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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) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722011550 Total Pages :24 pages Book Rating :4.0/5 (115 download)
Book Synopsis A New Time Scale Based K-Epsilon Model for Near Wall Turbulence by : National Aeronautics and Space Administration (NASA)
Download or read book A New Time Scale Based K-Epsilon Model for Near Wall Turbulence written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-28 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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...
Book Synopsis A New Time Scale Based K-Epsilon Model for Near Wall Turbulence by : National Aeronautics and Space Administration NASA
Download or read book A New Time Scale Based K-Epsilon Model for Near Wall Turbulence written by National Aeronautics and Space Administration NASA and published by . This book was released on 2018-10-23 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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...
Book Synopsis A New Time Scale Based K-e Model for Near Wall Turbulence by : Z. Yang
Download or read book A New Time Scale Based K-e Model for Near Wall Turbulence written by Z. Yang and published by . This book was released on 1992 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721997961 Total Pages :32 pages Book Rating :4.9/5 (979 download)
Book Synopsis A Critical Evaluation of Two-Equation Models for Near Wall Turbulence by : National Aeronautics and Space Administration (NASA)
Download or read book A Critical Evaluation of Two-Equation Models for Near Wall Turbulence written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-27 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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..
Book Synopsis An Improved K-epsilon Model for Near-wall Turbulence and Comparison with Direct Numerical Simulation by :
Download or read book An Improved K-epsilon Model for Near-wall Turbulence and Comparison with Direct Numerical Simulation written by and published by . This book was released on 1990 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Improved [k-epsilon] Model for Near-wall Turbulence and Comparison with Direct Numerical Simulation by : T. H. Shih
Download or read book An Improved [k-epsilon] Model for Near-wall Turbulence and Comparison with Direct Numerical Simulation written by T. H. Shih and published by . This book was released on 1990 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781725098879 Total Pages :38 pages Book Rating :4.0/5 (988 download)
Book Synopsis An Improved K-Epsilon Model for Near-Wall Turbulence and Comparison with Direct Numerical Simulation by : National Aeronautics and Space Administration (NASA)
Download or read book An Improved K-Epsilon Model for Near-Wall Turbulence and Comparison with Direct Numerical Simulation written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-16 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: An improved k-epsilon model for low Reynolds number turbulence near a wall is presented. The near-wall asymptotic behavior of the eddy viscosity and the pressure transport term in the turbulent kinetic energy equation is analyzed. Based on this analysis, a modified eddy viscosity model, having correct near-wall behavior, is suggested, and a model for the pressure transport term in the k-equation is proposed. In addition, a modeled dissipation rate equation is reformulated. Fully developed channel flows were used for model testing. The calculations using various k-epsilon models are compared with direct numerical simulations. The results show that the present k-epsilon model performs well in predicting the behavior of near-wall turbulence. Significant improvement over previous k-epsilon models is obtained. Shih, T. H. Glenn Research Center NASA-TM-103221, ICOMP-90-16, E-5635, NAS 1.15:103221 NASA ORDER C-99066-G; RTOP 505-62-21...
Book Synopsis Near-wall K-epsilon Turbulence Modeling by :
Download or read book Near-wall K-epsilon Turbulence Modeling written by and published by . This book was released on 1987 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Galilean and Tensorial Invariant K-e Model for Near Wall Turbulence by : Z. Yang
Download or read book A Galilean and Tensorial Invariant K-e Model for Near Wall Turbulence written by Z. Yang and published by . This book was released on 1993 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of the K-Epsilon Turbulence Model by : B. Mohammadi
Download or read book Analysis of the K-Epsilon Turbulence Model written by B. Mohammadi and published by . This book was released on 1994-09-06 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aimed at applied mathematicians interested in the numerical simulation of turbulent flows. Centered around the k-&epsis; model, it also deals with other models such as one equation models, subgrid scale models and Reynolds Stress models. Presents the k-&epsis; method for turbulence in a language familiar to applied mathematicians, but has none of the technicalities of turbulence theory.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781724264602 Total Pages :30 pages Book Rating :4.2/5 (646 download)
Book Synopsis Computation of Turbulent Flows Using an Extended K-Epsilon Turbulence Closure Model by : National Aeronautics and Space Administration (NASA)
Download or read book Computation of Turbulent Flows Using an Extended K-Epsilon Turbulence Closure Model written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-26 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extended kappa-epsilon turbulence model is proposed and tested with successful results. An improved transport equation for the rate of dissipation of the turbulent kinetic energy, epsilon, is proposed. The proposed model gives more effective response to the energy production rate than does the standard kappa-epsilon turbulence model. An extra time scale of the production range is included in the dissipation rate equation. This enables the present model to perform equally well for several turbulent flows with different characteristics, e.g., plane and axisymmetric jets, turbulent boundary layer flow, turbulent flow over a backward-facing step, and a confined turbulent swirling flow. A second-order accurate finite difference boundary layer code and a nearly second-order accurate finite difference elliptic flow solver are used for the present numerical computations. Chen, Y.-S. and Kim, S.-W. Unspecified Center NASA-CR-179204, NAS 1.26:179204 NAS8-35918
Author :José A. Camberos Publisher :American Institute of Aeronautics & Astronautics ISBN 13 :9781600868399 Total Pages :0 pages Book Rating :4.8/5 (683 download)
Book Synopsis Exergy Analysis and Design Optimization for Aerospace Vehicles and Systems by : José A. Camberos
Download or read book Exergy Analysis and Design Optimization for Aerospace Vehicles and Systems written by José A. Camberos and published by American Institute of Aeronautics & Astronautics. This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book illustrates the editors' application of a scientific principle, the second law of thermodynamics, for aerospace engineering. It discusses how they applied this law to advance aerospace systems analysis and design optimization. It also discusses their research program which incorporates a systematic theoretical basis for constructing the proper formulas quantifying exergy balance, development of new computational capabilities for calculating exergy destruction, and exploration of novel approaches for system-level design. Topics include: identification of the upper limits on engineering system performance using the second law of thermodynamics; design methodology integration with tools developed in CFD and MDA/MDO; application of exergy methods to all levels of flight vehicle design; and, future directions, including constructal theory, quantum thermodynamics, and numerical methods in light of the second law
Book Synopsis A Critical Evaluation of Two-equation Models for Near Wall Turbulence by : Institute for Computer Applications in Science and Engineering
Download or read book A Critical Evaluation of Two-equation Models for Near Wall Turbulence written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1990 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Improved Near-wall K-[epsilon] Model for the Calculation of Wall Bounded Turbulent Flows by : Arup Sarkar
Download or read book An Improved Near-wall K-[epsilon] Model for the Calculation of Wall Bounded Turbulent Flows written by Arup Sarkar and published by . This book was released on 1995 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Kolmogorov Behavior of Near-wall Turbulence and Its Application in Turbulence Modeling by : Tsan-Hsing Shih
Download or read book Kolmogorov Behavior of Near-wall Turbulence and Its Application in Turbulence Modeling written by Tsan-Hsing Shih and published by . This book was released on 1992 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling of Near-wall Turbulence by : T. H. Shih
Download or read book Modeling of Near-wall Turbulence written by T. H. Shih and published by . This book was released on 1990 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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