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Compressive and extensive strain along gradient trajectories

Gampert, Markus ; Goebbert, Jens Henrik ; Schaefer, Philip ; Gauding, Michael ; Peters, Norbert ; Aldudak, Fettah ; Oberlack, Martin :
Compressive and extensive strain along gradient trajectories.
[Online-Edition: http://stacks.iop.org/1742-6596/318/i=5/a=052029]
In: Journal of Physics: Conference Series, 318 (5) 052029/1-052029/11. ISSN 1742-6588
[Artikel], (2011)

Offizielle URL: http://stacks.iop.org/1742-6596/318/i=5/a=052029

Kurzbeschreibung (Abstract)

Based on direct numerical simulations of forced turbulence, shear turbulence, decaying turbulence, a turbulent channel flow as well as a Kolmogorov flow with Taylor based Reynolds numbers Reλ between 69 and 295, the normalized probability density function of the length distribution ˜ P( ˜ l ) of dissipation elements, the conditional mean scalar difference < Δ k | l > at the extreme points as well as the scaling of the two-point velocity difference along gradient trajectories < Δ u_n > are studied. Using the field of the instantanous turbulent kinetic energy k as a scalar, we find a good agreement between the model equation for ˜ P ( ˜ l ) as proposed by Wang and Peters (2008) and the results obtained in the different DNS cases. This confirms the independance of the model solution from both, the Reynolds number and the type of turbulent flow, so that it can be considered universally valid. In addition, we show a 2/3 scaling for the mean conditional scalar difference. In the second part of the paper, we examine the scaling of the conditional two-point velocity difference along gradient trajectories. In particular, we compare the linear s/τ scaling, where τ denotes an integral time scale and s the separation arclength along a gradient trajectory in the inertial range as derived by Wang (2009) with the s·a_∞ scaling, where a_∞ denotes the asymtotic value of the conditional mean strain rate of large dissipation elements.

Typ des Eintrags: Artikel
Erschienen: 2011
Autor(en): Gampert, Markus ; Goebbert, Jens Henrik ; Schaefer, Philip ; Gauding, Michael ; Peters, Norbert ; Aldudak, Fettah ; Oberlack, Martin
Titel: Compressive and extensive strain along gradient trajectories
Sprache: Englisch
Kurzbeschreibung (Abstract):

Based on direct numerical simulations of forced turbulence, shear turbulence, decaying turbulence, a turbulent channel flow as well as a Kolmogorov flow with Taylor based Reynolds numbers Reλ between 69 and 295, the normalized probability density function of the length distribution ˜ P( ˜ l ) of dissipation elements, the conditional mean scalar difference < Δ k | l > at the extreme points as well as the scaling of the two-point velocity difference along gradient trajectories < Δ u_n > are studied. Using the field of the instantanous turbulent kinetic energy k as a scalar, we find a good agreement between the model equation for ˜ P ( ˜ l ) as proposed by Wang and Peters (2008) and the results obtained in the different DNS cases. This confirms the independance of the model solution from both, the Reynolds number and the type of turbulent flow, so that it can be considered universally valid. In addition, we show a 2/3 scaling for the mean conditional scalar difference. In the second part of the paper, we examine the scaling of the conditional two-point velocity difference along gradient trajectories. In particular, we compare the linear s/τ scaling, where τ denotes an integral time scale and s the separation arclength along a gradient trajectory in the inertial range as derived by Wang (2009) with the s·a_∞ scaling, where a_∞ denotes the asymtotic value of the conditional mean strain rate of large dissipation elements.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of Physics: Conference Series
Band: 318
(Heft-)Nummer: 5
Verlag: Institute of Physics
Fachbereich(e)/-gebiet(e): Fachbereich Maschinenbau > Strömungsdynamik
Fachbereich Maschinenbau
Hinterlegungsdatum: 06 Jan 2012 07:29
Offizielle URL: http://stacks.iop.org/1742-6596/318/i=5/a=052029
Zusätzliche Informationen:

13th European Turbulence Conference (ETC13), Warsaw, Poland, 5th - 8th September, 2011

ID-Nummer: 10.1088/1742-6596/318/5/052029
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