Comparative Study of Coherent Vortex Structures in a Boundary Layer with Adverse Pressure Gradient by Means of a New Experimental Method PDF Download
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Languages : en
Pages : 0
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There are several kinds of coherent structures found in previous investigations in a transitional Blasius boundary layer. Spikes, A-vortices, 3D high-shear layers, and ring-like vortices are among them. These structures were observed in experimental and numerical (DNS) investigations. Very similar flow pattens were also found in other transitional near-wall shear flows, such as the plane channel flow and the pipe flow, and also in the developed wall turbulence. Based on these observations, it was suggested that these structures are very universal and represent an inherent feature of the process of turbulence production in all near-wall flows in both transitional and turbulent regimes. Moreover, the mechanism of formation and interaction of these structures can be regarded as a universal mechanism of turbulence production. The main goal of the present study is to check this idea for the case of the APG boundary-layer transition, whose late stages have never been studied experimental despite the great practical importance of this case. The only currently available study was performed numerically for a rather large APG (which is difficult to examine in the wind tunnel).
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Languages : en
Pages : 0
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There are several kinds of coherent structures found in previous investigations in a transitional Blasius boundary layer. Spikes, A-vortices, 3D high-shear layers, and ring-like vortices are among them. These structures were observed in experimental and numerical (DNS) investigations. Very similar flow pattens were also found in other transitional near-wall shear flows, such as the plane channel flow and the pipe flow, and also in the developed wall turbulence. Based on these observations, it was suggested that these structures are very universal and represent an inherent feature of the process of turbulence production in all near-wall flows in both transitional and turbulent regimes. Moreover, the mechanism of formation and interaction of these structures can be regarded as a universal mechanism of turbulence production. The main goal of the present study is to check this idea for the case of the APG boundary-layer transition, whose late stages have never been studied experimental despite the great practical importance of this case. The only currently available study was performed numerically for a rather large APG (which is difficult to examine in the wind tunnel).
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Category : Aeronautics
Languages : en
Pages : 652
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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: Victor Zakkay
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Category : Turbulent boundary layer
Languages : en
Pages : 52
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Author: D. E. Abbott
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Category :
Languages : en
Pages : 17
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This project combines both experimental video flow visualization studies and theoretical investigations of a series of phenomenological and theoretical models based upon the three-dimensional details of convected, coherent structural elements of a turbulent flow as it interacts with a solid surface. The progress over the past year has led to the experimental consideration of range of sub-problems including high Reynolds Number (4,000,000) turbulent flows, the effect of surface modification on low-speed streak formation, and the effect of vortex loop interaction with a solid boundary. To augment the visualization pictures, a computerized video-digitizing system has been developed. Preliminary results show tremendous promise for obtaining quantitative data from flow visualization pictures. The specific thrust of the theoretical studies has been focussed on three areas: (1) how two- and three-dimensional vortex structures interact with wall boundary layers, (2) the development of a new type of prediction method for two-dimensional turbulent boundary-layer flows, and (3) improvement in numerical techniques for solving parabolic, boundary-layer equations. (Author).
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Category : Mechanics, Applied
Languages : en
Pages : 400
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Category :
Languages : en
Pages : 52
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Category : Aeronautics
Languages : en
Pages : 1012
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Author: O. Sendstad
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Category : Simulation methods
Languages : en
Pages : 130
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Category : Government reports announcements & index
Languages : en
Pages : 1372
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Author: F.T. Nieuwstadt
Publisher: Springer Science & Business Media
ISBN: 940111689X
Category : Technology & Engineering
Languages : en
Pages : 532
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Book Description
The European Turbulence Conferences have been organized under the auspices of the European Mechanics Committee (Euromech) to provide a forum for discussion and exchange of recent and new results in the field of turbulence. The first conference was organized in Lyon in 1986 with 152 participants. The second and third conferences were held in Berlin (1988) and Stockholm (1990) with 165 and 172 participants respectively. The fourth was organized in Delft from 30 June to 3 July 1992 by the J.M. Burgers Centre. There were 214 participants from 22 countries. This steadily growing number of participants demonstrates both the success and need for this type of conference. The main topics of the Fourth European Turbulence Conference were: Dynamical Systems and Transition; Statistical Physics and Turbulence; Experiments and Novel Experimental Techniques; Particles and Bubbles in Turbulence; Simulation Methods; Coherent Structures; Turbulence Modelling and Compressibility Effects. In addition a special session was held on the subject of CeBular Automata. Each of the sessions was introduced with a survey lecture. The lecturers were: W. Eckhaus, AJ. Libchaber, L. Katgerman, F. Durst, M. Lesieur, B. Legras, D.G. Dritschel and P. Bradshaw. The contributions of the participants were subdivided into oral and poster presentations. In addition to the normal program, some Speciai Interest Groups of Ercoftac (European Research Community on Flow, Turbulence and Combustion) presented their research activities in the form of a poster.
