The influence of endplates on the vortex‐shedding mechanism is investigated for Reynolds numbers larger than 300 (irregular range). Near the endplate, a region with a shedding frequency f2 is found, which is lower than the Strouhal frequency f1 observed over the remaining cylinder length. The dominating parameter for this end‐effect is the ratio λ/d, where λ is the distance between the leading edge of the endplate and the cylinder and d is the cylinder diameter. The end‐effect fades away with increasing Reynolds number for a given λ/d. For greater values of λ/d, this fading is observed at higher Reynolds numbers.

Topics
Vortex dynamics
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© 1991 American Institute of Physics.
1991
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