The developing brownout cloud beneath a hovering microrotor is simulated using a hybrid free-vortex method–unsteady Reynolds-averaged Navier–Stokes solver coupled with a Lagrangian sediment-tracking algorithm. The present work attempts to examine the capabilities of a high-fidelity computational fluid dynamics analysis together with a sediment-tracking algorithm to analyze the evolution of brownout clouds. Both the single-phase and dual-phase flowfields are simulated and compared to available experimental data. The variation of the phenomenological attributes of the cloud evolution as a function of particle size was analyzed and found to agree with experimental evidence. To enable fast single-desktop simulations, all components of this methodology are designed to run on double-precision, programmable graphics processing units. This hybrid implementation uses a multigranular parallel approach to demonstrate significant performance gains over equivalent single-core central processing unit simulations even when computations involve the solution of sparse implicit systems.


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    Title :

    Modeling the Two-Phase Flowfield Beneath a Hovering Rotor on Graphics Processing Units


    Contributors:

    Published in:

    AIAA Journal ; 53 , 8 ; 2300-2320


    Publication date :

    2015-08-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English