Effect of Spacing between Two Adjoining Circular Cylinders on Flow around Two-Dimensional Circular Cylinder Rows with Elastic Support. 1st Report. A Single Row in Side-by-Side Arrangement.

Abstract

This paper describes the effect of the spacing between two adjoining circular cylinders on the flow around two-dimensional circular cylinders supported by wires. The experiment was carried out in an N.P.L. blow-down unit wind tunnel with a working section of 500×500×2000mm, at the Reynolds number 9.4×103. The frequency of vortex shedding from the circular cylinder, displacement of the vibrating circular cylinder, and the time-mean and fluctuating surface pressure distributions on the circular cylinder were measured. The present results were compared with those for the case of fixed support Vortex shedding from circular cylinders occurs in the range of spacing ratio S/D≥2.3. The variations of Strouhal number, displacement, surface pressure distributions, drag coefficient, lift coefficient, fluctuating drag coefficient and fluctuating lift coefficient with the spacing ratio were obtained.