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  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Organized motion in a very high Reynolds number jet (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1615-1623 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Direct visual observations of a high Reynolds number jet are presented. The jet consists of the exhaust plume of a TITAN IV rocket motor, which was discharged upward during ground-based testing producing an estimated Reynolds number of about 2×108. An overall view of the first 2000 ft of the resulting plume is observed and discussed. Image processing is used to enhance the plume appearance and reveal significant events associated with the jet evolution. The most striking finding is the progression of organized structures up through the jet, similar to those observed in laboratory flows at Reynolds numbers of 104. Significant differences are also seen between the time-averaged scalar field, which appears more Gaussian, and the instantaneous scalar field, which appears more top hat. It is concluded that the organization is associated with inviscid instability mechanisms that are Reynolds number independent, and that large-scale organization is an integral part of the evolution of such flows, and not a remnant of transitional behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857527
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Passive scalar tagging for the study of coherent structures in the plane mixing layer (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 2034-2041 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Data obtained from the two-dimensional numerical simulation of a plane mixing layer have been used to study the feasibility of tagging one side of the flow by a passive scalar and using the instantaneous concentration of the scalar to detect the typical coherent events in the flow. The study has shown that this technique works quite satisfactorily and yields results similar to those obtained by using the instantaneous vorticity as a detection criterion. The contribution from the coherent events to the time-averaged turbulent momentum and scalar transport has been estimated. It is found that this contribution is of the same order as the time-mean transport during most of the dynamical evolution of the coherent structure. However, it may attain very large values for short periods of time in the neighborhood of pairing. The increase is particularly spectacular in the case of the Reynolds shear stress. While the present findings obtained from a two-dimensional simulation seem to support earlier results obtained from actual experiments, it is desirable to conduct additional studies with three-dimensional simulations when they become available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857477
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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