Effect of viscosity of the wave process in a nonuniform flow with a critical level

A continuous analytical representation of an acoustic-gravitational field in a medium with a nonuniform flow in the presence of a critical layer is constructed. It is shown that taking into account the effect of viscosity eliminates singular values of the field. St. Petersburg State University, St. Petersburg 198904. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 41, No. 2, pp. 97–101, March–April, 2000.