On Wake Analysis of Flow Past Rotating Downstream Cylinder using Hilbert-Huang Transformation

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Neeraj Paul m.; TIWARI S.

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Paper Information

Journal: JOURNAL OF APPLIED FLUID MECHANICS (JAFM) Year:2019 | Volume:12 | Issue:1 Page(s): 175-186

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Title

On Wake Analysis of Flow Past Rotating Downstream Cylinder using Hilbert-Huang Transformation

Author(s)

Neeraj Paul m. | TIWARI S. | Issue Writer Certificate

Keywords

Rotating downstream circular cylinder

Flow transition

spectral analysis

Hilbert-Huang transformation

Abstract

Two-dimensional numerical simulations have been carried out on flow past two inline circular cylinders with rotating downstream cylinder. Computations are performed for fixed Reynolds number equal to 150 such that the resulting flow field remains laminar and two-dimensional. The inter-cylinder spacing has been chosen equal to 5d ('d' being diameter of cylinder) such that the wake flow is predominantly unsteady. Rotational speed of the downstream cylinder has been varied to investigate its effect on transition in characteristics of temporal wake. This has been achieved by performing Hilbert-Huang transformation (HHT) on time series signals of drag and lift coefficients for the rotating cylinder. Unsteady periodic, unsteady non-periodic and steady transitions in flow behavior have been observed with an increase of rotational speed. Results are presented in the form of vorticity contours, Hilbert spectra and marginal spectra. Degree of stationarity of the signals as measure of nonlinearity has also been quantified. Comparisons are drawn against results from Fourier analysis and it has been shown that HHT is better suited to capture inter-wave and intra-wave modulations indicating nonlinear interactions in the wake.

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APA: Copy

Neeraj Paul, m., & TIWARI, S.. (2019). On Wake Analysis of Flow Past Rotating Downstream Cylinder using Hilbert-Huang Transformation. JOURNAL OF APPLIED FLUID MECHANICS (JAFM), 12(1), 175-186. SID. https://sid.ir/paper/307865/en

Vancouver: Copy

Neeraj Paul m., TIWARI S.. On Wake Analysis of Flow Past Rotating Downstream Cylinder using Hilbert-Huang Transformation. JOURNAL OF APPLIED FLUID MECHANICS (JAFM)[Internet]. 2019;12(1):175-186. Available from: https://sid.ir/paper/307865/en

IEEE: Copy

m. Neeraj Paul, and S. TIWARI, “On Wake Analysis of Flow Past Rotating Downstream Cylinder using Hilbert-Huang Transformation,” JOURNAL OF APPLIED FLUID MECHANICS (JAFM), vol. 12, no. 1, pp. 175–186, 2019, [Online]. Available: https://sid.ir/paper/307865/en

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