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Abstract. The receptivity due to the interaction of an acoustic wave with a body which has a rounded leading edge and a region of low wall shear is considered. The body of interest is formed by a line source in a uniform stream. The nose radius, r * n , of this body is characterised in the theory through a parameter A = 2ω r * n /3U∞ where ω is the frequency of the acoustic wave and U∞ the mean flow speed. By comparing asymptotic and numerical results, the receptivity coefficient, C1, is calculated. The receptivity coefficient is seen to decrease dramatically with a small increase in nose radius, a local rise occurs about A = 0.035 and it then gradually declines to nearly zero when A = 0.1.

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