6. Physics of a Fluid, Neutral and Ionized Gases

APPLICATION OF HILBERT-HUANG TRANSFORM FOR ANALYZING OF FLUCTUATIONS BEHIND CIRCULAR CYLINDER

Dmitriy S. Mironov
1. Khristianovich Institute of Theoretical and Applied Mechanics SB RAS 4/1 Institutskaya Str., Novosibirsk, 630090, Russian Federation
mdsdaimond@gmail.com
Vadim A. Lebiga
1. Khristianovich Institute of Theoretical and Applied Mechanics SB RAS Novosibirsk, Russian Federation
2. Novosibirsk State Technical University Novosibirsk, Russian Federation
lebiga@itam.nsc.ru
Miau Jiun-Jih
1. National Chen-Gong University 1 Universitet Ave., Tainan, 70101, Taiwan
The material was received by the Editorial Board: 27.07.2017
One of the most important goals of experimental gas dynamics is to study formation and evolution of fluctuations generated by flow over some obstacles. Such fluctuations are mostly nonstationary. To analyze such experimental data time-frequency techniques are required in order to provide not only mean value of frequencies and corresponding amplitudes in whole signal but also temporal variation of frequency and amplitude of specific process. Hilbert-Huang transform is one of such techniques. Abilities of the method are presented in this paper. Fluctuations of velocity behind a circular cylinder are analyzed at sub-critical Reynolds number.

Keywords:
subsonic flow, cylinder, joint time-frequency data analyzing techniques, Fourier transform, wavelet transform, Hilbert-Huang transform. 
УДК 533.6

APPLICATION OF HILBERT-HUANG TRANSFORM FOR ANALYZING OF FLUCTUATIONS BEHIND CIRCULAR CYLINDER
References: Mironov D. S., Lebiga V. A., Miau J. J., Pak A. Yu., Zinoviev V. N. APPLICATION OF HILBERT-HUANG TRANSFORM FOR ANALYZING OF FLUCTUATIONS BEHIND CIRCULAR CYLINDER. Siberian Journal of Physics . 2017, vol. 12, no. 3. P. 49–59. (in Russ.). DOI: 10.25205/2541-9447-2017-12-3-49-59