Model-based estimation of vortex shedding in unsteady cylinder wakes Article Swipe
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· 2020
· Open Access
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· DOI: https://doi.org/10.1103/physrevfluids.5.023901
· OA: W2942936084
This paper considers single-sensor estimation of vortex shedding in cylinder\nwakes at $Re=100$ in simulations and at $Re=1036$ in experiments. A model based\non harmonic decomposition is developed to capture the periodic dynamics of\nvortex shedding. Two model-based methods are proposed to estimate time-resolved\nflow fields. First, Linear Estimation (LE) which implements a Kalman Filter to\nestimate the flow. Second, Linear-Trigonometric Estimation (LTE), which\nutilizes the same Kalman Filter together with a nonlinear relationship between\nharmonics of the vortex shedding frequency. LTE shows good performance and\noutperforms LE regarding the reconstruction of vortex shedding. Physically this\nsuggests that, at the Reynolds numbers considered, the higher harmonic motions\nin the cylinder wake are slave to the fundamental frequency.\n
