Study of Three-Dimensional Vortex Shedding in the Wake of a Square Cylinder

It is observed that three-dimensional transition process for square cylinder is similar to that of a circular cylinder. Most notably there is a long wave-length three-dimensional disturbance which becomes unstable at a Reynolds number about 170, followed by the appearance of a short wavelength instability. However, this stability analysis also predicts a intermediate wavenumber disturbance which has a shedding frequency twice that of the base flow. This intermediate wavelength mode has not been observed in analysis of the circular cylinder. The presence of this new intermediate wavelength mode may explain the complicated behavior observed in direct numerical simulations of the non-linear three-dimensional Navier-Stokes equations at low Reynolds numbers.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Robichaux, Joseph H.

Contributors dc:contributor

• Balachandar, S.

• Engineering, Mechanical

Language dc:language

eng

Identifier

(MiAaPQ)AAI9812755

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/83960