TY - GEN
T1 - POD, DMD, and resolvent analysis of transonic airfoil buffet phenomena
AU - Iwatani, Yuta
AU - Asada, Hiroyuki
AU - Kawai, Soshi
N1 - Funding Information:
This work was supported in part by JSPS KAKENHI Grand Number 21H01523. Authors also acknowledge Dr C.-A. Yeh and Dr K. Taira for their help with the code development of the modal analyses.
Publisher Copyright:
© 2022, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2022
Y1 - 2022
N2 - Proper orthogonal decomposition (POD), dynamic mode decomposition (DMD), and resolvent analysis are conducted by using the high fidelity wall-resolved LES data of transonic airfoil buffet phenomena over the supercritical airfoil OAT15A to reveal the mechanism of the selfsustained shock wave oscillations. The POD and the DMD identify dominant flow structures in terms of energy and spatiotemporal flow structures from high-dimensional data, respectively. The resolvent analysis finds correlations between inputs and outputs in complex flows. These modal analyses allow us to elucidate the physically crucial features from the high-dimensional and nonlinear phenomena. As a result, the DMD of the reduced-order model constructed by the dominant POD modes identifies the travel of the large-scale pressure region around the shock wave. Moreover, the resolvent analysis reveals that the travel of the pressure region contributes to the shock wave oscillations.
AB - Proper orthogonal decomposition (POD), dynamic mode decomposition (DMD), and resolvent analysis are conducted by using the high fidelity wall-resolved LES data of transonic airfoil buffet phenomena over the supercritical airfoil OAT15A to reveal the mechanism of the selfsustained shock wave oscillations. The POD and the DMD identify dominant flow structures in terms of energy and spatiotemporal flow structures from high-dimensional data, respectively. The resolvent analysis finds correlations between inputs and outputs in complex flows. These modal analyses allow us to elucidate the physically crucial features from the high-dimensional and nonlinear phenomena. As a result, the DMD of the reduced-order model constructed by the dominant POD modes identifies the travel of the large-scale pressure region around the shock wave. Moreover, the resolvent analysis reveals that the travel of the pressure region contributes to the shock wave oscillations.
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U2 - 10.2514/6.2022-0461
DO - 10.2514/6.2022-0461
M3 - Conference contribution
AN - SCOPUS:85122946768
SN - 9781624106316
T3 - AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022
BT - AIAA SciTech Forum 2022
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022
Y2 - 3 January 2022 through 7 January 2022
ER -