An Investigation Into the Numerical Prediction of Boundary Layer Transition Using the K. Y. Chien Turbulence Model PDF Download
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722938598
Category :
Languages : en
Pages : 194
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Book Description
Assessments were made of the simulation capabilities of transition models developed at the University of Minnesota, as applied to the Launder-Sharma and Lam-Bremhorst two-equation turbulence models, and at The University of Texas at Austin, as applied to the K. Y. Chien two-equation turbulence model. A major shortcoming in the use of the basic K. Y. Chien turbulence model for low-Reynolds number flows was identified. The problem with the Chien model involved premature start of natural transition and a damped response as the simulation moved to fully turbulent flow at the end of transition. This is in contrast to the other two-equation turbulence models at comparable freestream turbulence conditions. The damping of the transition response of the Chien turbulence model leads to an inaccurate estimate of the start and end of transition for freestream turbulence levels greater than 1.0 percent and to difficulty in calculating proper model constants for the transition model. Stephens, Craig A. and Crawford, Michael E. Unspecified Center BOUNDARY LAYER TRANSITION; MATHEMATICAL MODELS; PREDICTIONS; TURBULENCE MODELS; TURBULENT FLOW; COMPUTERIZED SIMULATION; DAMPING; LOW REYNOLDS NUMBER; TURBINE BLADES...
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722938598
Category :
Languages : en
Pages : 194
Get Book Here
Book Description
Assessments were made of the simulation capabilities of transition models developed at the University of Minnesota, as applied to the Launder-Sharma and Lam-Bremhorst two-equation turbulence models, and at The University of Texas at Austin, as applied to the K. Y. Chien two-equation turbulence model. A major shortcoming in the use of the basic K. Y. Chien turbulence model for low-Reynolds number flows was identified. The problem with the Chien model involved premature start of natural transition and a damped response as the simulation moved to fully turbulent flow at the end of transition. This is in contrast to the other two-equation turbulence models at comparable freestream turbulence conditions. The damping of the transition response of the Chien turbulence model leads to an inaccurate estimate of the start and end of transition for freestream turbulence levels greater than 1.0 percent and to difficulty in calculating proper model constants for the transition model. Stephens, Craig A. and Crawford, Michael E. Unspecified Center BOUNDARY LAYER TRANSITION; MATHEMATICAL MODELS; PREDICTIONS; TURBULENCE MODELS; TURBULENT FLOW; COMPUTERIZED SIMULATION; DAMPING; LOW REYNOLDS NUMBER; TURBINE BLADES...
Author: O. Pironneau
Publisher: Cambridge University Press
ISBN: 9780521416184
Category : Mathematics
Languages : en
Pages : 536
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Book Description
The workshop concentrated on the following turbulence test cases: T1 Boundary layer in an S-shaped duct; T2 Periodic array of cylinders in a channel; T3 Transition in a boundary layer under the influence of free-stream turbulence; T4 & T5: Axisymmetric confined jet flows.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 264
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Author: M.Y. Hussaini
Publisher: Springer Science & Business Media
ISBN: 1461229561
Category : Science
Languages : en
Pages : 626
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Book Description
This volume contains the proceedings of the Workshop on In stability, Transition and Turbulence, sponsored by the Institute for Computer Applications in Science and Engineering (ICASE) and the NASA Langley Research Center (LaRC), during July 8 to August 2, 1991. This is the second workshop in the series on the subject. The first was held in 1989, and its proceedings were published by Springer-Verlag under the title "Instability and Transition" edited by M. Y. Hussaini and R. G. Voigt. The objectives of these work shops are to i) expose the academic community to current technologically im portant issues of transition and turbulence in shear flows over the entire speed range, ii) acquaint the academic community with the unique combination of theoretical, computational and experimental capabilities at LaRC and foster interaction with these capabilities, and iii) accelerate progress in elucidating the fundamental phenomena of transition and turbulence, leading to improved transition and turbulence modeling in design methodologies. The research areas covered in these proceedings include receptiv ity and roughness, nonlinear theories of transition, numerical simu lation of spatially evolving flows, modelling of transitional and fully turbulent flows as well as some experiments on instability and tran sition. In addition a one-day mini-symposium was held to discuss 1 recent and planned experiments on turbulent flow over a backward facing step.
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Author: Z. Yang
Publisher:
ISBN:
Category : Turbulence
Languages : en
Pages : 16
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Author: Frederick F. Simon
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 34
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Publisher:
ISBN:
Category :
Languages : en
Pages : 172
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Author: A. Hanifi
Publisher: Springer Science & Business Media
ISBN: 9401145156
Category : Science
Languages : en
Pages : 540
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Book Description
This single-volume work gives an introduction to the fields of transition, turbulence, and combustion modeling of compressible flows and provides the physical background for today’s modeling approaches in these fields. It presents basic equations and discusses fundamental aspects of hydrodynamical instability.
Author: Ralph John Volino
Publisher:
ISBN:
Category :
Languages : en
Pages : 492
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Author:
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ISBN:
Category :
Languages : en
Pages : 32
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