Abstract
A solver based on rigid moving mesh and DDES techniques is implemented to investigate the unsteady flows around an 80°/65°double delta wing during a sinusoidal pitching motion with reduced frequency equal to 0.4. We focus on the behavior of burst point, helical mode instability, pressure fluctuations and dynamic pitching stability. The response of burst point is nearly a simple harmonic motion and locked in the frequency of pitching motion associated with a phase lag. The time-averaged flow after breakdown regions is still approximately a conical flow, whose cone angle is different from the steady state. Cm lags behind with the variation of incidence, which means dynamic pitching stability is obtained.
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Acknowledgements
The investigations presented in this paper were supported by the National Natural Science Foundation of China (Grant No. 11372159), the National Key Technologies R&D Program of China (Grant No. 2016YFA0401200) and the European Union Horizon2020 Research and Innovation Program IMAGE (Grant No 688971). The authors also thank Tsinghua National Laboratory for Information Science and Technology for providing computational resources.
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Liu, J., Sun, H., Xiao, Z. (2018). Vortex Breakdown Flows Around a Double-Delta Wing During Pitching Motion Based on DDES. In: Hoarau, Y., Peng, SH., Schwamborn, D., Revell, A. (eds) Progress in Hybrid RANS-LES Modelling. HRLM 2016. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 137. Springer, Cham. https://doi.org/10.1007/978-3-319-70031-1_26
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DOI: https://doi.org/10.1007/978-3-319-70031-1_26
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