elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

A direct Navier-Stockes solver for turbulent flows over round steps

Wagner, C. und Dallmann, U.C. (1999) A direct Navier-Stockes solver for turbulent flows over round steps. In: New Results in Numerical and Experimental Fluid Mechanics, 72, Seiten 505-512. Vieweg. 11. DGLR-Fachsymposium der AG STAB, Berlin, 10.-12. November 1998. ISBN 3-528-03122-0.

Dieses Archiv kann nicht den gesamten Text zur Verfügung stellen.

Kurzfassung

Direct Numerical Simulations (DNS) provide an increasing data source to improve our understanding of turbulent flows. Such DNS are especially required (together with generic experiments) to support flow physical modeling od separated, two- and three-dimensional vortex flows. In perspective to improve the prediction of such flows (either by new turbulence models or Large Eddy Simulations (LES) data fields are required which resolve turbulence and unsteady separated flow features. This is still a challenging task. However, a fully conservative, second order accurate, boundary correction method for Cartesian grids has been developed and implemented in an existing direct Navier-Stokes (NS) solver. For the case of a round backward facing channel step, laminar flow results generated with the proposed method agree well with those calculated on curvilinear, colocated grids. A Direct Numerical Simulation (DNS) of the turbulent flow in a minimal channel domain is performed for a Reynolds number based on friction velocity and channel height of ReT=265 for an efficiency analysis. Additionally the turbulent flows in a channel and a round backward facing channel step are calculated by means of DNS. The former simulation provides inflow conditions for the latter. The upstream Reynolds is ReT=360. Good agreement is obtained comparing statistically averaged variables of the turbulent channel flow with those of Kim et al. [3]. A mean recirculation zone, with mean separation/reattachment points being located 2.0/7.5 step heights downstream the step entrance, is computed in the DNS through the round backward facing channel step. Instantaneous and statistical flow variables are presented. They give an impression of the complex flow dynamics in the free shear layer, the recirculation and reattachment regions

Dokumentart:Konferenzbeitrag (Paper)
Zusätzliche Informationen: LIDO-Berichtsjahr=1999,
Titel:A direct Navier-Stockes solver for turbulent flows over round steps
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Wagner, C.NICHT SPEZIFIZIERT
Dallmann, U.C.NICHT SPEZIFIZIERT
Datum:1999
Erschienen in:New Results in Numerical and Experimental Fluid Mechanics
Band:72
Seitenbereich:Seiten 505-512
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
W. Nitsche H.-J. Heinemann R. Hilbig, NICHT SPEZIFIZIERT
Verlag:Vieweg
Name der Reihe:Notes on Numerical Fluid Mechanics
ISBN:3-528-03122-0
Status:veröffentlicht
Stichwörter:Direct Numerical Simulations, turbulent round backward facing channel step flow, complex geometries, boundary correction method
Veranstaltungstitel:11. DGLR-Fachsymposium der AG STAB, Berlin, 10.-12. November 1998
Veranstalter :TU Berlin
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:keine Zuordnung
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ST - Starrflüglertechnologien
DLR - Teilgebiet (Projekt, Vorhaben):NICHT SPEZIFIZIERT
Standort: Köln-Porz , Braunschweig , Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Institut für Strömungsmechanik
Hinterlegt von: elib DLR-Beauftragter
Hinterlegt am:16 Sep 2005
Letzte Änderung:14 Jan 2010 20:28

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.