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Simulation with single cylindrical pipe structure: (a) physical structure (pipe dimension: l = 117.7 mm and d = 10 mm; window dimension: h = 3 mm and w = 8 mm); (b) sound pressure distribution at 1033.6 Hz; (c) root mean square (RMS) sound intensity streamline at 1033.6 Hz; and (d) RMS sound intensity streamline at 22,007 Hz.
