Abstract
This paper presents data showing the three-dimensional vortical structures in the near wake region of circular cylinders. The in-plane velocity field was measured using a digital Particle Image Velocimetry (PIV) technique. The vortical structures are found to include inclined counter-rotating longitudinal vortices in the braids joining consecutive Kdrmdn vortices. A simple vortex-pair model is proposed to estimate velocity perturbation induced by the longitudinal vortices in the near wake region. The perturbation resulting from the longitudinal vortices is shown to induce spanwise velocity modulation and a velocity spike of a nominally two-dimensional vortex street.
| Original language | English |
|---|---|
| Pages (from-to) | 531-536 |
| Number of pages | 6 |
| Journal | Journal of Fluids Engineering |
| Volume | 118 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Jan 1996 |
Cite this
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Velocity perturbations induced by the longitudinal vortices in a cylinder wake. / Wu, J.; Sheridan, J.; Welsh, M. C.
In: Journal of Fluids Engineering, Vol. 118, No. 3, 01.01.1996, p. 531-536.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Velocity perturbations induced by the longitudinal vortices in a cylinder wake
AU - Wu, J.
AU - Sheridan, J.
AU - Welsh, M. C.
PY - 1996/1/1
Y1 - 1996/1/1
N2 - This paper presents data showing the three-dimensional vortical structures in the near wake region of circular cylinders. The in-plane velocity field was measured using a digital Particle Image Velocimetry (PIV) technique. The vortical structures are found to include inclined counter-rotating longitudinal vortices in the braids joining consecutive Kdrmdn vortices. A simple vortex-pair model is proposed to estimate velocity perturbation induced by the longitudinal vortices in the near wake region. The perturbation resulting from the longitudinal vortices is shown to induce spanwise velocity modulation and a velocity spike of a nominally two-dimensional vortex street.
AB - This paper presents data showing the three-dimensional vortical structures in the near wake region of circular cylinders. The in-plane velocity field was measured using a digital Particle Image Velocimetry (PIV) technique. The vortical structures are found to include inclined counter-rotating longitudinal vortices in the braids joining consecutive Kdrmdn vortices. A simple vortex-pair model is proposed to estimate velocity perturbation induced by the longitudinal vortices in the near wake region. The perturbation resulting from the longitudinal vortices is shown to induce spanwise velocity modulation and a velocity spike of a nominally two-dimensional vortex street.
UR - http://www.scopus.com/inward/record.url?scp=0030244641&partnerID=8YFLogxK
U2 - 10.1115/1.2817791
DO - 10.1115/1.2817791
M3 - Article
VL - 118
SP - 531
EP - 536
JO - Journal of Fluids Engineering
JF - Journal of Fluids Engineering
SN - 0098-2202
IS - 3
ER -