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• W2947484224 abstract "Free AccessSecond Sonic Boom Prediction WorkshopIntroduction to the Special Section on Second AIAA Sonic Boom Prediction WorkshopMichael A. ParkMichael A. ParkNASA Langley Research Center, Hampton, Virginia 23681*Research Scientist, Computational AeroSciences Branch, 15 Langley Blvd. MS 128. Associate Fellow AIAA.Search for more papers by this authorPublished Online:31 May 2019https://doi.org/10.2514/1.C035323SectionsRead Now ToolsAdd to favoritesDownload citationTrack citations ShareShare onFacebookTwitterLinked InRedditEmail AboutDecades of sustained research in areas that support supersonic commercial transport technology have resulted in an increased interest in concept development and flight testing. The Second AIAA Sonic Boom Prediction Workshop (SBPW2) was held 8–9 January 2017 in conjunction with AIAA SciTech 2017 to examine the sonic boom simulation capabilities of the international community. The data and analysis methods of the workshop are intended to contribute toward the discussion of replacing the prohibition of overland supersonic flight with a certification standard. This special section provides summaries and statistical analysis of the submissions to the nearfield Computational Fluid Dynamics (CFD) and atmospheric propagation workshop test cases. Detailed method and submission descriptions from a number of the participants are also included in this special section.While the first Sonic Boom Workshop (SBPW1) [1] focused on nearfield sonic boom prediction, the SBPW2 included both nearfield prediction and atmospheric propagation test cases. The nearfield cases were based on three geometric models of increasing complexity: an axisymmetric body, a wing body, and a wing body with tail and flow-through nacelle. An optional wing body with tail and propulsion boundary conditions was also provided. These models were designed with similar nearfield signatures to isolate geometry and shock/expansion interaction effects. Eleven international participant groups submitted nearfield CFD signatures. Statistics and grid convergence of these nearfield signatures were compiled. These submissions were propagated to the ground, and noise levels were computed. Analysis of the noise levels allowed grid convergence and statistical distribution to be assessed.Significant progress was documented between SBPW2 and SBPW1, where the wing body with tail and flow-through nacelle case was quieter with similar or lower levels of variation. While significant progress was documented since the first workshop, the optional case with propulsion boundary conditions motivate the continuing need for development of methods that increase the reliability of sonic boom simulation.SBPW2 introduced atmospheric propagation test cases to compliment the evaluation of nearfield CFD methods. Nearfield pressure waveforms for two cases were supplied by the workshop committee and ground signatures at multiple azimuthal angles and their corresponding loudness metrics were supplied by ten participants from three countries. The propagation cases used temperature and pressure profiles from the US Standard atmosphere, coupled with two different humidity profiles. The propagation cases also included atmospheric profiles with measured data including winds. These profiles were selected using radiosonde balloon data at multiple geographically spread locations.The atmospheric propagation submissions confirm that the ground sonic boom waveforms, locations, and loudness values depend greatly on the atmospheric profile used in the prediction. Results with measured profiles differ significantly from those with a standard atmosphere profile, particularly at off-track locations. The measured atmospheric profiles produced larger variation in computed noise measures than the US Standard atmosphere profile. The impact of varying humidity profiles was small compared to varying wind or temperature profiles.In this special section, seven articles related to SBPW2 were published in Volume 56, Issue 3 of the Journal of Aircraft. Summaries and statistical analysis of the nearfield CFD [2] and atmospheric propagation [3] submission are provided. Detailed methods and submission descriptions are included for participants that used Cart3D [4], DLR-TAU [5], USM3D [6], Wolf [7], and Linearized Error Transport Equations [8].The SBPW2 participants and organizers would like to acknowledge the support of the AIAA staff and Applied Aerodynamics Technical Committee in organizing both Boom Prediction Workshops and Conference Special Sessions. The other AIAA workshops provided an invaluable source of support and guidance in organizing and documenting SBPW2. We hope that these workshops and this special section continue to foster continued discussion and research interest in eliminating technical barriers to practical commercial supersonic flight. References [1] Park M. A. and Morgenstern J. M., “Summary and Statistical Analysis of the First AIAA Sonic Boom Prediction Workshop,” Journal of Aircraft, Vol. 53, No. 2, 2016, pp. 578–598. doi:https://doi.org/10.2514/1.C033449 LinkGoogle Scholar[2] Park M. A. and Nemec M., “Near Field Summary and Statistical Analysis of the Second AIAA Sonic Boom Prediction Workshop,” Journal of Aircraft, Vol. 56, No. 3, 2019. doi:https://doi.org/10.2514/1.C034866 Google Scholar[3] Rallabhandi S. K. and Loubeau A., “Propagation Summary and Statistical Analysis of the Second AIAA Sonic Boom Prediction Workshop,” Journal of Aircraft, Vol. 56, No. 3, 2019. doi:https://doi.org/10.2514/1.C034805 LinkGoogle Scholar[4] Anderson G. R., Aftosmis M. J. and Nemec M., “Cart3D Simulations for the Second AIAA Sonic Boom Prediction Workshop,” Journal of Aircraft, Vol. 56, No. 3, 2019. doi:https://doi.org/10.2514/1.C034842 LinkGoogle Scholar[5] Kirz J. and Rudnik R., “DLR TAU Simulations for the Second AIAA Sonic Boom Prediction Workshop,” Journal of Aircraft, Vol. 56, No. 3, 2019. doi:https://doi.org/10.2514/1.C034819 LinkGoogle Scholar[6] Elmiligui A., Carter M. B., Nayani S., Cliff S. and Pearl J., “USM3D Simulations for 2nd Sonic Boom Workshop,” Journal of Aircraft, Vol. 56, No. 3, 2019. doi:https://doi.org/10.2514/1.C034831 LinkGoogle Scholar[7] Loseille A., Frazza L. and Alauzet F., “Comparing Anisotropic Adaptive Strategies on the 2nd AIAA Sonic Boom Workshop Geometry,” Journal of Aircraft, Vol. 56, No. 3, 2019. doi:https://doi.org/10.2514/1.C034840 LinkGoogle Scholar[8] Derlaga J. M., Park M. A. and Rallabhandi S. K., “Application of Exactly Linearlized Error Transport Equations to Sonic Boom Prediction Workshop,” Journal of Aircraft, Vol. 56, No. 3, 2019. doi:https://doi.org/10.2514/1.C034841 LinkGoogle Scholar Next article FiguresReferencesRelatedDetailsCited byIntroduction to the Special Section on the Third AIAA Sonic Boom Prediction WorkshopMichael A. Park and Elizabeth M. Lee-Rausch20 May 2022 | Journal of Aircraft, Vol. 59, No. 3 What's Popular Volume 56, Number 3May 2019Special Section on Second Sonic Boom Prediction Workshop CrossmarkInformationCopyright © 2018 by the American Institute of Aeronautics and Astronautics, Inc. The U.S. Government has a royalty-free license to exercise all rights under the copyright claimed herein for Governmental purposes. All other rights are reserved by the copyright owner. All requests for copying and permission to reprint should be submitted to CCC at www.copyright.com; employ the eISSN 1533-3868 to initiate your request. See also AIAA Rights and Permissions www.aiaa.org/randp. TopicsAerodynamicsAeronautical EngineeringAeronauticsAircraft Components and StructureAircraft DesignAircraft Design SoftwareAircraft Operations and TechnologyAircraftsCFD CodesComputational Fluid DynamicsFluid DynamicsShock Waves KeywordsSonic BoomsCFDStatistical DistributionsSupersonic FlightFlight TestingNacellesSupersonic Commercial TransportApplied AerodynamicsData AnalysisRadiosondesPDF Received29 October 2018Accepted29 October 2018Published online31 May 2019" @default.
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