This paper presents an experimental study of flow over a square cylinder oscillating in transverse direction. The Reynolds number selected for present study is 485. Limited study has also been made for two other Reynolds numbers, namely, 295 and 775. The objective of the present study is to modify the near-wake flow structure using actuation of the cylinder for possible reduction in drag force. Transverse oscillations to the cylinder are provided using electromagnetic actuators. The flow field is investigated using two-dimensional (2D)-particle image velocimetry (PIV) system, hotwire anemometer (HWA), as well as flow visualization techniques. The effect of oscillation frequency and the amplitude on parameters like Strouhal number, drag coefficient, recirculation length, power spectrum, and Reynolds stress are studied. It is observed that the recirculation length is reduced significantly with increase in forcing frequency, and consequently drag coefficient is also reduced. For a constant forcing frequency, the vortex strength is reduced with the increase in the amplitude. Further, variation of instantaneous spanwise vorticity shows that separated shear length decreases with increase in forcing frequency. As a result, vortices are moved closer to the cylinder. These phenomena affect the forces acting on the cylinder. Lock-on is also observed at a frequency close to the vortex shedding frequency of the stationary cylinder.
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Research-Article
Experimental Investigation of Flow Over a Transversely Oscillating Square Cylinder at Intermediate Reynolds Number
Manish Kumar Chauhan,
Manish Kumar Chauhan
Mechanical and
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: manishku.25@gmail.com
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: manishku.25@gmail.com
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Sushanta Dutta,
Sushanta Dutta
Associate Professor
Mem. ASME
Mechanical and
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: duttafme@iitr.ac.in
Mem. ASME
Mechanical and
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: duttafme@iitr.ac.in
Search for other works by this author on:
Bhupendra Kumar Gandhi,
Bhupendra Kumar Gandhi
Professor
Mem. ASME
Mechanical and
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: bkgmefme@iitr.ac.in
Mem. ASME
Mechanical and
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: bkgmefme@iitr.ac.in
Search for other works by this author on:
Bhupendra Singh More
Bhupendra Singh More
Mechanical and
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: bmore812@gmail.com
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: bmore812@gmail.com
Search for other works by this author on:
Manish Kumar Chauhan
Mechanical and
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: manishku.25@gmail.com
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: manishku.25@gmail.com
Sushanta Dutta
Associate Professor
Mem. ASME
Mechanical and
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: duttafme@iitr.ac.in
Mem. ASME
Mechanical and
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: duttafme@iitr.ac.in
Bhupendra Kumar Gandhi
Professor
Mem. ASME
Mechanical and
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: bkgmefme@iitr.ac.in
Mem. ASME
Mechanical and
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: bkgmefme@iitr.ac.in
Bhupendra Singh More
Mechanical and
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: bmore812@gmail.com
Industrial Engineering Department,
Indian Institute of Technology, Roorkee,
Roorkee, Uttarakhand 247667, India
e-mail: bmore812@gmail.com
1Corresponding author.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received April 9, 2015; final manuscript received October 16, 2015; published online January 6, 2016. Assoc. Editor: Peter Vorobieff.
J. Fluids Eng. May 2016, 138(5): 051105 (19 pages)
Published Online: January 6, 2016
Article history
Received:
April 9, 2015
Revised:
October 16, 2015
Citation
Kumar Chauhan, M., Dutta, S., Kumar Gandhi, B., and Singh More, B. (January 6, 2016). "Experimental Investigation of Flow Over a Transversely Oscillating Square Cylinder at Intermediate Reynolds Number." ASME. J. Fluids Eng. May 2016; 138(5): 051105. https://doi.org/10.1115/1.4031878
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