Studying the spatial distribution in coherent fields such as turbulent and turbulent-induced force ones is important to model and evaluate turbulent-induced forces and response of structures on the turbulent flows. Turbulent field-based coherent function is commonly used for the spatial distribution characteristic of induced forces in the frequency domain. This paper will focus to study spectral coherent structure of turbulence and forces in not only the frequency domain using conventional Fourier transform-based coherence, but also temporo-spectral coherent one in the time-frequency plane thanks to wavelet transform-based coherence for more understanding of the turbulence and force coherences and their spatial distributions. Effects of spanwise separations, bluff body flow and flow conditions on coherent structures of turbulence and induced pressure, comparison between turbulence and pressure coherences as well as intermittency of coherent structure in the time-frequency plane will be investigated here.




Bendat, J.S. and Piersol, A.G. (2000), Random data: analysis and measurement procedures, 3rd Edition, John Wiley and Sons.

Cherry, N.J., Hillier, R., and Latour, M.E.M. (1984), Unsteady measurements in a separated and reattaching flow, Journal of Fluid Mechanics, 144, pp. 13-46.

Daubechies, I. (1992), Ten lectures on wavelets, Society for Industrial and Applied Mathematics (SIAM).

Davenport, A.G. (1963), The response of slender, line-like structures to a gusty wind, Proceedings of Institution of Civil Engineers, 23, pp. 389-408.

Hillier, R. and Cherry, N.J. (1981), The effects of stream turbulence on separation bubbles, Journal of Wind Engineering and Industrial Aerodynamics, 8, pp. 49-58.

Jakobsen, J.B. (1997), Span-wise structure of lift and overturning moment on a motionless bridge girder, Journal of Wind Engineering and Industrial Aerodynamics, 69-71, pp. 795805.

Kareem, A. and Kijewski, T. (2002), Time-frequency analysis of wind effects on structures, Journal of Wind Engineering and Industrial Aerodynamics, 90, pp. 1435-1452.

Kimura, K., Fujino, Y., Nakato, S., and Tamura, H. (1997), Characteristics of buffeting forces on plat cylinders, Journal of Wind Engineering and Industrial Aerodynamics, 69-71, pp. 365-374

Larose, G.L. (1996), The span-wise coherence of wind forces on streamlined bridge decks, Proceedings of the Third International Colloquium on Bluff Body Aerodynamics and Applications, Blacksburg, USA.

Matsumoto, M., Shirato, H., Araki, K., Haramura, T., and Hashimoto, T. (2003), Spanwise coherence characteristics of surface pressure field on 2-D bluff bodies, Journal of Wind Engineering and Industrial Aerodynamics, 91, pp. 155-163.

Torrence, C. and Compo, G.P. (1998), A practical guide to wavelet analysis, Bulletin of the American Meteorological Society, 79(1), pp. 61-78.


Download data is not yet available.