A New Time Scale Based K E Model For Near Wall Turbulence
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A New Time Scale Based K Epsilon Model For Near Wall Turbulence
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-06-28
A New Time Scale Based K Epsilon Model For Near Wall Turbulence 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 2018-06-28 with categories.
A k-epsilon model is proposed for wall bonded turbulent flows. In this model, the eddy viscosity is characterized by a turbulent velocity scale and a turbulent time scale. The time scale is bounded from below by the Kolmogorov time scale. The dissipation equation is reformulated using this time scale and no singularity exists at the wall. The damping function used in the eddy viscosity is chosen to be a function of R(sub y) = (k(sup 1/2)y)/v instead of y(+). Hence, the model could be used for flows with separation. The model constants used are the same as in the high Reynolds number standard k-epsilon model. Thus, the proposed model will be also suitable for flows far from the wall. Turbulent channel flows at different Reynolds numbers and turbulent boundary layer flows with and without pressure gradient are calculated. Results show that the model predictions are in good agreement with direct numerical simulation and experimental data. Yang, Z. and Shih, T. H. Glenn Research Center NASA ORDER C-99066-6; RTOP 505-62-21...
A New Time Scale Based K Epsilon Model For Near Wall Turbulence
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Author : National Aeronautics and Space Administration NASA
language : en
Publisher:
Release Date : 2018-10-23
A New Time Scale Based K Epsilon Model For Near Wall Turbulence written by National Aeronautics and Space Administration NASA and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-23 with categories.
A k-epsilon model is proposed for wall bonded turbulent flows. In this model, the eddy viscosity is characterized by a turbulent velocity scale and a turbulent time scale. The time scale is bounded from below by the Kolmogorov time scale. The dissipation equation is reformulated using this time scale and no singularity exists at the wall. The damping function used in the eddy viscosity is chosen to be a function of R(sub y) = (k(sup 1/2)y)/v instead of y(+). Hence, the model could be used for flows with separation. The model constants used are the same as in the high Reynolds number standard k-epsilon model. Thus, the proposed model will be also suitable for flows far from the wall. Turbulent channel flows at different Reynolds numbers and turbulent boundary layer flows with and without pressure gradient are calculated. Results show that the model predictions are in good agreement with direct numerical simulation and experimental data. Yang, Z. and Shih, T. H. Glenn Research Center NASA ORDER C-99066-6; RTOP 505-62-21...
A New Time Scale Based K E Model For Near Wall Turbulence
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Author : Z. Yang
language : en
Publisher:
Release Date : 1992
A New Time Scale Based K E Model For Near Wall Turbulence written by Z. Yang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Turbulence categories.
A Critical Evaluation Of Two Equation Models For Near Wall Turbulence
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-06-27
A Critical Evaluation Of Two Equation Models For Near Wall Turbulence 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 2018-06-27 with categories.
A variety of two-equation turbulence models, including several versions of the K-epsilon model as well as the K-omega model, are analyzed critically for near wall turbulent flows from a theoretical and computational standpoint. It is shown that the K-epsilon model has two major problems associated with it: the lack of natural boundary conditions for the dissipation rate and the appearance of higher-order correlations in the balance of terms for the dissipation rate at the wall. In so far as the former problem is concerned, either physically inconsistent boundary conditions have been used or the boundary conditions for the dissipation rate have been tied to higher-order derivatives of the turbulent kinetic energy which leads to numerical stiffness. The K-omega model can alleviate these problems since the asymptotic behavior of omega is known in more detail and since its near wall balance involves only exact viscous terms. However, the modeled form of the omega equation that is used in the literature is incomplete-an exact viscous term is missing which causes the model to behave in an asymptotically inconsistent manner. By including this viscous term and by introducing new wall damping functions with improved asymptotic behavior, a new K-tau model (where tau is identical with 1/omega is turbulent time scale) is developed. It is demonstrated that this new model is computationally robust and yields improved predictions for turbulent boundary layers. Speziale, Charles G. and Abid, Ridha and Anderson, E. Clay Langley Research Center NAS1-18605..
A Galilean And Tensorial Invariant K E Model For Near Wall Turbulence
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Author : Z. Yang
language : en
Publisher:
Release Date : 1993
A Galilean And Tensorial Invariant K E Model For Near Wall Turbulence written by Z. Yang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Turbulence categories.
An Improved K Epsilon Model For Near Wall Turbulence And Comparison With Direct Numerical Simulation
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Author : T. H. Shih
language : en
Publisher:
Release Date : 1990
An Improved K Epsilon Model For Near Wall Turbulence And Comparison With Direct Numerical Simulation written by T. H. Shih and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Fluid dynamics categories.
Calculation Of Reattaching Shear Layers In Divergent Channel With A Multiple Time Scale Turbulence Model
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Author : S.-W. Kim
language : en
Publisher:
Release Date : 1989
Calculation Of Reattaching Shear Layers In Divergent Channel With A Multiple Time Scale Turbulence Model written by S.-W. Kim 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.
A Near Wall Turbulence Model And Its Application To Fully Developed Turbulent Channel And Pipe Flows
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-06-28
A Near Wall Turbulence Model And Its Application To Fully Developed Turbulent Channel And Pipe Flows 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 2018-06-28 with categories.
A near wall turbulence model and its incorporation into a multiple-time-scale turbulence model are presented. In the method, the conservation of mass, momentum, and the turbulent kinetic energy equations are integrated up to the wall; and the energy transfer rate and the dissipation rate inside the near wall layer are obtained from algebraic equations. The algebraic equations for the energy transfer rate and the dissipation rate inside the near wall layer were obtained from a k-equation turbulence model and the near wall analysis. A fully developed turbulent channel flow and fully developed turbulent pipe flows were solved using a finite element method to test the predictive capability of the turbulence model. The computational results compared favorably with experimental data. It is also shown that the present turbulence model could resolve the over shoot phenomena of the turbulent kinetic energy and the dissipation rate in the region very close to the wall. Kim, S.-W. Glenn Research Center NASA ORDER C-99066-G; RTOP 505-62-20...
Turbulent Flows
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Author : G. Biswas
language : en
Publisher: CRC Press
Release Date : 2002
Turbulent Flows written by G. Biswas and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Technology & Engineering categories.
This book allows readers to tackle the challenges of turbulent flow problems with confidence. It covers the fundamentals of turbulence, various modeling approaches, and experimental studies. The fundamentals section includes isotropic turbulence and anistropic turbulence, turbulent flow dynamics, free shear layers, turbulent boundary layers and plumes. The modeling section focuses on topics such as eddy viscosity models, standard K-E Models, Direct Numerical Stimulation, Large Eddy Simulation, and their applications. The measurement of turbulent fluctuations experiments in isothermal and stratified turbulent flows are explored in the experimental methods section. Special topics include modeling of near wall turbulent flows, compressible turbulent flows, and more.
Numerical Investigation Of Separated Transonic Turbulent Flows With A Multiple Time Scale Turbulence Model
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Author : S. W. Kim
language : en
Publisher:
Release Date : 1990
Numerical Investigation Of Separated Transonic Turbulent Flows With A Multiple Time Scale Turbulence Model written by S. W. Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Turbulence categories.