Measurement and Calculation of Developing Turbulent Flow in a U-bend and Downstream Tangent of Square Cross-section PDF Download
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Author: Shengming Chang
Publisher:
ISBN:
Category :
Languages : en
Pages : 332
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Book Description
Author: Shengming Chang
Publisher:
ISBN:
Category :
Languages : en
Pages : 332
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 43
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Book Description
A review is provided of the second year of research pertaining to the experimental measurement and numerical prediction of curved duct flows. Experimental measurements obtained using a laser-Doppler velocimeter, recent turbulence model developments and numerical calculations are presented and discussed. The current state of the research program is revised together with a work plan for year three of research. (Author).
Author: Shengming Chang
Publisher:
ISBN:
Category : Turbulence
Languages : en
Pages : 300
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1282
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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. A. C. Humphrey
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
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Book Description
A detailed account is given of the experimental and numerical modeling activities for the research period, relating to turbulent flow in a 180 deg curved duct. The measurements show variations in the flow field which, while understood, are not predictable by a K-epsilon model of turbulence. Numerical diffusion and exaggerated physical diffusion in the turbulence model are believed to be the major causes for the discrepancies observed. The new experimental data offered here should be of value for extending the theoretical base for the improved understanding and modeling of 3-D turbulent flows. Recommendations are made for continuing work.
Author: James Henry Azzola
Publisher:
ISBN:
Category :
Languages : en
Pages : 128
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 526
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Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 540
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Book Description
Author: Joseph A. Humphrey
Publisher:
ISBN:
Category :
Languages : en
Pages : 76
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Book Description
A summary is provided of the achievements and recommendations related to this research program. Reference is made to the extensive documentation already published. The appendix to this report contains recent experimental results obtained in a 180 deg curved pipe of circular cross-section. The results differ significantly from corresponding measurements in curved ducts.
Author: R. C. Buggeln
Publisher:
ISBN:
Category : Laminar flow
Languages : en
Pages : 84
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Book Description
Both laminar and turbulent flows in strongly curved ducts, channels, and pipes are studied by numerical methods. The study concentrates on the curved square-duct geometry and flow conditions for which detailed measurements have been obtained recently by Taylor, Whitelaw, and Yianneskis. The solution methodology encompasses solution of the compressible ensemble-averaged Navier-Stokes equations at low Mach number using a split linearized block implicit (LBI) scheme, and rapid convergence on the order of 80 noniterative time steps is obtained. The treatment of turbulent flows includes resolution of the viscous sublayer region. A series of solutions for both laminar and turbulent flow and for both two- and three-dimensional geometries of the same curvature are presented. The accuracy of these solutions is explored by mesh refinement and by comparison with experiment. In summary, good qualitative and reasonable quantitative agreement between solution and experiment is obtained. Collectively, this sequence of results serves to clarify the physical structure of these flows and hence how grid selection procedures might be adjusted to improve the numerical accuracy and experimental agreement. For a three-dimensional flow of considerable complexity, the relatively good agreement with experiment obtained for the turbulent flow case despite a coarse grid must be regarded as encouraging. (Author).
