TY - BOOK
T1 - Effect of Reynolds number and a low-intensity freestream turbulence on the flow around a circular cylinder
AU - Norberg, Christoffer
PY - 1987/5
Y1 - 1987/5
N2 - This paper presents experimental results from measurements on circular cylinders of differentdiameters in cross flow. The Reynolds number was varied from about 50 to 2·105. Thecombined effects of Reynolds number and a low-intensity freestream turbulence (Tu =1.4%)on the variation of different coefficients, e.g., Strouhal number, mean and RMS pressurecoefficients, are presented. The results indicate that the flow is rather insensitive to anincrease in the turbulence intensity at Reynolds numbers less than about 103. In thisinvestigation, this is probably due to the large relative scales of the freestream turbulence atthese Reynolds numbers (quasi-stationary flow). At higher Reynolds numbers (greater thanabout 103), the influence of turbulence is significant, especially concerning the pressure forceson the cylinder. It was found that the flow seems to exhibit a basic change at a Reynoldsnumber of about 5·103 (4·103 with turbulence). For instance, the relative Strouhal bandwidthchanges by about one order of magnitude around this Reynolds number. A sub-division of thesubcritical regime at this Reynolds number is proposed.
AB - This paper presents experimental results from measurements on circular cylinders of differentdiameters in cross flow. The Reynolds number was varied from about 50 to 2·105. Thecombined effects of Reynolds number and a low-intensity freestream turbulence (Tu =1.4%)on the variation of different coefficients, e.g., Strouhal number, mean and RMS pressurecoefficients, are presented. The results indicate that the flow is rather insensitive to anincrease in the turbulence intensity at Reynolds numbers less than about 103. In thisinvestigation, this is probably due to the large relative scales of the freestream turbulence atthese Reynolds numbers (quasi-stationary flow). At higher Reynolds numbers (greater thanabout 103), the influence of turbulence is significant, especially concerning the pressure forceson the cylinder. It was found that the flow seems to exhibit a basic change at a Reynoldsnumber of about 5·103 (4·103 with turbulence). For instance, the relative Strouhal bandwidthchanges by about one order of magnitude around this Reynolds number. A sub-division of thesubcritical regime at this Reynolds number is proposed.
M3 - Report
T3 - Publikation
BT - Effect of Reynolds number and a low-intensity freestream turbulence on the flow around a circular cylinder
PB - Chalmers University of Technology
CY - Gothenburg, Sweden
ER -