Towards Unsteady Approach For Future Flutter Calculations
Résumé
In prior work to define an improved hydrodynamic approach to flutter calculations, Centrale Nantes, Bureau Veritas Marine & Offshore and Farr Yacht design investigated the possibility of defining a linearized unsteady hydrodynamic model using a fluid response database coming from a series of 2D unsteady RANSE computations. The approach is compared to the Theodorsen theory. The linearized hydrodynamic model was used in a strip theory model for frequency domain flutter analysis. In this latest work, the IMOCA 2006 keel which has been used previously in frequential domain flutter calculation is also analyzed using an alternative and more accurate solution, featuring a fully coupled FSI modal approach with CFD. As described in the literature, the results present a large impact of the unsteadiness on the phase and module for both lift and moment with a fairly good match compared to Theodorsen theory. The implementation of the results on a frequency domain flutter analysis tool reduces the critical speed for the studied model. Thus the results are closer to the 3D modal CFD approach which gave an lower critical speed.
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