Imperial College London
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Dr. Oliver Buxton

Faculty of Engineering, Department of Aeronautics

Reader in Experimental Fluid Mechanics
 
 
 
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Contact

 

+44 (0)20 7594 5118o.buxton Website CV

 
 
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Location

 

213City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Cicolin:2021:10.1017/jfm.2021.64,
author = {Cicolin, M and Buxton, O and Assi, G and Bearman, P},
doi = {10.1017/jfm.2021.64},
journal = {Journal of Fluid Mechanics},
pages = {1--29},
title = {The role of separation on the forces acting on a circular cylinder with a control rod},
url = {http://dx.doi.org/10.1017/jfm.2021.64},
volume = {915},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The development of the flow around a circular cylinder with a smaller diameter control rod  in  close  proximity  is  the  subject  of  this  paper.  It  has  long  been  known  that  this is  an  effective  way  to  attenuate  regular  vortex  shedding  leading  to  reductions  in  its adverse effects on bluff body flow. The aim of this study is to improve understanding of  the  ways  the  control  rod  affects  the  near  wake  flow  including  how  it  influences  the positions of boundary layer separation. Experiments were carried out in a water channel to measure lift and drag forces and PIV was employed to obtain detailed information on flow structure. The values of important properties were fixed as follows: Reynolds number20,000; ratio of cylinder and control rod diameters 10:1; centre to centre distance between main cylinder and control rod 0.7D, where Dis main cylinder diameter. The adjustable parameter was the angular position of the rod,θ, which was varied between 90and 180from the front stagnation line. Lift and drag forces were measured separately for the main cylinder and the control rod. A new method for identifying flow states is introduced using PIV to interrogate the instantaneous flow velocity in the gap between the main cylinder and the control rod. Similarly to previous studies, three stable flow states were observed together with a bi-stable state. The bi-stable state is very sensitive to the control rod angle with a small change of±1being sufficient to change the flow state.
AU  - Cicolin,M
AU  - Buxton,O
AU  - Assi,G
AU  - Bearman,P
DO  - 10.1017/jfm.2021.64
EP  - 29
PY  - 2021///
SN  - 0022-1120
SP  - 1
TI  - The role of separation on the forces acting on a circular cylinder with a control rod
T2  - Journal of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/jfm.2021.64
UR  - https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/role-of-separation-on-the-forces-acting-on-a-circular-cylinder-with-a-control-rod/09B6AB7E9160A77CBF0B03EDA523C96E
UR  - http://hdl.handle.net/10044/1/86501
VL  - 915
ER  -
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