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Investigating wake structures in flow past oscillating cylinder using proper orthogonal decomposition

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Abstract

The present study investigates unsteady wake dynamics in flow past an oscillating cylinder. A two-dimensional computational analysis is undertaken for flow past a sinusoidally oscillating cylinder. Operating parameters like Reynolds number, forcing frequency, amplitude, and wavelength are systematically varied, and their effect on wake dynamics is investigated. Lift and drag coefficients are plotted with cylinder position to characterize the flow. The flow field is analyzed using Proper Orthogonal Decomposition (POD). POD mode shapes and Power Spectral Density (PSD) plots characterize the flow response to cylinder oscillations. The effect of frequency ratio is examined in achieving synchronized vortex shedding. Previous studies focus on two extremes- the cylinder is either stationary or oscillating with perfect phase-locking. Flow past an oscillating cylinder where Karman and forcing frequencies compete for dominance is rarely reported. This paper considers such a scenario and demonstrates how POD can identify coherent structures, their significance, and associated frequencies. Further, non-symmetric vortex shedding, which is not a common observation, is captured and discussed. Large amplitude and large wavelength regimes are investigated, which remained unexplored in previous research. Coherent structures associated with those regimes are identified.

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Acknowledgments

The authors gratefully acknowledge the support provided by the Science and Engineering Research Board (SERB), Government of India, through their Start-up Research Grant scheme.

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Correspondence to Anubhav Sinha.

Appendix A

Appendix A

See figures 10, 11, 12 and 13.

Figure 10
figure 10

Modal energy distribution using different number of snapshots.

Figure 11
figure 11

Modal energies of POD modes for all cases.

Figure 12
figure 12

Schematic of various regimes, adapted from Williamson and Roshko [4].

Figure 13
figure 13

Regime map for flow past oscillating cylinder (larger domain), adapted from Williamson and Roshko [4].

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Parasuram, I.V.L.N., Sinha, A. Investigating wake structures in flow past oscillating cylinder using proper orthogonal decomposition. Sādhanā 49, 79 (2024). https://doi.org/10.1007/s12046-023-02348-0

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