Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN Print: 1-56700-135-1

THE PDF PROFILE IN THE LOG-LAW REGION AND THE CONTRIBUTION FROM COHERENT STRUCTURES

Аннотация

In a zero-pressure gradient turbulent boundary layer, we made a multi-point measurement by 24 I-probes in an area from 7.0 to 322.0 in wall unit. The log-law region is defined first by the invariant assumption of pdfs which is a new idea to fix the logarithmic velocity extent, and then the relation to the coherent structures are considered by POD technique and stochastic estimation. Coherent structures play an important role to make up the log-law profile and they are almost the same order of log-law region.