Flow over a cylinder is a fundamental fluid mechanics problem that involves a simple geometry, yet increasingly complex flow patterns as the Reynolds number is increased, most notably the development of a Karman vortex with a natural vortex shedding frequency fs when the Reynolds number exceeds a value of about 40. The goal of this ongoing study is to numerically investigate the effect of an incoming free-stream velocity pulsation with a mean Reynolds number of 100 on the drag force over and vorticity dynamics behind a circular cylinder. This paper reports on initial results involving unsteady, laminar and incompressible flows over a circular cylinder. Sinusoidal free-stream pulsations with amplitudes Av varying between 25% and 75% of the mean free-stream velocity and frequencies f varying between 0.25 and 5 times the natural shedding frequency were considered. Of particular interest to us is the interaction between the pulsating frequency and natural vortex shedding frequency and the resulting effects on drag. Interestingly, at frequencies close to the natural frequency, and to twice the natural frequency, a sudden drop in the mean value of the drag coefficient is observed. This drop in the drag coefficient is also accompanied by a change in the flow and vortex shedding patterns observed behind the cylinder.
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ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
July 24–29, 2011
Hamamatsu, Japan
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4440-3
PROCEEDINGS PAPER
A Numerical Investigation of the Effects of Flow Pulsations on the Drag Force Over a Cylinder
Eric D’herde,
Eric D’herde
Oakland University, Rochester, MI
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Laila Guessous
Laila Guessous
Oakland University, Rochester, MI
Search for other works by this author on:
Eric D’herde
Oakland University, Rochester, MI
Laila Guessous
Oakland University, Rochester, MI
Paper No:
AJK2011-03083, pp. 1539-1548; 10 pages
Published Online:
May 25, 2012
Citation
D’herde, E, & Guessous, L. "A Numerical Investigation of the Effects of Flow Pulsations on the Drag Force Over a Cylinder." Proceedings of the ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D. Hamamatsu, Japan. July 24–29, 2011. pp. 1539-1548. ASME. https://doi.org/10.1115/AJK2011-03083
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