Vortex tubes in velocity fields of laboratory isotropic turbulence
نویسندگان
چکیده
منابع مشابه
Vortex tubes in velocity fields of laboratory isotropic turbulence: dependence on the Reynolds number.
The streamwise and transverse velocities are measured simultaneously in isotropic grid turbulence at relatively high Reynolds numbers Re(lambda) approximately 110-330. Using a conditional averaging technique, we extract typical intermittency patterns that are consistent with velocity profiles of a model for a vortex tube, i.e., Burgers vortex. The radii of the vortex tubes are several of the Ko...
متن کاملVortex Tubes in Turbulence Velocity Fields at High Reynolds Numbers
The elementary structures of turbulence, i.e., vortex tubes, are studied using velocity data obtained in laboratory experiments for boundary layers and duct flows at microscale Reynolds numbers Reλ = 332–1934. While past experimental studies focused on intense vortex tubes, the present study focuses on all vortex tubes with various intensities. We obtain the mean velocity profile. The radius sc...
متن کاملVelocity autocorrelations of decaying isotropic homogeneous turbulence
Velocity autocorrelations and the mean-square displacements of fluid particles are obtained for decaying, isotropic homogeneous turbulence by numerical simulation of the flow field, using 1283 and 256’ grids, and tracking several tens of thousands of fluid particles, using a third-order interpolation scheme. A self-preserving Lagrangian velocity autocorrelation coefficient is found in terms of ...
متن کاملCalculation of velocity structure functions for vortex models of isotropic turbulence
Velocity structure functions (up 82up) m are calculated for vortex models of isotropic turbulence. An integral operator is introduced which defines an isotropic two-point field from a volume-orientation average for a specific solution of the Navier–Stokes equations. Applying this to positive integer powers of the longitudinal velocity difference then gives explicit formulas for (up 82up) m as a...
متن کاملVortices within vortices: hierarchical nature of vortex tubes in turbulence
Kai Bürger, ∗ Marc Treib, † Rüdiger Westermann, ‡ Suzanne Werner, § Cristian C Lalescu, ¶ Alexander Szalay, ∗∗ Charles Meneveau, †† and Gregory L Eyink 3, 4, ‡‡ Informatik 15 (Computer Graphik & Visualisierung), Technische Universität München, 85748 Garching bei München, Germany Department of Physics & Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA Department of Applied Mathe...
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: Physics Letters A
سال: 2000
ISSN: 0375-9601
DOI: 10.1016/s0375-9601(00)00649-6