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Suppression of vortex-induced vibration of a square cylinder via continuous twisting at moderate Reynolds numbers

Suppression of vortex-induced vibration of a square cylinder via continuous twisting at moderate Reynolds numbers
Suppression of vortex-induced vibration of a square cylinder via continuous twisting at moderate Reynolds numbers

Vortex-induced vibration (VIV) of elastic structures with a square-shaped prismatic column exposed to flow has a significant impact on many aspects of structural design and stability. The main aim of the present numerical study is to investigate an alternative design of square column for minimizing the impact of VIV on the elastic structures. The numerical study is carried out at moderate Reynolds numbers (1000 ≤ Re ≤ 22000). For both stationary and freely vibrating square cylinders, a systematic validation of the numerical results is performed with the available experimental data. In particular, various turbulence models are explored to assess their effectiveness to capture the separated wake flow dynamics behind the square cylinder. The simulation results via k−ω SST-SAS (Scale Adaptive Simulation) model are found closer to the reported measurements for both stationary and vibrating cases. After establishing the validity of our numerical methodology, the VIV simulations of twisted square cylinders with different twisted angles are performed at the moderate Reynolds numbers. In comparison to the square cylinder counterpart, the results of the twisted square cylinder demonstrate good controlling effect on the VIV response at two oncoming flow directions (0° and 45°). The twisted surface of the cylinder causes the variation of separation or vortex shedding points as well as the frequency of vortex shedding, which in turn affect the distributions of hydrodynamic forces along the cylinder. The power spectral analysis of hydrodynamic forces of twisted square cylinder indicates that the twisted surface has a significant influence on the frequencies of both drag and lift forces. Finally, comparisons of the detailed flow patterns, the 3D vortex structures and the vortex-shedding modes between square and twisted cylinders are presented in detail.

3D vortex structures, Frequency lock-in, Twisted column, Vortex-induced vibration
0167-6105
136-154
Wu, Chih Hua
d0fd67e5-c517-4690-b53c-fffa9cd05f92
Ma, Shengwei
463593d3-f38b-4b3d-953e-eb5df2af744e
Kang, Chang Wei
e6a0e2bc-9b34-41f9-964e-5de006480dee
Arthur Lim, Teck Bin
13646ef9-dcd9-4fa5-bb8d-fddcbb221cf0
Jaiman, Rajeev Kumar
1d6c4210-2608-4f74-afe8-e8dd09cc7482
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Tutty, Owen
c9ba0b98-4790-4a72-b5b7-09c1c6e20375
Wu, Chih Hua
d0fd67e5-c517-4690-b53c-fffa9cd05f92
Ma, Shengwei
463593d3-f38b-4b3d-953e-eb5df2af744e
Kang, Chang Wei
e6a0e2bc-9b34-41f9-964e-5de006480dee
Arthur Lim, Teck Bin
13646ef9-dcd9-4fa5-bb8d-fddcbb221cf0
Jaiman, Rajeev Kumar
1d6c4210-2608-4f74-afe8-e8dd09cc7482
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Tutty, Owen
c9ba0b98-4790-4a72-b5b7-09c1c6e20375

Wu, Chih Hua, Ma, Shengwei, Kang, Chang Wei, Arthur Lim, Teck Bin, Jaiman, Rajeev Kumar, Weymouth, Gabriel and Tutty, Owen (2018) Suppression of vortex-induced vibration of a square cylinder via continuous twisting at moderate Reynolds numbers. Journal of Wind Engineering and Industrial Aerodynamics, 177, 136-154. (doi:10.1016/j.jweia.2018.03.030).

Record type: Article

Abstract

Vortex-induced vibration (VIV) of elastic structures with a square-shaped prismatic column exposed to flow has a significant impact on many aspects of structural design and stability. The main aim of the present numerical study is to investigate an alternative design of square column for minimizing the impact of VIV on the elastic structures. The numerical study is carried out at moderate Reynolds numbers (1000 ≤ Re ≤ 22000). For both stationary and freely vibrating square cylinders, a systematic validation of the numerical results is performed with the available experimental data. In particular, various turbulence models are explored to assess their effectiveness to capture the separated wake flow dynamics behind the square cylinder. The simulation results via k−ω SST-SAS (Scale Adaptive Simulation) model are found closer to the reported measurements for both stationary and vibrating cases. After establishing the validity of our numerical methodology, the VIV simulations of twisted square cylinders with different twisted angles are performed at the moderate Reynolds numbers. In comparison to the square cylinder counterpart, the results of the twisted square cylinder demonstrate good controlling effect on the VIV response at two oncoming flow directions (0° and 45°). The twisted surface of the cylinder causes the variation of separation or vortex shedding points as well as the frequency of vortex shedding, which in turn affect the distributions of hydrodynamic forces along the cylinder. The power spectral analysis of hydrodynamic forces of twisted square cylinder indicates that the twisted surface has a significant influence on the frequencies of both drag and lift forces. Finally, comparisons of the detailed flow patterns, the 3D vortex structures and the vortex-shedding modes between square and twisted cylinders are presented in detail.

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More information

Accepted/In Press date: 26 March 2018
e-pub ahead of print date: 24 April 2018
Published date: 1 June 2018
Keywords: 3D vortex structures, Frequency lock-in, Twisted column, Vortex-induced vibration

Identifiers

Local EPrints ID: 422776
URI: http://eprints.soton.ac.uk/id/eprint/422776
ISSN: 0167-6105
PURE UUID: 832ff8fa-30bd-4f6a-841a-794f160cff8f
ORCID for Gabriel Weymouth: ORCID iD orcid.org/0000-0001-5080-5016

Catalogue record

Date deposited: 03 Aug 2018 16:31
Last modified: 17 Dec 2019 01:36

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Contributors

Author: Chih Hua Wu
Author: Shengwei Ma
Author: Chang Wei Kang
Author: Teck Bin Arthur Lim
Author: Rajeev Kumar Jaiman
Author: Owen Tutty

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