Dynamic roughness perturbation of a turbulent boundary layer
نویسندگان
چکیده
منابع مشابه
Dynamic roughness perturbation of a turbulent boundary layer
The zero-pressure-gradient turbulent boundary layer over a flat plate was perturbed by a temporally oscillating, spatial impulse of roughness, and the downstream response of the flow field was interrogated by hot-wire anemometry and particleimage velocimetry. The key features common to impulsively perturbed boundary layers, as identified in Jacobi & McKeon (J. Fluid Mech., 2011), were investiga...
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The ubiquity of wall-bounded flows in nature and industry make the potential impact of artificial manipulation as enticing as the academic challenges that it presents. It is clear that large gains in terms of both understanding of fluid physics and vehicular efficiency are theoretically possible, at least in flows where large amplification of input disturbances is possible. Equally it is assume...
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The zero-pressure-gradient turbulent boundary layer over a flat plate was perturbed by a short strip of two-dimensional roughness elements, and the downstream response of the flow field was interrogated by hot-wire anemometry and particle image velocimetry. Two internal layers, marking the two transitions between rough and smooth boundary conditions, are shown to represent the edges of a ‘stres...
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Statistical and spectral analyses of the manipulation of a canonical zero pressure gradient turbulent boundary layer using static roughness and low-frequency dynamic roughness patches are presented. A shift of spectral energy away from the wall downstream of the roughness patch is observed. The dynamic roughness is shown to disrupt the structure of the boundary layer, while embedding its period...
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S. E. BELCHER, N. JERRAM and J. C. R. HUNT Journal of Fluid Mechanics / Volume 488 / July 2003, pp 369 398 DOI: 10.1017/S0022112003005019, Published online: 02 July 2003 Link to this article: http://journals.cambridge.org/abstract_S0022112003005019 How to cite this article: S. E. BELCHER, N. JERRAM and J. C. R. HUNT (2003). Adjustment of a turbulent boundary layer to a canopy of roughness ele...
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ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2011
ISSN: 0022-1120,1469-7645
DOI: 10.1017/jfm.2011.375