Abstract
Recent developments in turbulent drag-reduction research using riblets, spanwisewall oscillation and compliant coating are sketched here together with some experimental results. Views on drag reduction mechanisms are then given using the evidence derived from these experimental results. In all cases being studied here, only the surface boundary conditions of turbulent boundary layers were change by the devices. Consequently, the manipulation of the boundary layer was conducted through a modification of the near-wall turbulence structure. Indeed, it was found that an effective modification of counter-rotating longitudinal vortices is a key to the successful strategy for turbulent drag reduction. The strength of near-wall vortices was reduced by these devices to give rise to weaker burst events, leading to reductions in turbulent wall-skin friction.
The work was supported by EPSRC Research Grants (GR/J06917, GR/J16114, GR/K38328, GR/K82734, and GR/L90989) and EPSRC Visiting Research Fellowship Grants (GR/J77184, GR/J95317 and GR/K27780). The support from the Leverhulme Trust (RF&G/10988) is also acknowledged.
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Choi, KS. (2001). Turbulent Drag-Reduction Mechanisms: Strategies for Turbulence Management. In: Soldati, A., Monti, R. (eds) Turbulence Structure and Modulation. International Centre for Mechanical Sciences, vol 415. Springer, Vienna. https://doi.org/10.1007/978-3-7091-2574-8_6
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