Wavelet multiresolution signal decomposition on turbulent wakes generated by an inclined cylinder

Siti Fatin Mohd Razali, T. Zhou, L. Cheng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Three-dimensional velocity in the wake of a stationary circular cylinder inclined at an angle α in the rauge of 0°-45° are analysed using the wavelet multiresolution technique. This study aims to examine the dependence of the velocity at different wavelet levels on α. The validity of the Independence Principle (IP) for vortex shedding was also examined. It was found that the peak frequency of energy spectra has the smallest variation among different inclination angles at wavelet level 6: which corresponds to the frequency band of Kármán vortex shedding. The deviation of peak frequency from the IP at α = 45° is much larger than the experimental uncertainty, which may indicate that the IP is only applicable for α < 45°. The energy spectra are very weak at wavelet levels that represent intermediate and small scale structures while they are strong at wavelet levels 6-8 which represent the large scale structures.

Original languageEnglish
Title of host publicationProceedings of the 5th International Conference on Asian and Pacific Coasts, APAC 2009
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages252-258
Number of pages7
Volume2
ISBN (Print)9814287970, 9789814287975
Publication statusPublished - 2010
Externally publishedYes
Event5th International Conference on Asian and Pacific Coasts, APAC 2009 - Singapore
Duration: 13 Oct 200916 Oct 2009

Other

Other5th International Conference on Asian and Pacific Coasts, APAC 2009
CitySingapore
Period13/10/0916/10/09

Fingerprint

Vortex shedding
Decomposition
Circular cylinders
Frequency bands
Uncertainty

ASJC Scopus subject areas

  • Ocean Engineering

Cite this

Mohd Razali, S. F., Zhou, T., & Cheng, L. (2010). Wavelet multiresolution signal decomposition on turbulent wakes generated by an inclined cylinder. In Proceedings of the 5th International Conference on Asian and Pacific Coasts, APAC 2009 (Vol. 2, pp. 252-258). World Scientific Publishing Co. Pte Ltd.

Wavelet multiresolution signal decomposition on turbulent wakes generated by an inclined cylinder. / Mohd Razali, Siti Fatin; Zhou, T.; Cheng, L.

Proceedings of the 5th International Conference on Asian and Pacific Coasts, APAC 2009. Vol. 2 World Scientific Publishing Co. Pte Ltd, 2010. p. 252-258.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Mohd Razali, SF, Zhou, T & Cheng, L 2010, Wavelet multiresolution signal decomposition on turbulent wakes generated by an inclined cylinder. in Proceedings of the 5th International Conference on Asian and Pacific Coasts, APAC 2009. vol. 2, World Scientific Publishing Co. Pte Ltd, pp. 252-258, 5th International Conference on Asian and Pacific Coasts, APAC 2009, Singapore, 13/10/09.
Mohd Razali SF, Zhou T, Cheng L. Wavelet multiresolution signal decomposition on turbulent wakes generated by an inclined cylinder. In Proceedings of the 5th International Conference on Asian and Pacific Coasts, APAC 2009. Vol. 2. World Scientific Publishing Co. Pte Ltd. 2010. p. 252-258
Mohd Razali, Siti Fatin ; Zhou, T. ; Cheng, L. / Wavelet multiresolution signal decomposition on turbulent wakes generated by an inclined cylinder. Proceedings of the 5th International Conference on Asian and Pacific Coasts, APAC 2009. Vol. 2 World Scientific Publishing Co. Pte Ltd, 2010. pp. 252-258
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