Aeroelasticity :Turb Lin
A solver for Fluid-Structure Interaction and Aeroelasticity
Fluorem is a spin-off company of the Laboratory of Fluid Mechanics and Acoustic of Ecole Centrale of Lyon (CNRS). It has built its expertise, with more than 20 years of know-how, on the complex problems of Fluid/Structure interactions, flow instabilities and aeroelasticity.
The flutter issue
Up to now, the discrepancies of the results, as from numerical simulations than from experiments, and the absence of aerodynamic rules, are the main issues for industrial companies willing to predict these instabilities. As a consequence, actions are often limited to the structure. The flutter issue is generally associated to:
- Phase lags mechanisms
- Oscillating shock waves
- Fluctuating detachments
- Acoustic waves captation
- Interactions with turbulence
- Coincidence of modes
Studying such complex phenomena requires focusing on physical mechanisms analysis, using adapted turbulence models and developing tools capable to link form and stability.
Fluorem expertise
Fluid-structure coupling, unsteady shockboundary layer interaction, aero-acoustic, unsteadiness, involving :
- study of fluid-structure coupling with imposed mode structure
- comprehension and analysis of flutter issues (fluctuating detachments, acoustic blockage, interaction with turbulence, coincidence of modes)
- analysis of cut off / cut on modes
- acoustic analogy predictions by means of the Advanced-Time Approach (coupled U-RANS/FW-H predictions with statistical modelling of random flow components for broadband noise predictions), and coupled LES/FW-H predictions for wake/body interactions.
Software for aeroelasticity
Development of software likely to reproduce physical mechanisms behind instabilities:
- accounting for the unsteadiness of the flow and the periodic deformation of the structure
- Turb’Flow™ for temporal unsteady simulations
- Turb’Lin™ for frequential linearized simulations
From a given source and a frequency of the excitation, Turb’Lin™ determines the aerodynamic response of the flow, accounting for turbulent mechanisms. The frequential decomposition then enable to focus on the aeroelastic damping factor for stability analysis, as the correlation between the module and the phase of the pressure fluctuations.
