| Autor: |
Cortet, Pierre-Philippe, Diribarne, Pantxo, Monchaux, Romain, Chiffaudel, Arnaud, Daviaud, Francois, Dubrulle, Berengere |
| Rok vydání: |
2008 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
We introduce a global quantity $\delta$ that characterizes turbulent fluctuations in inhomogeneous anisotropic flows. This time-dependent quantity is based on spatial averages of global velocity fields rather than classical temporal averages of local velocities. $\delta(t)$ provides a useful quantitative characterization of any turbulent flow through generally only two parameters, its time average $\bar \delta$ and its variance $\delta_2$. Properties of $\bar \delta$ and $\delta_2$ are experimentally studied in the typical case of the von K\'arm\'an flow and used to characterize the scale by scale energy budget as a function of the forcing mode as well as the transition between two flow topologies. |
| Databáze: |
arXiv |
| Externí odkaz: |
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