A method for determination of turbulent skin friction when the coefficients of log-law may differ from universal constants

Krishnan, V and Yajnik, KS (1988) A method for determination of turbulent skin friction when the coefficients of log-law may differ from universal constants. Technical Report. National Aeronautical Laboratory, Bangalore,India.

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    Abstract

    A simple method is proposed for the determination of skin friction from the measured two-dimensional turbulent boundary layer mean.velocity profile,(a) the log-law to the overlap region or (b) the equation of Coles to a large portion of tihe velocity profile by an iterative proceuure, The distinguishing fedcure of Lhe rnethc-1 is that the coefficients of tile 1ogarithmic part of the mean velocity may not have to be luiown apriori.Consequently, the can take values other than those vcilucs of universal log-law. Comparison with experimental data of flow cownstream of flat plate turbulence manipulators (ribbons) and for interaction of airfoil wake with boundary layer, suggests that the method sives results cmparable13; with taose obtained by balance and fence.13;

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Skin friction;Log-law coefficients;Turbulent boundary layer.
    Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
    Division/Department: Flight Mechanics and Control Division, Flight Mechanics and Control Division
    Depositing User: M/S ICAST NAL
    Date Deposited: 03 Oct 2006
    Last Modified: 24 May 2010 09:51
    URI: http://nal-ir.nal.res.in/id/eprint/2825

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