Abstract
Large eddy simulations have been conducted to gain further insight into the drag-reducing mechanisms of riblets in zero-pressure gradient turbulent boundary layer. The retained groove geometry achieves 9.8 % drag reduction on the controlled zone developing from \(Re_{\theta } = 670\) to 975. It is shown that the turbulent contribution to the drag—as defined by Fukagata et al. Phys. Fluids, 14(11):L73, 2002 [7]—is the most affected. In the light of the obtained results, energy and enstrophy budgets will finally conduct to isolate a key mechanism involved in the riblets drag reduction.
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Acknowledgments
This work was granted access to the HPC resources from IDRIS under the allocation 2014-100392 made by the GENCI. The thesis of Amaury Bannier is partly funded by Ecole Polytechnique.
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Bannier, A., Garnier, E., Sagaut, P. (2016). Riblets Induced Drag Reduction on a Spatially Developing Turbulent Boundary Layer. In: Stanislas, M., Jimenez, J., Marusic, I. (eds) Progress in Wall Turbulence 2. ERCOFTAC Series, vol 23. Springer, Cham. https://doi.org/10.1007/978-3-319-20388-1_19
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DOI: https://doi.org/10.1007/978-3-319-20388-1_19
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