Abstract
A recent investigation revealed that a low frequency peak in premultiplied energy spectra due to turbulent patch passes in a transitional channel flow continues in a low Reynolds number but turbulent flow. In this study, to denial that a peculiar vibration of the facilities causes this low frequency peak, hot-wire measurements were performed. Spectral energy distributions obtained in different air channel flow facilities clearly confirm very large-scale feature at low Reynolds number and its independence from peculiarities of the facilities. A flow visualization experiment conducted in a water channel illustrates that a cluster of characteristic streaks forms into a inclined stripe whose shape is similar to a turbulent patch in a transitional channel flow. The streamwise and spanwise sizes of the cluster are in agreement with length scales estimated from the energy spectral and a spanwise correlation of the streamwise velocity. The similarity to the turbulent patch and continuity of the low-frequency peak from the transitional Reynolds number infer that the very large-scale feature relates to the intermittency in the transitional flow in terms of its maintenance and occurrence mechanism.
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Horii, S., Sagawa, Y., Miyazaki, M., Matsubara, M. (2017). Very Large-Scale Feature of Transitional and Turbulent Channel Flows: Dependence on Facilities. In: Örlü, R., Talamelli, A., Oberlack, M., Peinke, J. (eds) Progress in Turbulence VII. Springer Proceedings in Physics, vol 196. Springer, Cham. https://doi.org/10.1007/978-3-319-57934-4_27
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DOI: https://doi.org/10.1007/978-3-319-57934-4_27
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Online ISBN: 978-3-319-57934-4
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