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• W3123404441 abstract "Fluctuating surface pressures on a bluff body exposed to a boundary layer flow generally are characterized as a spatiotemporally varying random field. In this paper, a dynamic mode decomposition (DMD) was applied to extract dominant features embedded in these random pressure fields. Utilizing an unsupervised machine learning algorithm, spatial modes and their temporal variations were grouped into different clusters at scales, e.g., macro, meso, and micro. A proper orthogonal decomposition (POD) of the experimental data was carried out to observe commonalities and distinctive perspectives each decomposition offers. A comprehensive examination of the DMD/POD for their convergence criteria, data sufficiency, and modal components analysis was conducted. The physical interpretation of the spatiotemporal pressure field based on these decomposition schemes was discussed. At different scales, the DMD modes can capture the evolution of aerodynamic features, e.g., convection of vortices (or vortex tubes) and other structures. The distribution of energy among these three broad scales also reflects an energy cascade in pressure fluctuations akin to turbulence." @default.
• W3123404441 created "2021-02-01" @default.
• W3123404441 creator A5069470138 @default.
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• W3123404441 date "2021-04-01" @default.
• W3123404441 modified "2023-10-15" @default.
• W3123404441 title "Dynamic Mode Decomposition of Random Pressure Fields over Bluff Bodies" @default.
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• W3123404441 doi "https://doi.org/10.1061/(asce)em.1943-7889.0001904" @default.
• W3123404441 hasPublicationYear "2021" @default.
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