The Structure of Turbulence Over Smooth and Rough Walls

Several spanwise lengthscales are shown to vary linearly with distance from the wall, revealing self-similar growth of spanwise structure in an average sense. However, inspection of the data suggests individual structures do not grow strictly self-similarly in time. It is proposed that additional scale growth occurs by the merging of vortex packets on an eddy-by-eddy basis via a vortex leg-annihilation mechanism similar to that suggested by Perry and Chong (1982). The proposed mechanism provides a link between vortex-pairing concepts and the observed coalescence of streaky low-speed regions in the inner layer.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Theoretical and Applied Mechanics

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Tomkins, Christopher David

Contributors dc:contributor

• Adrian, Ronald J.

• Engineering, Aerospace

Language dc:language

eng

Identifier

(MiAaPQ)AAI9996692

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/87778