Two systematic wind tunnel tests were conduct to investigate coherence characteristics of fluctuating wind pressures along the meridian on hemispherical domes due to Reynolds number effect and roof curvature effect. Reynolds number was first alternated from 6.6×104 to 1.9×106 under smooth and boundary layer flows. Root-coherences with respect to frequency and location were calculated to show how the Reynolds number effect changes the coherence distribution, especially when in approaching turbulent flows. Secondly, the roof curvature of the hemispherical dome was changed by f/D (height/span) from 0.5 to 0.1 to see the roof curvature effect. A modified form proposed by Hui et al (2009) was applied to present a more compact observation in a parametric study way rather than by Davenport’s proposed. It was finally concluded that not only the location of the pressure but also the distance between two taps, can significantly determine the distribution features of coherences.
2014年國際風工程研討會暨風工程學術研習會論文集=Proceedings of the International Wind Engineering Symposium and Advanced School on Wind Engineering 2014, 9p.