Belesiotis-Kataras, Panagiotis and Timme, Sebastian 
ORCID: 0000-0002-2409-1686
(2020)
Harmonic Forcing Amplitude Effects in Globally Unstable Transonic Wing Flow.
In: AIAA Scitech 2020 Forum.
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Abstract
Unsteady Reynolds-averaged Navier–Stokes simulations were carried out to investigate the aerodynamic response of a wing when a harmonic sinusoidal structural forcing using a synthetic torsion mode is imposed. Simulations were run for a number of excitation frequencies and amplitude factors. The flow conditions for the half wing-body model scaled to wind tunnel dimensions are a Mach number of 0.8 with a chord Reynolds number of 3.75×106 and angles of attack around onset of shock-buffet flow unsteadiness in the transonic regime. The finite-volume solver DLR–TAU was used for the simulations. The response signal of lift coefficient is analysed and discrete Fourier transformation allows the frequency content to be examined for both pre-onset and buffeting flows. For pre-buffet flow, time-marching non-linear simulation results are in agreement with those of the linearised frequency-domain method, for sufficiently low amplitudes, to give dynamic derivatives. More iterations are required for convergence as the excitation frequency is getting close to the buffet frequency range, pointing towards a weakly-damped dominant modal behaviour. For shock-buffet flow, low amplitude structural excitation appears to have negligible effect on the buffet dynamics while higher amplitude responses follow the harmonic forcing, with frequency content in the buffet range still present.
| Item Type: | Conference or Workshop Item (Unspecified) |
|---|---|
| Depositing User: | Symplectic Admin |
| Date Deposited: | 08 Jan 2020 09:45 |
| Last Modified: | 19 Jan 2023 00:10 |
| DOI: | 10.2514/6.2020-1985 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3069738 |
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