keywordsLasers
    keywordsReynolds number
    keywordsSpacetime AND Density
    treeJournal of Fluids Engineering:;1992:;volume( 114 ):;issue: 004
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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