Numerical study of active flow control of wake induced loading on slender bluff bodies

Authors
Cummings, Reed Matthew
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Other Contributors
Letchford, C. W.
Sahni, Onkar
Amitay, Michael
Symans, Michael D.
Issue Date
2014-08
Keywords
Civil engineering
Degree
PhD
Terms of Use
This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Full Citation
Abstract
The environment in which buildings are constructed is turbulent, which significantly effects the flow around bluff bodies. The final part of the study examined how effective the jets would be in the presence of free stream turbulence. The synthetic eddy method was employed to create turbulent inflow boundary conditions. This inflow matched with homogeneous isotropic turbulence generated in wind tunnels. The base results for turbulent flow around a square prism compared well with wind tunnel data. There was a large force reduction on the square prism with free stream turbulence present similar to the addition of a small rod upstream. The additions of unsteady jets were able to add to the effects of the free stream turbulence promoting partial reattachment of the separated shear layer. This decreased the RMS of the lift coefficient. This showed that the efficiency of the jets was not compromised by free stream turbulence and that unsteady jets can be used in turbulent situations such as a building in the atmospheric boundary layer.
Description
August 2014
School of Engineering
Department
Dept. of Civil and Environmental Engineering
Publisher
Rensselaer Polytechnic Institute, Troy, NY
Relationships
Rensselaer Theses and Dissertations Online Collection
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