Abstract In this paper, we test the local isotropy of higher order statistics in the intermediate wake region. We focus on normalized odd moments of the transverse velocity derivatives, M 2 n + 1 ( u / z ) = ( u / z ) 2 n + 1 ¯ / ( u / z ) 2 ¯ ( 2 n + 1 ) / 2 on the wake centreline, which should be zero if local isotropy is satisfied (n is a positive integer). It is found that the relation M 2 n + 1 ( u / z ) R λ - 1 is supported reasonably well by hot-wire data up to the seventh-order ( n = 3 ), although it is also dependent on the initial conditions. In particular, the present data show that the higher the order (e.g. fifth- or seventh-order), the higher R λ must be for local isotropy to be satisfied (i.e. M 2 n + 1 ( u / z ) = 0 ).


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    Title :

    Towards Local Isotropy of Higher Order Statistics in Wakes


    Contributors:


    Publication date :

    2016-01-01


    Size :

    6 pages





    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




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