Sonic boom prediction around buildings has previously been conducted under the assumption of linear wave propagation. In this work, a more detailed analysis considering the nonlinear effect is achieved by means of computational fluid dynamics (CFD). The two-dimensional Euler equations are solved by employing a level set method for tracking a moving supersonic body, a ghost fluid method for applying the immersed boundary condition at the surface of the body, and an adaptive mesh refinement method. Simulations are made under the frame of reference of a flight object moving at Mach 1.6. Incident waves are composed of a single oblique shock wave, as well as N, flat-top, and ramp waves. The computational results clarify the complex flow behaviors around a building, involving the incident, reflected, and diffracted waves. At the bottom-front edge of a building, the waveform behind the shock waves is spiked, and the pressure rise is amplified due to double reflections. The diffracted waves are repeatedly reflected at the top corners of a building, resulting in amplification of the perceived level over a wide range. The results of this work demonstrate that CFD can provide more detailed information compared to previous approaches and can be deployed for practical applications.


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    Title :

    Numerical Simulation of Multiple Reflections and Diffractions of Sonic Boom Around Buildings


    Contributors:

    Published in:

    AIAA Journal ; 59 , 7 ; 2478-2489


    Publication date :

    2021-07-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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