Focusing of the Rarefaction Wave \\in a Thin Cavitating Fluid Layer with a Free Boundary
E. S. Zhuravleva, V. K. Kedrinskii
Lavrentyev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia
Keywords: ударная волна, волна разрежения, фокусировка, кавитационный процесс, shock wave, rarefaction wave, focusing, cavitation process
Abstract
A new method of focusing the rarefaction wave in a one-dimensional axisymmetric formulation is proposed. The method is based on shock wave generation initiated by motion of a piston coaxial with the axis of symmetry with a prescribed pulse profile for the maximum velocities of 20 to 100 m/s and the exponent decay constant up to 10 s. It is found that reflection of the shock wave from the free boundary generates a rarefaction wave propagating toward the axis of symmetry with increasing amplitude, and a cavitation zone is formed and developed behind the wave front.
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