It has been shown in recent times that transition to turbulence occurs following two- and three-dimensional routes primarily by what is called the spatiotemporal wave front, for the canonical problem of a zero-pressure gradient boundary layer excited harmonically at the wall following an impulsive start. This paper shows that this onset process of disturbance growth continues also for a varying range of nonimpulsive wall excitation onset that is switched on smoothly. This is important because this will dispel any idea that a spatiotemporal wave front is totally due to impulsive start of wall excitation. This paper distinguishes between high- and low-frequency excitation cases to follow qualitatively different transition routes.


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    Title :

    Receptivity to Harmonic Excitation Following Nonimpulsive Start for Boundary-Layer Flows


    Contributors:

    Published in:

    AIAA Journal ; 55 , 10 ; 3233-3238


    Publication date :

    2017-10-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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