NWRA AVOSS Wake Vortex Prediction Algorithm Version 3.1.1

The Northwest Research Associates Aircraft Vortex Spacing System Prediction Algorithm computes trailing vortex trajectories and circulation decay in a plane perpendicular to the path of the aircraft that has generated the vortices. Underlying the algorithm are the following assumptions: initial vort...

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Bibliographic Details
Published inTech Briefs Vol. 42; no. 3; p. 45
Format Trade Publication Article
LanguageEnglish
Published New York SAE Media Group 01.03.2018
Subjects
Aerodynamics
Aircraft
Algorithms
Crosswinds
Decay rate
Ordinary differential equations
R&D
Research & development
Trailing vortices
Vortices
Vorticity
Wind effects
Virginia
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ISSN3068-2053
3068-207X

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Summary:The Northwest Research Associates Aircraft Vortex Spacing System Prediction Algorithm computes trailing vortex trajectories and circulation decay in a plane perpendicular to the path of the aircraft that has generated the vortices. Underlying the algorithm are the following assumptions: initial vortex conditions assume that all trailing vorticity due to lift is rolled up into a vortex pair; away from the ground, the vortices are transported laterally at the speed of the local crosswind, and transport due to large-scale turbulence is not included; crosswind shear effects are not included, except as might arise from the previous assumption; and the circulation decay rate for each member of the vortex pair is the same. For the purpose of the algorithm, the vortices are considered to evolve through four distinct phases.
ISSN:3068-2053
3068-207X