Transition and Turbulence Modeling of High-lift Configurations Using K-[enstrophy Symbol] Model PDF Download
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![Transition and Turbulence Modeling of High-lift Configurations Using K-[enstrophy Symbol] Model PDF](https://books.google.com/books/content/images/frontcover/SGJANwAACAAJ?fife=w150-h200)
Author: Ryan Michael Czerwiec
Publisher:
ISBN:
Category : Turbulence
Languages : en
Pages : 142
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![Transition and Turbulence Modeling of High-lift Configurations Using K-[enstrophy Symbol] Model PDF](https://books.google.com/books/content/images/frontcover/SGJANwAACAAJ?fife=w80-h100)
Author: Ryan Michael Czerwiec
Publisher:
ISBN:
Category : Turbulence
Languages : en
Pages : 142
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Book Description
![Turbulence Modeling for High-lift Multi-element Airfoil Configurations [microform] PDF](https://books.google.com/books/content/images/frontcover/AmVZAAAACAAJ?fife=w80-h100)
Author: Philippe Godin
Publisher: Library and Archives Canada = Bibliothèque et Archives Canada
ISBN: 9780612942325
Category : Lift (Aerodynamics)
Languages : en
Pages : 272
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Book Description
This study provides a detailed comparison of two turbulence closures for aerodynamic flows around high-lift airfoils; the first based on turbulent viscosity and the second on the algebraic Reynolds-stress approximation. A detailed analysis of their derivation helps shed light on their inherent limitations in predicting complex flow phenomena such as confluent boundary layers and flow separation found in typical take-off and landing conditions. One of each of the following categories: one-equation, two-equation, IARSM and EARSM is selected and compared on several low-speed high-lift configurations. Comparisons to experimental data for both mean flow and turbulence quantities are provided for all cases studied. Amongst the turbulent viscosity models coded and studied are the Spalart-Allmaras, Baldwin-Barth, Wilcox k - o and Menter's Shear Stress Transport model. A parameter study based on different pressure-strain correlations and dissipation models (or near-wall treatment) is included when studying the algebraic Reynolds-stress models for both the explicit (EARSM) and the more traditional or implicit (IARSM) forms. Results are generally very promising and of sufficient accuracy for engineering interest. Overall, the study indicates that for flows around low-speed high-lift airfoils, the algebraic Reynolds-stress construct does not represent a higher level of description than the eddy viscosity models since it fails to improve on accuracy. The basic underlying assumption of weak-equilibrium in algebraic Reynolds-stress models is outperformed by well calibrated eddy-viscosity models.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722431129
Category :
Languages : en
Pages : 38
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This report details calculations for the McDonnell-Douglas 30P/30N and the NHLP-2D three-element highlift configurations. Calculations were performed with the Reynolds averaged Navier-Stokes code ISAAC to study the effects of various numerical issues on high lift predictions. These issues include the effect of numerical accuracy on the advection terms of the turbulence equations, Navier-Stokes versus the thin-layer Navier-Stokes approximation, an alternative formulation of the production term, and the performance of several turbulence models. The effect of the transition location on the NHLP-2D flow solution was investigated. Two empirical transition models were used to estimate the transition location. Morrison, Joseph H. Langley Research Center NAS1-96014...
Author:
Publisher:
ISBN:
Category : Turbulence
Languages : en
Pages : 172
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Author: A. Hanifi
Publisher: Springer Science & Business Media
ISBN: 9780792359890
Category : Science
Languages : en
Pages : 548
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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: B. Mohammadi
Publisher:
ISBN:
Category : Mathematics
Languages : en
Pages : 222
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Book Description
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: Joseph H. Morrison
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
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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: 9781722918699
Category :
Languages : en
Pages : 44
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Research conducted during the past three and a half years aimed at developing and testing a turbulence/transition model applicable to high-speed turbulent flows is summarized. The first two years of the project focused on fully turbulent flows, while emphasis shifted to boundary-layer development in the transition region during the final year and a half. A brief summary of research accomplished during the first three years is included and publications that describe research results in greater detail are cited. Research conducted during the final six months of the period of performance is summarized. The primary results of the last six months of the project are elimination of the k-omega model's sensitivity to the freestream value of omega and development of a method for triggering transition at a specified location, independent of the freestream turbulence level. Wilcox, David C. Unspecified Center DAAL03-89-C-0032; NASA ORDER L-54880-C; RTOP 505-59-50-01...
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 172
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