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Effect of Reynolds number and a low-intensity freestream turbulence on the flow around a circular cylinder

Norberg, Christoffer LU (1987) In Publikation
Abstract
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... (More)
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. (Less)
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author
publishing date
type
Book/Report
publication status
published
subject
in
Publikation
issue
2
pages
54 pages
publisher
Chalmers University of Technology
report number
87
ISSN
0280-9265
language
English
LU publication?
no
id
3d112379-5cc5-4935-a097-6f195d9618f7
date added to LUP
2023-02-15 16:31:37
date last changed
2023-02-21 12:06:26
@techreport{3d112379-5cc5-4935-a097-6f195d9618f7,
  abstract     = {{This paper presents experimental results from measurements on circular cylinders of differentdiameters in cross flow. The Reynolds number was varied from about 50 to 2·10<sup>5</sup>. 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 10<sup>3</sup>. 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 10<sup>3</sup>), 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 5·10<sup>3</sup> (4·10<sup>3</sup> 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.}},
  author       = {{Norberg, Christoffer}},
  institution  = {{Chalmers University of Technology}},
  issn         = {{0280-9265}},
  language     = {{eng}},
  number       = {{87}},
  series       = {{Publikation}},
  title        = {{Effect of Reynolds number and a low-intensity freestream turbulence on the flow around a circular cylinder}},
  url          = {{https://lup.lub.lu.se/search/files/137949583/Norberg_Publikation_87_2.pdf}},
  year         = {{1987}},
}