[PDF] Documentation For Three Wake Vortex Model Data Sets From Simulation Of Flight 587 Wake Vortex Encounter Accident Case eBook

Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
Page : 32 pages
File Size : 39,57 MB
Release : 2019-01-18
Category : Science
ISBN : 9781794256132

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This document contains a general description for data sets of a wake vortex system in a turbulent environment. The turbulence and thermal stratification of the environment are representative of the conditions on November 12, 2001 near John F. Kennedy International Airport. The simulation assumes no ambient winds. The full three dimensional simulation of the wake vortex system from a Boeing 747 predicts vortex circulation levels at 80% of their initial value at the time of the proposed vortex encounter. The linked vortex oval orientation showed no twisting, and the oval elevations at the widest point were about 20 meters higher than where the vortex pair joined. Fred Proctor of NASA's Langley Research Center presented the results from this work at the NTSB public hearing that started 29 October 2002. This document contains a description of each data set including: variables, coordinate system, data format, and sample plots. Also included are instructions on how to read the data. Switzer, George F. Langley Research Center RTI/8438/006-02F

Author : Fred H. Proctor
Publisher : BiblioGov
Page : 64 pages
File Size : 50,41 MB
Release : 2013-07
Category :
ISBN : 9781289262389

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The atmospheric environment surrounding the crash of American Airlines Flight 587 is investigated. Examined are evidence for any unusual atmospheric conditions and the potential for encounters with aircraft wake vortices. Computer simulations are carried out with two different vortex prediction models and a Large Eddy Simulation model. Wind models are proposed for studying aircraft and pilot response to the wake vortex encounter.

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 60 pages
File Size : 17,96 MB
Release : 2018-06-03
Category :
ISBN : 9781720623632

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The atmospheric environment surrounding the crash of American Airlines Flight 587 is investigated. Examined are evidence for any unusual atmospheric conditions and the potential for encounters with aircraft wake vortices. Computer simulations are carried out with two different vortex prediction models and a Large Eddy Simulation model. Wind models are proposed for studying aircraft and pilot response to the wake vortex encounter.Proctor, Fred H. and Hamilton, David W. and Rutishauser, David K. and Switzer, George F.Langley Research CenterMETEOROLOGY; AIRLINE OPERATIONS; ACCIDENT INVESTIGATION; VORTICES; AIRCRAFT WAKES; CIVIL AVIATION; LARGE EDDY SIMULATION; TURBULENCE; STABILITY; CRASHES; AIRCRAFT PILOTS; AIRCRAFT SAFETY; VELOCITY DISTRIBUTION; WIND PROFILES; WEATHER

Author : A.S. Ginevsky
Publisher : Springer Science & Business Media
Page : 166 pages
File Size : 25,38 MB
Release : 2009-07-07
Category : Mathematics
ISBN : 3642017606

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Investigation of vortex wakes behind various aircraft, especially behind wide bodied and heavy cargo ones, is of both scientific and practical in terest. The vortex wakes shed from the wing’s trailing edge are long lived and attenuate only atdistances of10–12kmbehindthe wake generating aircraft. The encounter of other aircraft with the vortex wake of a heavy aircraft is open to catastrophic hazards. For example, air refueling is adangerous operationpartly due to thepossibility of the receiver aircraft’s encountering the trailing wake of the tanker aircraft. It is very important to know the behavior of vortex wakes of aircraft during theirtakeoff andlanding operations whenthe wakes canpropagate over the airport’s ground surface and be a serious hazard to other depart ing or arriving aircraft. This knowledge can help in enhancing safety of aircraft’s movements in the terminal areas of congested airports where the threat of vortex encounters limits passenger throughput. Theoreticalinvestigations of aircraft vortex wakes arebeingintensively performedinthe major aviationnations.Usedforthispurpose are various methods for mathematical modeling of turbulent flows: direct numerical simulation based on the Navier–Stokes equations, large eddy simulation using the Navier–Stokes equations in combination with subrigid scale modeling, simulation based on the Reynolds equations closed with a differential turbulence model. These approaches are widely used in works of Russian and other countries’ scientists. It should be emphasized that the experiments in wind tunnels and studies of natural vortex wakes behind heavy and light aircraft in flight experiments are equally important.

Author : Daniel Guy Schauerhamer
Publisher :
Page : pages
File Size : 29,91 MB
Release : 2017
Category :
ISBN : 9780355763850

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To better understand aircraft wake behavior with the goal to increase flight safety and airport capacity, the aircraft wake vortex lifecycle was simulated using computational fluid dynamics. Using a build-up approach, best practices for wing-tip vortex roll-up were developed starting with a simple inviscid vortex, and building up in complexity to a finite wing and full aircraft. Validation of the best practices was accomplished with comparisons to wind tunnel data. Best practices were then applied to the German Aerospace Center F11 wind tunnel model and the NASA Common Research Model with validation of results with wind tunnel measurements. Vortex sensitivity to aircraft configuration were explored by changing the details of the F11 model, and by adding a generic winglet to the Common Research Model. Results demonstrated that the wake vortex changed significantly with aircraft configuration. The wake of the Common Research Model was used to initialize two-dimensional evolution studies which propagated the wake system to 10 wing spans downstream. Best practices were developed to demonstrate low numerical error and the computational savings of using adaptive mesh refinement. Three-dimensional simulations were carried out with the Common Research Model to resolve 10 wing spans downstream, however with a coarser-than-desired mesh due to computational limitations. The solution was used to initialize three-dimensional decay simulations. A testbed case of wake vortex decay was used to develop best practices and quantify error sources for decay simulations in a cost-effective manner. Those best practices were applied to the Common Research Model decay simulation. Results throughout the research were compared to idealized vortex models that in practice are used to initialize decay simulations. For all comparisons, including the aircraft effects resulted with significant differences to the idealized vortex models. Including the aircraft effects in the simulations resulted in more accurate wake results.

Author : Federal Aviation Administration
Publisher : CreateSpace
Page : 66 pages
File Size : 23,18 MB
Release : 1995-04-15
Category : Education
ISBN : 9781493768523

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DOT/FAA/RD-95/6 DOT-VNTSC-FAA-95-4 Federal Aviation Administration, Final Report, April 1995 Airframe manufacturers, aircraft associations, airlines, pilot groups, air traffic controllers, government and regulatory agencies, and other organizations and individuals have developed this training resource dedicated to reducing the number of wake-turbulence accidents and incidents. The training package consists primarily of this document. Additionally, a companion video developed by the Wake Turbulence Training Aid Industry Team is also available. Wake-turbulence accidents and incidents have been, and continue to be, a significant contributor to the worldwide safety statistics. The National Transportation Safety Board (NTSB), in a report on safety issues related to wake-vortex encounters, stated that data shows that between 1983 and 1993, there were at least 51 accidents and incidents in the United States that resulted from probable encounters with wake vortices. As a result of these encounters, 27 occupants were killed, eight were seriously injured, and 40 aircraft were substantially damaged or destroyed. In this report, the NTSB raised concern over "the adequacy of air traffic control procedures" and "pilot knowledge related to the avoidance of wake vortices."

Author : Linda J. Connell
Publisher : BiblioGov
Page : 38 pages
File Size : 15,98 MB
Release : 2013-06
Category :
ISBN : 9781289114497

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ASRS is conducting a structured callback research project of wake vortex incidents reported to the ASRS at all US airports, as well as wake encounters in the enroute environment. This study has three objectives: (1) Utilize the established ASRS supplemental data collection methodology and provide ongoing analysis of wake vortex encounter reports; (2) Document event dynamics and contributing factors underlying wake vortex encounter events; and (3) Support ongoing FAA efforts to address pre-emptive wake vortex risk reduction by utilizing ASRS reporting contributions.