The development, validation, and introduction of physics-based approaches for stability and transition prediction will lead to smaller and more manageable uncertainties in the design of hypersonic vehicles. Through mechanism identification, verification, and validation activities for two- and three-dimensional geometries, the following have been learned in applying stability formulations: 1) Related to verification of the basic state, the acid test is to refine the basic state until the stability results do not change; 2) A good verification test for the stability formulation is to be sure the linear problem is correctly modeled; 3) In validation, it is very important to work on the same geometries computationally and experimentally and confirm them; for example, model alignment and freestream flow angularity are found to be important; 4) From verification studies on three-dimensional geometries, numerical errors, especially near the windward plane, can seed the stationary crossflow instability in the supposedly undisturbed basic state; the stationary crossflow instability is sensitive; 5) The marching path is important for three-dimensional geometries and should be in the group-velocity direction; the N factor has some uncertainty in it, and caution should be used in quoting it with precision; and 6) Nonlinear effects should be included in detailed studies of crossflow instability necessitating a nonlinear parabolized stability equation or direct numerical simulation approach. Presented as Paper 2013-2556 at the 21st AIAA Computational Fluid Dynamics Conference, San Diego, CA, 24-27 June 2013


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    Title :

    Verification and Validation Issues in Hypersonic Stability and Transition Prediction




    Publication date :

    2015




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    55.60 Raumfahrttechnik
    Local classification TIB:    770/7040



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