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

Cummings, Reed Matthew
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Letchford, C. W.
Sahni, Onkar
Amitay, Michael
Symans, Michael D.
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Civil engineering
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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.
August 2014
School of Engineering
Dept. of Civil and Environmental Engineering
Rensselaer Polytechnic Institute, Troy, NY
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