Abstract
Astudy was carried out with an aim to better understand the drag reducing mechanisms by spanwise oscillation and spanwise travelling wave via Lorentz forcing flow control. A maximum 47% of drag reduction was achieved with w + ≈ 12.2 when the Lorentz forcing spanwise oscillation was applied in a turbulent boundary layer. It was, however, shown that the spanwise travelling wave forcing can reduce or increase the skin friction drag depending on the operating conditions, which offers a flexibility for flow control. A maximum 28.9% of drag reduction and 22.8% of drag increase have been achieved, respectively. Flow visualization indicated that the spanwise displacement of the streaky structures may play an important role in obtaining the drag reduction by spanwise travelling wave actuation.
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Xu, P., Choi, KS. (2008). Boundary Layer Control for Drag Reduction by Lorentz Forcing. In: Morrison, J.F., Birch, D.M., Lavoie, P. (eds) IUTAM Symposium on Flow Control and MEMS. IUTAM Bookseries, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6858-4_31
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DOI: https://doi.org/10.1007/978-1-4020-6858-4_31
Publisher Name: Springer, Dordrecht
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