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Wave drag on asymmetric bodies

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arxiv 1902.07574 v1 pith:JVRNKTYX submitted 2019-02-20 physics.flu-dyn

Wave drag on asymmetric bodies

classification physics.flu-dyn
keywords dragwavemichellasymmetricasymmetryedgeeffectstheory
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 1898). 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.

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