Abstract
Streak instability and subsequent breakdown caused by disturbances whose frequency-spectrum was similar to that of wall turbulence were examined experimentally. A low-speed streak was generated by using a small piece of wire-gauze-screen and disturbances were introduced to excite the streak instability through two small holes behind the screen. Two kinds of turbulent signals having different spanwise coherency were considered. Occurrence and growth of sinuous instability mode were compared with those for anti-symmetric forcing with the same frequency-spectrum. The results showed that the occurrence of sinuous instability mode was dependent on the spanwise coherency of the forcing disturbance.
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Acknowledgments
This work was, in part, supported by Grant for Scientific Research from Tokyo Metropolitan Government.
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© 2016 Springer International Publishing Switzerland
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Ho, H.Q., Asai, M., Takagi, S. (2016). Breakdown of a Low-Speed Streak Caused by Turbulent Fluctuations. In: Segalini, A. (eds) Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015). Springer Proceedings in Physics, vol 185. Springer, Cham. https://doi.org/10.1007/978-3-319-30602-5_38
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DOI: https://doi.org/10.1007/978-3-319-30602-5_38
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