Whistling Potential of an In-Duct Orifice in the Presence of Flow
Application ID: 74041
This model studies a small orifice located in a duct. The transmission and reflection coefficients of the system are computed in the presence of a bias flow using the linearized Navier-Stokes equations. For certain frequencies the transmission coefficient shows amplification (T>1). This is due to the interaction between flow and acoustics where energy is transferred between acoustic and vorticity modes.
Reference: A. Kierkegaard et al. "Simulations of whistling and the whistling potentiality of an in-duct orifice with linear aeroacoustics," J. Sound Vib., 331, pp. 1084-1096 (2012).
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