Identifying the Self-Sustaining Mechanisms of Transonic Airfoil Buffet with Resolvent Analysis
Abstract
The self-sustaining mechanisms of shock oscillations in transonic airfoil buffet are studied by wall-resolved large-eddy simulation (LES) and resolvent analysis. The LES successfully reproduces the large-scale shock oscillations over a transonic OAT15A airfoil, and the resolvent analysis using the high-fidelity LES data reveals the input–output relations in the self-sustained shock oscillations. Based on the input–output relations revealed by the resolvent analysis, this study identifies two mechanisms of the self-sustained shock oscillations. The first mechanism is closely tied to the periodic variations of the shock-induced separation height, whereas the second mechanism is related to the pressure dynamics around the shock wave. The mechanisms of the self-sustained shock oscillations identified by the input–output relations are examined in detail along with the high-fidelity LES data to aid the understanding of the feedback formulations in transonic airfoil buffet.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 01, 2023
- Source ID
- 10.2514/1.j062294
Entities
People
- C. Yeh
- Hiroyuki Asada
- Kunihiko Taira
- Soshi Kawai
- Yuta Iwatani
Organizations
- Army Research Office
- Japan Society for the Promotion of Science
- North Carolina State University
- Tohoku University
- University of California, Los Angeles