Advances in Turbulence V: Proceedings of the Fifth European by R. A. Antonia, Y. Zhu, M. Sokolov (auth.), Roberto Benzi

By R. A. Antonia, Y. Zhu, M. Sokolov (auth.), Roberto Benzi (eds.)

Under the auspices of the Euromech Committee, the 5th eu Turbulence convention used to be held in Siena on 5-8 July 1994. Following the former and so on assembly in Lyon (1986), Berlin (1988), Stockholm (1990) and Delft (1992), the 5th and so on used to be aimed toward offering a evaluate of the basic facets of turbulence from a theoretical, numerical and experimental viewpoint. within the wonderful city of Siena, greater than 250 scientists from worldwide, spent 4 days discussing new principles on turbulence. As a examine employee within the box of turbulence, i need to say that the works provided on the convention, on which this ebook is predicated, lined just about all parts during this box. I additionally imagine that this ebook presents a huge chance to have a whole assessment of the latest study works. i'm super thankful to Prof. C. Cercignani, Dr. M. Loffredo, and Prof. R. Piva who, as individuals of the neighborhood organizing committee, percentage the good fortune of the convention. I additionally are looking to thank Mrs. Liu' Catena, for her useful contribution to the paintings performed by way of the neighborhood organizing committee and the eu Turbulence Committee within the clinical association of the assembly. The "Servizio Congressi" of the college of Siena supplied ideal association in Siena and lovely hospitality. The convention has been supported through CNR, Cira, Alenia, the colleges of Rome "Tor Vergata" and "La Sapienza".

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Extra info for Advances in Turbulence V: Proceedings of the Fifth European Turbulence Conference, Siena, Italy, 5–8 July 1994

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N::. ,~ y x/{)004 from wake visualization and experimental x/D-6 x ~ J streamwise velocity spectrum. G x/D-Il The nondimensional wake profile x x/D-IZ 2 UIU*=Uo JU*+tanh 2 (2yld), where U* =Uoo - Uo is . . ,,'". I .. , 0 the mean velocity at y=O and d the width of the y/d wake, is used for linear stability analysis. l downstream from the cylinder well fitted by the ~ previous law. -.. ~. > I'> spectra of stream wise velocity component in the U/U* wake at a distance 6D from the cylinder in the point of maximum velocity fluctuation intensity along the Figure 1 y axis.

3. Results In an integral model one satisfies the momentum and buoyancy equation averaged over the plume cross section. To close these equations one needs an entrainment hypothesis which prescribes the inflow in the plume. The entrainment assumption, which uses a constant ratio 0: of time mean entrainment velocity to vertical velocity at the core, results in a linear spread of the plume width. Additional measurements by several researchers have demonstrated that the lateral profiles of vertical velocity and temperature are approximately Gaussian.

A a t y Linear part of the system (3) admits solution of the form: - k ( X, t) = w (Y) W k ej(u x+13 z-wkl) (4) 38 if and only if w k (y) == ('Ilk (Y),CPk (y» and wk are respectively eigenvector and eigenvalue of the linear problem. For a fixed wave number vector k we decompose W k (y, t) into a sum of linear eigenfunctions (5) 11=1 where w~n) (y) is n-th eigenvector and c~n) (t) the n-th unknown eigenmodc amplitude coefficient. Projecting on the adjoint Orr-Sommerfeld eigenfunctions basis ~m>cy) a suitable combination of the two scalar equations from the substitution of (5) into (3) the following nonlinear dynamical system yields (6) .

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