Abstract
Fine scale structure in near-wall turbulence is investigated by using DNS data bases of turbulent channel flows. Fine scale eddies in turbulent channel flows are educed by a new identification scheme. Characteristics of fine scale vortical structures in turbulent channel flow coincide with those in homogeneous isotropic turbulence and turbulent mixing layers. The most expected diameter and maximum azimuthal velocity of the fine scale eddy are about 10 times of the Kolmogorov microscale and about a half of the r.m.s. velocity fluctuation, respectively. These results show that streamwise vortices and hairpin-type vortices near the wall can be classified into the coherent fine scale structure in turbulence. Near the wall, probability density functions of inclination angles and tilting angles of the coherent fine scale eddy show regularity in their spatial distribution, which corresponds to the anisotophy of the near-wall turbulence.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
