The aim of the present work is an experimental investigation of both large- and small-scale turbulent properties of the boundary layer over a flat plate at Re_\theta \approx 15000. We focus on the scaling behaviour of the two-points correlation tensor of order p measured at different distances from the wall. By projecting each component of the tensor on the so-called sectors of the group of rotations SO(3), it is possible to extract the isotropic contribution and to distinguish between different kinds of anisotropies. The contribution from the isotropic sector is completely described throughout the entire inner region by two sets of universal exponents, pertaining respectively to the small- and the large-scale ranges. Preliminary measurements seem to suggest a similar behaviour also for the pure anisotropic terms of the correlation tensor.
Anisotropic fluctuations in a turbulent boundary layer
B Jacob;
2006
Abstract
The aim of the present work is an experimental investigation of both large- and small-scale turbulent properties of the boundary layer over a flat plate at Re_\theta \approx 15000. We focus on the scaling behaviour of the two-points correlation tensor of order p measured at different distances from the wall. By projecting each component of the tensor on the so-called sectors of the group of rotations SO(3), it is possible to extract the isotropic contribution and to distinguish between different kinds of anisotropies. The contribution from the isotropic sector is completely described throughout the entire inner region by two sets of universal exponents, pertaining respectively to the small- and the large-scale ranges. Preliminary measurements seem to suggest a similar behaviour also for the pure anisotropic terms of the correlation tensor.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
