Abstract
Experimental results are presented on the waviness of the wall-shear stress field of a two-dimensional transitional boundary layer in a zero-pressure gradient flow channel. Arrays of flexible micro-pillars are used as a dense grid of sensors to measure the surface distribution of tangential vorticity (longitudinal and transverse component) over time. The results show a quasi-periodic passage of varicose wave-like disturbances with strong anti-correlation of the transverse component. These are related to packets of 3-4 vortex loops representing the near-wall state of secondary varicose instability of the streaks.
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© 2009 Springer-Verlag Berlin Heidelberg
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Brücker, C. (2009). Signature of Varicose Wave Packets in the Viscous Sublayer. In: Peinke, J., Oberlack, M., Talamelli, A. (eds) Progress in Turbulence III. Springer Proceedings in Physics, vol 131. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02225-8_49
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DOI: https://doi.org/10.1007/978-3-642-02225-8_49
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-02224-1
Online ISBN: 978-3-642-02225-8
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