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Advances in Turbulence VI: Proceedings of the Sixth European by G. Bärwolff, H. Wengle, H. Jeggle (auth.), S. Gavrilakis, L.

By G. Bärwolff, H. Wengle, H. Jeggle (auth.), S. Gavrilakis, L. Machiels, P. A. Monkewitz (eds.)

Advances in Turbulence VI provides an replace at the country of turbulence study with a few bias in the direction of learn in Europe, because it represents a virtually whole selection of the paper displays on the Sixth ecu Turbulence Conference, backed by way of EUROMECH, ERCOFTAC and value, and held on the Swiss Federal Institute of know-how in Lausanne, July 2-5, 1996. the matter of transition, including the structural description of turbulence, and the scaling legislation of absolutely constructed turbulence have persevered to obtain so much awareness via the examine neighborhood and masses growth has been made because the final eu Turbulence convention in 1994. the amount is hence geared in the direction of experts within the quarter of movement turbulence who couldn't attend the convention, in addition to anyone who needs speedy to evaluate the main energetic present examine components and the teams linked to them.

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Additional info for Advances in Turbulence VI: Proceedings of the Sixth European Turbulence Conference, held in Lausanne, Switzerland, 2–5 July 1996

Example text

In contrast to the classical LES formulation we have even a SGS term in the continuity equation. There are several consequences of these SGS terms. One is related to the number of required boundary conditions, which is larger than the number required for the unfiltered equations. Secondly, the mean velocity vector does not vanish at solid walls. It can be shown to be O(~2). Thirdly, the form of the SGS given in (7) is computationally less favorable due to the presence of the Laplacian of the pressure.

The upstream velocity profile is the same as the mean experimental velocity profile, perturbed by a weak 3D random white noise. Here, the mean quantities (velocity, rms velocity fluctuations, Reynolds stresses) are in good experimental agreement. Figure 1-b shows the low-pressure field, which indicates (as in Figure 1-a) the helical pairing of vortices before the reattachment. Vorticity maps downstream are similar to Figure I-a . Figure 1: LES of a non-stratified backstepi a) high step, regular grid, low-pressure and longitudinal vorticitYi b) low step, grid refinement, low pressure.

More precisely, Figure 1-a represents low-pressure and streamwise vorticity in this simulation at t == 70Uo/ H (where Uo is the incoming velocity). Large billows undergoing helical pairing are shed up to the reattachment, and then transform into weaker longitudinal A-shaped vortices. Since in this simulation the statistical agreement with the experiment of Eaton and Johnston (1980) is not very good for second-order quantities, we have redone with our code the simulation of Jovic and Driver's (1980) experiment, at Re == 5100.

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