Wave drag on asymmetric bodies. (10th November 2019)

• Record Type: Journal Article
• Authors: Benham, G. P.; Boucher, J. P.; Labbé, R.; Benzaquen, M.; Clanet, C.
• Is Part Of: Journal of fluid mechanics. Volume 878(2019)
• Page Start: 147
• Page End: 168
• Publication Date: 2019-11-10
• Subjects: surface gravity waves, -- turbulent boundary layers; Fluid mechanics -- Periodicals; 532.005
• DOI: 10.1017/jfm.2019.638
• Languages: English
• ISSNs: 0022-1120

Abstract

Abstract : An asymmetric body with a sharp leading edge and a rounded trailing edge produces a smaller wave disturbance moving forwards than backwards, and this is reflected in the wave drag coefficient. This experimental fact is not captured by Michell's theory for wave drag (Michell Lond. Edinb. Dubl. Phil. Mag. J. Sci., vol. 45 (272), 1898, pp. 106–123). In this study, we use a tow-tank experiment to investigate the effects of asymmetry on wave drag, and show that these effects can be replicated by modifying Michell's theory to include the growth of a symmetry-breaking boundary layer. We show that asymmetry can have either a positive or a negative effect on drag, depending on the depth of motion and the Froude number.