Propagation Summary of the Second AIAA Sonic Boom Prediction Workshop

Rallabhandi, Sriram K.; Loubeau, Alexandra

doi:10.2514/6.2017-3257

Cited by 15 publications

(7 citation statements)

References 3 publications

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“…The first day of SBPW2 focused on analysis of the nearfield pressure field and is covered here. The second day focused on propagation as detailed by Rallabhandi and Loubeau [2]. There were approximately 50 attendees.…”

Section: Introductionmentioning

confidence: 99%

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Nearfield Summary and Statistical Analysis of the Second AIAA Sonic Boom Prediction Workshop

Park

Nemec

2019

Journal of Aircraft

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A summary is provided for the Second AIAA Sonic Boom Workshop held 8-9 January 2017 in conjunction with AIAA SciTech 2017. The workshop used three required models of increasing complexity: an axisymmetric body, a wing body, and a complete configuration with flow-through nacelle. An optional complete configuration with propulsion boundary conditions is also provided. These models are designed with similar nearfield signatures to isolate geometry and shock/expansion interaction effects. Eleven international participant groups submitted nearfield signatures with forces, pitching moment, and iterative convergence norms. Statistics and grid convergence of these nearfield signatures are presented. These submissions are propagated to the ground, and noise levels are computed. This allows the grid convergence and the statistical distribution of a noise level to be computed. While progress is documented since the first workshop, improvement to the analysis methods for a possible subsequent workshop are provided. The complete configuration with flow-through nacelle showed the most dramatic improvement between the two workshops. The current workshop cases are more relevant to vehicles with lower loudness and have the potential for lower annoyance than the first workshop cases. The models for this workshop with quieter ground noise levels than the first workshop exposed weaknesses in analysis, particularly in convective discretization. * Research Scientist, Computational AeroSciences Branch, Mike.Park@NASA.gov, AIAA Senior Member. † Aerospace Engineer, Computational Aerosciences Branch, Marian.Nemec@NASA.gov, AIAA Senior Member.

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Section: Introductionmentioning

confidence: 99%

“…This includes all the participant presentations, computational grids, and submitted results to encourage continued research. Workshop participants also published details of their analysis in conference papers organized into an invited special session at the AIAA AVIAITON 2017 conference with this summary [2,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Nearfield Summary and Statistical Analysis of the Second AIAA Sonic Boom Prediction Workshop

Park

Nemec

2019

Journal of Aircraft

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“…The deterministic profiles are shown in Figure 5. The atmospheric profiles were adopted from the second sonic boom prediction workshop 44 for a case from Green Bay, WI during the winter of 2013. The convention for wind direction for this application is wind in the (positive) X-direction is a tailwind and wind in the Y-direction is cross wind.…”

Section: Sources Of Uncertaintymentioning

confidence: 99%

Multifidelity Uncertainty Quantification of a Commercial Supersonic Transport

West

Phillips

2018

2018 Applied Aerodynamics Conference

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The objective of this work was to develop a multifidelity uncertainty quantification approach for efficient analysis of a commercial supersonic transport. An approach based on non-intrusive polynomial chaos was formulated in which a low-fidelity model could be corrected by any number of high-fidelity models. The formulation and methodology also allows for the addition of uncertainty sources not present in the lower fidelity models. To demonstrate the applicability of the multifidelity polynomial chaos approach, two model problems were explored. The first was supersonic airfoil with three levels of modeling fidelity, each capturing an additional level of physics. The second problem was a commercial supersonic transport. This model had three levels of fidelity that included two different modeling approaches and the addition of physics between the fidelity levels. Both problems illustrate the applicability and significant computational savings of the multifidelity polynomial chaos method.

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“…The primary intent of these meshes is to drastically reduce solver diffusion when predicting the shock waves propagation. The performance of this approach in near-field (aircraft-cylinder) has been studied in [6] and the resulting propagation in [7]. In addition, the level of anisotropy along the Mach cone and the density of the mesh in the azimuthal direction is controlled.…”

Section: Introductionmentioning

confidence: 99%

Comparing anisotropic adaptive strategies on the 2nd AIAA sonic boom workshop geometry

Loseille

Frazza

Alauzet

2017

55th AIAA Aerospace Sciences Meeting

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The recent release of the 2nd AIAA sonic boom geometry offers the opportunity to review the classical anisotropic adaptive strategies for complex geometries. The design of Mach-aligned tailored grids is also a great challenge to see how adaptivity can compete with user-defined tailored grids. Two classical adaptive strategies, multi-scale and goal-oriented, are compared with the results obtained on tailored grids. For the flow solver, we discuss several low-dissipation numerical schemes of order 4th and 6th with respect to regular 2nd order scheme both on inviscid and RANS flow conditions. We finally perform a non-linear error analysis to assess the convergence of the sequence of adaptive meshes with respect to tailored grids. All results and discussions are based on the C25D baseline geometry.

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Propagation Summary of the Second AIAA Sonic Boom Prediction Workshop

Cited by 15 publications

References 3 publications

Nearfield Summary and Statistical Analysis of the Second AIAA Sonic Boom Prediction Workshop

Nearfield Summary and Statistical Analysis of the Second AIAA Sonic Boom Prediction Workshop

Multifidelity Uncertainty Quantification of a Commercial Supersonic Transport

Comparing anisotropic adaptive strategies on the 2nd AIAA sonic boom workshop geometry

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