3D cases, non-structured meshes up to 1300000 nodes, performed in IMM RAS by A. Gorobets, I. Abalakin and T. Kozubskaya on MVS 100000 supercomputer of MSC RAS, 2007. Flat low-frequency acoustic wave enters a circular impedance tube with a resonator chamber. Phenomena of transition of the acoustic energy into energy of turbulent motion was investigated. Turbulent flow appears when the wave interacts with the resonator's mouth.
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