| Author(s): |
Ricciardi, Tulio R.
;
Wolf, William R.
;
Taira, Kunihiko
Total Authors: 3
|
| Document type: | Journal article |
| Source: | AIAA AVIATION 2021 FORUM; v. N/A, p. 10-pg., 2021-01-01. |
| Abstract | |
A wall-resolved large eddy simulation (LES) is performed to study secondary tones generated in a transitional flow over a NACA0012 airfoil. The airfoil angle of attack is set as alpha = 3 degrees and the freestream Mach and Reynolds numbers are M-infinity = 0.3 and R-e = 5 x 10(4), respectively. A laminar separation bubble appears over the airfoil suction side, playing an important role in the flow dynamics. Inspection of flow structures and spectral analysis are employed to investigate vortex shedding aft of the suction side separation bubble. Detailed flow visualization shows that vortex interaction results in intermittent flow patterns with either vortex merging or bursting. As a consequence, coherent structures or turbulent packets advect towards the trailing edge with different levels of noise emission. The coherent structures are identified by high values of two-point pressure correlations along the spanwise direction. Despite the intermittent occurrence of laminar-turbulent transition, the noise spectrum depicts a main tone with multiple equidistant secondary tones. (AU) | |
| FAPESP's process: | 13/08293-7 - CCES - Center for Computational Engineering and Sciences |
| Grantee: | Munir Salomao Skaf |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |
| FAPESP's process: | 19/20437-0 - Strategies of Flow Control via Resolvent Analysis with Applications in Airframe Noise |
| Grantee: | Tulio Rodarte Ricciardi |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 18/11835-0 - Numerical investigation of aircraft landing gear noise |
| Grantee: | Tulio Rodarte Ricciardi |
| Support Opportunities: | Scholarships in Brazil - Doctorate |