Gampert, Markus ; Goebbert, Jens Henrik ; Schaefer, Philip ; Gauding, Michael ; Peters, Norbert ; Aldudak, Fettah ; Oberlack, Martin (2011)
Compressive and extensive strain along gradient trajectories.
In: Journal of Physics: Conference Series, 318 (5)
doi: 10.1088/1742-6596/318/5/052029
Artikel, Bibliographie
Dies ist die neueste Version dieses Eintrags.
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 |
| Art des Eintrags: | Bibliographie |
| Titel: | Compressive and extensive strain along gradient trajectories |
| Sprache: | Englisch |
| Publikationsjahr: | 2011 |
| Verlag: | Institute of Physics |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Physics: Conference Series |
| Jahrgang/Volume einer Zeitschrift: | 318 |
| (Heft-)Nummer: | 5 |
| DOI: | 10.1088/1742-6596/318/5/052029 |
| URL / URN: | http://stacks.iop.org/1742-6596/318/i=5/a=052029 |
| Zugehörige Links: | |
| 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. |
| Zusätzliche Informationen: | 13th European Turbulence Conference (ETC13), Warsaw, Poland, 5th - 8th September, 2011 |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet für Strömungsdynamik (fdy) Exzellenzinitiative Exzellenzinitiative > Exzellenzcluster Zentrale Einrichtungen Exzellenzinitiative > Exzellenzcluster > Center of Smart Interfaces (CSI) |
| Hinterlegungsdatum: | 06 Jan 2012 07:29 |
| Letzte Änderung: | 07 Feb 2024 06:45 |
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Compressive and extensive strain along gradient trajectories. (deposited 06 Feb 2024 10:05)
- Compressive and extensive strain along gradient trajectories. (deposited 06 Jan 2012 07:29) [Gegenwärtig angezeigt]
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