Negative streamwise velocities and other rare events near the wall in turbulent flows
نویسندگان
چکیده
منابع مشابه
The largest scales of turbulent wall flows
The small scales of wall-bounded turbulent flows have received a lot of attention in recent years, especially in the near-wall region, in part because of the availability of direct numerical simulations that made their detailed study possible (Kim, Moin & Moser 1987). Since those simulations had necessarily moderate Reynolds numbers and little or no separation between their largest and smallest...
متن کاملSpace-time correlations of fluctuating velocities in turbulent shear flows.
Space-time correlations or Eulerian two-point two-time correlations of fluctuating velocities are analytically and numerically investigated in turbulent shear flows. An elliptic model for the space-time correlations in the inertial range is developed from the similarity assumptions on the isocorrelation contours: they share a uniform preference direction and a constant aspect ratio. The similar...
متن کاملScaling of near-wall flows in quasi-two-dimensional turbulent channels.
The law of the wall and the log law rule the near-wall mean velocity profile of three-dimensional turbulent flows. These well-known laws, which are validated by legions of experiments and simulations, may be universal. Here, using a soap-film channel, we report the first experimental test of these laws in quasi-two-dimensional turbulent channel flows under two disparate turbulent spectra. We fi...
متن کاملWall Y+ Strategy for Dealing with Wall-bouded Turbulent Flows
A strategy for dealing with turbulent flows over a two dimensional surface mounted obstacle using the wall y as guidance in selecting the appropriate grid configuration and corresponding turbulence models are investigated using Fluent. The CFD results were compared with experimental data from Zeidan’s Turbulent Shear Recovery behind Obstacles on Smooth and Rough Surfaces. Both undisturbed and d...
متن کاملCascades and wall-normal fluxes in turbulent channel flows
A. Cimarelli1,2,†, E. De Angelis1,3, J. Jiménez4 and C. M. Casciola5 1DIN, Università di Bologna, 47121 Forlì, Italy 2DISMI, Università di Modena e Reggio Emilia, 42122 Reggio Emilia, Italy 3School of Engineering, Cardiff University, Queen’s Buildings, Cardiff CF24 3AA, UK 4School of Aeronautics, Universidad Politécnica de Madrid, 28040 Madrid, Spain 5DIMA, Università di Roma La Sapienza, 00185...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2011
ISSN: 1742-6596
DOI: 10.1088/1742-6596/318/2/022013