Experimental analysis of the pressure field induced on a square cylinder by a turbulent flow

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Abstract
This paper is devoted to the study of the mean and fluctuating pressure field that develop on the surface of a square cylinder (side D) placed in homogeneous flows with different intensities ( varies from 3 to 17.5% and L11/D varies from 0.1 to 2. This range of experimental conditions is more extensive than that of Lee (1975). Lee's results are largely confirmed, in particular the influence of varying turbulence intensity on the mean pressure distribution in the recirculation region is much stronger than that of varying the integral scale. The theory proposed by Durbin & Hunt (1980) for the prediction of the pressure spectrum at the stagnation point has been shown to be adequate for low frequencies but only qualitative at high frequencies. Finally, measurements of cross-spectra, taken for different points on the same cross-section, have shown how the fluctuating surface pressure field downwind of separation has a narrowband component at the Strouhal frequency that is sensitive to the turbulence, and a broadband component generated by the recirculating flow that is insensitive to the upwind turbulence.