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7 papers · 2 filters
The Lundgren-Monin-Novikov Hierarchy: Kinetic Equations for Turbulence
R. Friedrich, A. Daitche, O. Kamps +3
We present an overview of recent works on the statistical description of turbulent flows in terms of probability density functions (PDFs) in the framework of the Lundgren-Monin-Nov…
The Equivalence of the Lagrangian-Averaged Navier-Stokes-α Model and the Rational LES model in Two Dimensions
Balasubramanya T. Nadiga, Freddy Bouchet
In the Large Eddy Simulation (LES) framework for modeling a turbulent flow, when the large scale velocity field is defined by low-pass filtering the full velocity field, a Taylor s…
Measuring Lagrangian accelerations using an instrumented particle
Robert Zimmermann, Lionel Fiabane, Yoann Gasteuil +2
Accessing and characterizing a flow impose a number of constraints on the employed measurement techniques; in particular optical methods require transparent fluids and windows in t…
Experimental observation of a strong mean flow induced by internal gravity waves
Guilhem Bordes, Antoine Venaille, Sylvain Joubaud +2
We report the experimental observation of a robust horizontal mean flow induced by internal gravity waves. A wave beam is forced at the lateral boundary of a tank filled with a lin…
Energy cascade and the four-fifths law in superfluid turbulence
Julien Salort, Benoît Chabaud, Emmanuel Lévêque +1
The 4/5-law of turbulence, which characterizes the energy cascade from large to small-sized eddies at high Reynolds numbers in classical fluids, is verified experimentally in a sup…
Turbulent velocity spectra in superfluid flows
J. Salort, C. Baudet, B. Castaing +12
We present velocity spectra measured in three cryogenic liquid 4He steady flows: grid and wake flows in a pressurized wind tunnel capable of achieving mean velocities up to 5 m/s a…