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Article

Design-Assisted of Pitching Aerofoils through Enhanced Identification of Coherent Flow Structures

1
Department of Industrial Engineering, Università degli Studi di Padova, via Venezia 1, 35131 Padova, Italy
2
Lehrstuhl für Hubschraubertechnologie, Technische Universität München, Boltzmannstr. 15, 85748 Garching, Germany
*
Author to whom correspondence should be addressed.
Received: 30 December 2020 / Revised: 21 January 2021 / Accepted: 8 February 2021 / Published: 14 February 2021
(This article belongs to the Special Issue Air Vehicle Design: Environment, Innovations and Disruption)
This study discusses a general framework to identify the unsteady features of a flow past an oscillating aerofoil in deep dynamic stall conditions. In particular, the work aims at demonstrating the advantages for the design process of the Spectral Proper Orthogonal Decomposition in accurately producing reliable reduced models of CFD systems and comparing this technique with standard snapshot-based models. Reynolds-Averaged Navier-Stokes system of equations, coupled with kω SST turbulence model, is used to produce the dataset, the latter consisting of a two-dimensional NACA 0012 aerofoil in the pitching motion. Modal analysis is performed on both velocity and pressure fields showing that, for vectored values, a proper tuning of the filtering process allows for better results compared to snapshot formulations and extract highly correlated coherent flow structures otherwise undetected. Wider filters, in particular, produce enhanced coherence without affecting the typical frequency response of the coupled modes. Conversely, the pressure field decomposition is drastically affected by the windowing properties. In conclusion, the low-order spectral reconstruction of the pressure field allows for an excellent prediction of aerodynamic loads. Moreover, the analysis shows that snapshot-based models better perform on the CFD values during the pitching cycle, while spectral-based methods better fit the loads’ fluctuations. View Full-Text
Keywords: dynamic stall; pitching; spectral POD; coherent structures; modal analysis dynamic stall; pitching; spectral POD; coherent structures; modal analysis
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MDPI and ACS Style

Avanzi, F.; De Vanna, F.; Ruan, Y.; Benini, E. Design-Assisted of Pitching Aerofoils through Enhanced Identification of Coherent Flow Structures. Designs 2021, 5, 11. https://0-doi-org.brum.beds.ac.uk/10.3390/designs5010011

AMA Style

Avanzi F, De Vanna F, Ruan Y, Benini E. Design-Assisted of Pitching Aerofoils through Enhanced Identification of Coherent Flow Structures. Designs. 2021; 5(1):11. https://0-doi-org.brum.beds.ac.uk/10.3390/designs5010011

Chicago/Turabian Style

Avanzi, Filippo, Francesco De Vanna, Yin Ruan, and Ernesto Benini. 2021. "Design-Assisted of Pitching Aerofoils through Enhanced Identification of Coherent Flow Structures" Designs 5, no. 1: 11. https://0-doi-org.brum.beds.ac.uk/10.3390/designs5010011

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