ZIB

Treffer pro Seite

Treffer 1 - 3 | 3 Treffer

Sortierung

Buch

Turbulence, coherent structures, dynamical systems and symmetry / (1998)

Holmes, Philip ; Lumley, John L. ; Berkooz, Gal

Cambridge :Cambridge Univ. Press,

zur Merkliste hinzufügen auf der Merkliste

Details

Titel: Turbulence, coherent structures, dynamical systems and symmetry /

Autor: Holmes, Philip

Beteiligte Person(en): Lumley, John L. , Berkooz, Gal

Ausgabe: 1. paperback ed

Verlag: Cambridge :Cambridge Univ. Press,

Erscheinungsjahr: 1998

Seiten: XVIII., 420 S. : , Ill ; , 23cm

Serie: Cambridge monographs on mechanics

ISBN: 0-521-63419-9 , 0-521-55142-0

Materialart: Buch

Sprache: Englisch

URL: 01 (lizenzfrei)

URL: 04

Permalink

Bibliothek	Standort	Signatur	Band/Heft/Jahr	Verfügbarkeit

Andere fanden auch interessant ...

ZIB Katalog

Zuse-Institut Berlin

Digitale Medien

Low-dimensional models for flows with density fluctuations (1997)

Lumley, John L. ; Poje, Andrew

[S.l.] : American Institute of Physics (AIP)

Physics of Fluids 9 (1997), S. 2023-2031

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A low-dimensional model, using the proper orthogonal, or Karhunen–Loève decomposition, has been remarkably successful in representing the behavior of the wall region of a turbulent boundary layer. We briefly summarize this work. We may hope for similar success in other flows in which coherent structures play an important role, in particular flows with density fluctuations. We sketch an approach to such a decomposition for flows with density fluctuations, suggesting various alternatives which weigh the available information differently. In such a low-dimensional model, obtaining the empirical eigenfunctions poses a problem, since they can usually be determined only from extensive measurements or direct numerical simulations. However, recent work with energy method stability theory (modified by use of an anisotropic eddy viscosity and feedback to the mean profile) has been remarkably successful in predicting the form of the empirical eigenfunctions in the isothermal boundary layer. We present here preliminary results for sheared Rayleigh–Bénard convection; these results do not include anisotropic eddy viscosities and feedback, and do not predict directly the form of the POD eigenfunctions; however, a very satisfactory comparison can be made with the second order moments obtained from a DNS. © 1997 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.869321

Permalink

Bibliothek	Standort	Signatur	Band/Heft/Jahr	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

Digitale Medien

CALCULATION OF WALL-BOUNDED COMPLEX FLOWS AND FREE SHEAR FLOWS (1996)

SHIH, T.-H. ; ZHU, J. ; LUMLEY, JOHN L.

Chichester : Wiley-Blackwell

International Journal for Numerical Methods in Fluids 23 (1996), S. 1133-1144

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 0271-2091

Schlagwort(e): turbulence models ; realizability ; complex flows ; Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Maschinenbau

Notizen: Various wall-bounded flows with complex geometries and free shear flows have been studied with a newly developed realizable Reynolds stress algebraic equation model. The model development is based on the invariant theory in continuum mechanics. This theory enables us to formulate a general constitutive relation for the Reynolds stresses. Pope (J. Fluid Mech., 72, 331-340 (1975)) was the first to introduce this kind of constitutive relation to turbulence modelling. In our study, realizability is imposed on the truncated constitutive relation to determine the coefficients so that, unlike the standard k-∊ eddy viscosity model, the present model will not produce negative normal stresses in any situations of rapid distortion. The calculations based on the present model have shown encouraging success in modelling complex turbulent flows.

Zusätzliches Material: 15 Ill.

Materialart: Digitale Medien

Permalink

Bibliothek	Standort	Signatur	Band/Heft/Jahr	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Treffer 1 - 3 | 3 Treffer