On the measurement of small-scale turbulence

Robert Antonia, Discipline of Mechanical Engineering, University of Newcastle, Callaghan, Australia

Accurate measurements of small-scale velocity and scalar fluctuations remain a worthwhile goal for turbulence researchers, especially in view of available theoretical results, such as the Karman-Howarth equation.

Topics to be covered will include the appropriateness of spatial-resolution corrections and the assumption of local isotropy. Although the majority of the results will pertain to the hot wire, difficulties associated with optical techniques ,such as PIV, will also be addressed . The process of validating small-scale data has benefited significantly from the calibration of sensors in grid turbulence as well as the use of DNS data bases.