The Effects Of Streamline Curvature And Swirl On Turbulent Flows In Curved Ducts
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The Effects Of Streamline Curvature And Swirl On Turbulent Flows In Curved Ducts
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-23
The Effects Of Streamline Curvature And Swirl On Turbulent Flows In Curved Ducts written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-23 with categories.
A technique for improving the numerical predictions of turbulent flows with the effect of streamline curvature is developed. Separated flows, the flow in a curved duct, and swirling flows are examples of flow fields where streamline curvature plays a dominant role. A comprehensive literature review on the effect of streamline curvature was conducted. New algebraic formulations for the eddy viscosity incorporating the kappa-epsilon turbulence model are proposed to account for various effects of streamline curvature. The loci of flow reversal of the separated flows over various backward-facing steps are employed to test the capability of the proposed turbulence model in capturing the effect of local curvature. The inclusion of the effect of longitudinal curvature in the proposed turbulence model is validated by predicting the distributions of the static pressure coefficients in an S-bend duct and in 180 degree turn-around ducts. The proposed turbulence model embedded with transverse curvature modification is substantiated by predicting the decay of the axial velocities in the confined swirling flows. The numerical predictions of different curvature effects by the proposed turbulence models are also reported. Cheng, Chih-Hsiung and Farokhi, Saeed Unspecified Center DUCTED FLOW; EDDY VISCOSITY; FLOW DISTRIBUTION; K-EPSILON TURBULENCE MODEL; MATHEMATICAL MODELS; SEPARATED FLOW; TURBULENT FLOW; BACKWARD FACING STEPS; COMPUTATIONAL FLUID DYNAMICS; CURVATURE; SWIRLING...
The Effects Of Streamline Curvature And Swirl On Turbulent Flows In Curved Ducts
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Author : Chih-Hsiung Gary Cheng
language : en
Publisher:
Release Date : 1991
The Effects Of Streamline Curvature And Swirl On Turbulent Flows In Curved Ducts written by Chih-Hsiung Gary Cheng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Effects Of Streamline Curvature On Turbulent Flow
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Author : Peter Bradshaw
language : en
Publisher:
Release Date : 1973
Effects Of Streamline Curvature On Turbulent Flow written by Peter Bradshaw and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Boundary layer categories.
Streamline curvature in the plane of the mean shear produces large changes in the turbulence structure of shear layers, usually an order of magnitude more important than normal pressure gradients and other terms in the mean-motion equations for curved flows. The effects on momentum and heat transfer in boundary layers are noticeable on typical wing sections and are very important on highly-cambered turbomachine blades: turbulence may be nearly eliminated on highly-convex surfaces, while on highly-concave surfaces momentum transfer by quasi-steady longitudinal vortices dominates the ordinary turbulence processes. The greatly enhanced mixing rates of swirling jets and the characteristic non-turbulent cores of trailing vortices are also consequences of the effects of streamline curvature on the turbulence structure. A progress report, comprises a review of current knowledge, a discussion of methods of predicting curvature effects, and a presentation of principles for the guidance of future workers.
Computation Of Laminar And Turbulent Flow In Curved Ducts Channels And Pipes Using The Navier Stokes Equations
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Author : R. C. Buggeln
language : en
Publisher:
Release Date : 1980
Computation Of Laminar And Turbulent Flow In Curved Ducts Channels And Pipes Using The Navier Stokes Equations written by R. C. Buggeln and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Laminar flow categories.
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).
Effects Of Streamline Curvature On Turbulent Flow
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Author :
language : en
Publisher:
Release Date : 1973*
Effects Of Streamline Curvature On Turbulent Flow written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973* with categories.
Flow In Curved Ducts Of Varying Cross Section
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Author : Fotis Sotiropoulos
language : en
Publisher:
Release Date : 1992
Flow In Curved Ducts Of Varying Cross Section written by Fotis Sotiropoulos and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Laminar flow categories.
Numerical Study Of Turbulent Secondary Flows In Curved Ducts
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Author : Institute for Computer Applications in Science and Engineering
language : en
Publisher:
Release Date : 1989
Numerical Study Of Turbulent Secondary Flows In Curved Ducts written by Institute for Computer Applications in Science and Engineering and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.
Monthly Catalog Of United States Government Publications
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Author :
language : en
Publisher:
Release Date :
Monthly Catalog Of United States Government Publications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Government publications categories.
Turbulent Flow Field Predictions In Sharply Curved Turn Around Ducts
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Author : L. Michael Santi
language : en
Publisher:
Release Date : 1986
Turbulent Flow Field Predictions In Sharply Curved Turn Around Ducts written by L. Michael Santi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Fluid dynamics categories.
