Low Reynolds Number Multiple Time Scale Turbulence Model And Calculations Of Steady And Pulsating Shear Layers
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Author | : National Aeronautics and Space Adm Nasa |
Publisher | : |
Total Pages | : 42 |
Release | : 2018-10-21 |
Genre | : |
ISBN | : 9781729008997 |
A low Reynolds number multiple-time-scale turbulence model (LMS) and its application to fully developed turbulent channel flows and pulsating pipe flows are presented. The LMS can describe the inequilibrium turbulence phenomena down to the viscous sublayer. The calculated fluid flow and turbulence fields for the channel flows are in better agreement with the direct numerical simulation (DNS) results than those obtained using a Reynolds stress turbulence model, and the calculated near-wall dissipation rates are in qualitatively correct agreement with the DNS results. The LMS also successfully predicts the rapidly varying phase-lead of the wall shearing stress that occurs in a narrow range of the dimensionless frequency omega (+) = (omega x nu)/(upsilon x tau(exp2)) for the pulsating pipe flows while various other turbulence models fail to predict this phenomenon, and the LMS yields significantly improved numerical results for a wide range of the dimensionless frequency compared with those obtained using a rapid distortion theory (RDT). Kim, Sang-Wook Unspecified Center NCC3-229...
Author | : |
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Total Pages | : 42 |
Release | : 1992 |
Genre | : |
ISBN | : |
Author | : Sang-uk Kim |
Publisher | : |
Total Pages | : 36 |
Release | : 1992 |
Genre | : |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 704 |
Release | : 1995 |
Genre | : Aeronautics |
ISBN | : |
Author | : Jean Piquet |
Publisher | : Springer Science & Business Media |
Total Pages | : 767 |
Release | : 2013-04-17 |
Genre | : Technology & Engineering |
ISBN | : 3662035596 |
obtained are still severely limited to low Reynolds numbers (about only one decade better than direct numerical simulations), and the interpretation of such calculations for complex, curved geometries is still unclear. It is evident that a lot of work (and a very significant increase in available computing power) is required before such methods can be adopted in daily's engineering practice. I hope to l"Cport on all these topics in a near future. The book is divided into six chapters, each· chapter in subchapters, sections and subsections. The first part is introduced by Chapter 1 which summarizes the equations of fluid mechanies, it is developed in C~apters 2 to 4 devoted to the construction of turbulence models. What has been called "engineering methods" is considered in Chapter 2 where the Reynolds averaged equations al"C established and the closure problem studied (§1-3). A first detailed study of homogeneous turbulent flows follows (§4). It includes a review of available experimental data and their modeling. The eddy viscosity concept is analyzed in §5 with the l"Csulting ~alar-transport equation models such as the famous K-e model. Reynolds stl"Css models (Chapter 4) require a preliminary consideration of two-point turbulence concepts which are developed in Chapter 3 devoted to homogeneous turbulence. We review the two-point moments of velocity fields and their spectral transforms (§ 1), their general dynamics (§2) with the particular case of homogeneous, isotropie turbulence (§3) whel"C the so-called Kolmogorov's assumptions are discussed at length.
Author | : S. W. Kim |
Publisher | : |
Total Pages | : 44 |
Release | : 1990 |
Genre | : Turbulence |
ISBN | : |
Author | : Tuncer Cebeci |
Publisher | : Springer Science & Business Media |
Total Pages | : 140 |
Release | : 2003-12-04 |
Genre | : Science |
ISBN | : 9783540402886 |
After a brief review of the more popular turbulence models, the author presents and discusses accurate and efficient numerical methods for solving the boundary-layer equations with turbulence models based on algebraic formulas (mixing length, eddy viscosity) or partial-differential transport equations. A computer program employing the Cebeci-Smith model and the k-e model for obtaining the solution of two-dimensional incompressible turbulent flows without separation is discussed in detail and is presented in the accompanying CD.
Author | : S. W. Kim |
Publisher | : |
Total Pages | : 34 |
Release | : 1988 |
Genre | : Fluid mechanics |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 542 |
Release | : 1972 |
Genre | : Mechanics, Applied |
ISBN | : |
Author | : Ching Jen Chen |
Publisher | : CRC Press |
Total Pages | : 312 |
Release | : 1997-12-01 |
Genre | : Technology & Engineering |
ISBN | : 9781560324058 |
Focuses on the second-order turbulence-closure model and its applications to engineering problems. Topics include turbulent motion and the averaging process, near-wall turbulence, applications of turbulence models, and turbulent buoyant flows.