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Author: Kwan-Liu Ma Publisher: ISBN: Category : Aeronautics Languages : en Pages : 20
Book Description
Abstract: "Air flowing around the wing tips of an airplane forms horizontal tornado-like vortices that can be dangerous to following aircraft. The dynamics of such vortices, including ground and atmospheric effects, can be predicted by numerical simulation, allowing the safety and capacity of airports to be improved. In this paper, we introduce three-dimensional techniques for visualizing time-dependent, two-dimensional wake vortex computations, and the hazard strength of such vortices near the ground. We describe a vortex core tracing algorithm and a local tiling method to visualize the vortex evolution. The tiling method converts time-dependent, two-dimensional vortex cores into three-dimensional vortex tubes. Finally, a novel approach calculates the induced rolling moment on the following airplane at each grid point within a region near the vortex tubes and thus allows three-dimensional visualization of the hazard strength of the vortices. We also suggest ways of combining multiple visualization methods to present more information simultaneously."
Author: Kwan-Liu Ma Publisher: ISBN: Category : Aeronautics Languages : en Pages : 20
Book Description
Abstract: "Air flowing around the wing tips of an airplane forms horizontal tornado-like vortices that can be dangerous to following aircraft. The dynamics of such vortices, including ground and atmospheric effects, can be predicted by numerical simulation, allowing the safety and capacity of airports to be improved. In this paper, we introduce three-dimensional techniques for visualizing time-dependent, two-dimensional wake vortex computations, and the hazard strength of such vortices near the ground. We describe a vortex core tracing algorithm and a local tiling method to visualize the vortex evolution. The tiling method converts time-dependent, two-dimensional vortex cores into three-dimensional vortex tubes. Finally, a novel approach calculates the induced rolling moment on the following airplane at each grid point within a region near the vortex tubes and thus allows three-dimensional visualization of the hazard strength of the vortices. We also suggest ways of combining multiple visualization methods to present more information simultaneously."
Author: National Research Council Publisher: National Academies Press ISBN: 0309113792 Category : Science Languages : en Pages : 102
Book Description
Without major changes, the current air transportation system will be unable to accommodate the expected increase in demand by 2025. One proposal to address this problem is to use the Global Positioning System to enable aircraft to fly more closely spaced. This approach, however, might be limited by the wake turbulence problem, which can be a safety hazard when smaller aircraft follow relatively larger aircraft too closely. To examine how this potential hazard might be reduced, Congress in 2005 directed NASA to request a study from the NRC to assess the federal wake turbulence R&D program. This book provides a description of the problem, an assessment of the organizational challenges to addressing wake turbulence, an analysis of the technical challenges in wake turbulence, and a proposal for a wake turbulence program plan. A series of recommendations for addressing the wake turbulence challenge are also given.
Author: Dan Bergeron Publisher: ISBN: Category : Computer graphics Languages : en Pages : 488
Book Description
The proceedings of Visualization 94, held in Washington, D.C., October 1994, comprise technical papers in the areas of volume visualization systems, applications, surfaces, visualization techniques, flow features and topology, visualizing geometry and algorithms, volume visualization techniques, user interfaces and techniques, flow visualization techniques, flow visualization systems, surface extraction, and visualization systems. Case studies are presented in the areas of magnetohydrodynamics and mathematics, environment, and medical applications. There are also six panels. Includes a 46-page section of color plates. No index. Annotation copyright by Book News, Inc., Portland, OR.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 700
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: J. P. Crowder Publisher: Begell House Publishers ISBN: 9781567000368 Category : Flow visualization Languages : en Pages : 1026
Book Description
Over 150 papers comprise this volume, covering a diversity of applications in every area. Included are recent developments in graphical display, imaging, image processing, numerical flow velocimetry, speckle photography, thermal transfer, and much more.
Author: Kwan-Liu Ma
Author: Kwan-Liu Ma
Author: National Research Council
Author: Dan Bergeron
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Author: United States. Superintendent of Documents
Author: Jose C. Renteria
Author: J. P. Crowder