Surface roughness can influence laminar-turbulent transition in many different ways. This paper outlines selected analyses performed at the NASA Langley Research Center, ranging in speed from subsonic to hypersonic Mach numbers and highlighting the beneficial as well as adverse roles of the surface roughness in technological applications. The first theme pertains to boundary-layer tripping on the forebody of a hypersonic airbreathing configuration via a spanwise periodic array of trip elements, with the goal of understanding the physical mechanisms underlying roughness-induced transition in a high-speed boundary layer. The effect of an isolated, finite amplitude roughness element on a supersonic boundary layer is considered next. The other set of flow configurations examined herein corresponds to roughness based laminar flow control in subsonic and supersonic swept wing boundary layers. A common theme to all of the above configurations is the need to apply higher fidelity, physics based techniques to develop reliable predictions of roughness effects on laminar-turbulent transition.


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    Title :

    On the Effects of Surface Roughness on Boundary Layer Transition


    Contributors:

    Conference:

    IISc Centenary International Conference and Exhibition on Aerospace Engineering (ICEAE2009) ; 2009 ; Bangalore, India


    Publication date :

    2009-05-18


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English


    Keywords :


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