2018
DOI: 10.15406/jabb.2018.05.00155
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Aero–acoustics in constricted pipe flow at low mach number

Abstract: In this study, the sound generation in a constricted pipe at low Mach number (M=0.003, Re=1170 at the inlet) flow is investigated using a hybrid modeling approach of computational aero-acoustics (CAA). Large Eddy Simulation (LES) model is used simulate the flow and accurately capture the flow instabilities associated with the constriction. The Acoustic Perturbation Equation (APE) method is used to model the acoustic field where the source terms are derived from the incompressible flow simulation results. The a… Show more

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Cited by 1 publication
(2 citation statements)
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“…Hence, POD can provide useful insight into the acoustic sources in the flow. Certain studies have employed POD to study the flow structures and sound sources in similar flow geometries to the current study, which involve constrictions [ 42 , 43 , 44 ]. POD can be explained using Equation (2): where a time-varying quantity, , is represented as a summation of linearly independent (i.e., orthogonal) mode shapes ) multiplied by their time-varying amplitudes .…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…Hence, POD can provide useful insight into the acoustic sources in the flow. Certain studies have employed POD to study the flow structures and sound sources in similar flow geometries to the current study, which involve constrictions [ 42 , 43 , 44 ]. POD can be explained using Equation (2): where a time-varying quantity, , is represented as a summation of linearly independent (i.e., orthogonal) mode shapes ) multiplied by their time-varying amplitudes .…”
Section: Methodsmentioning
confidence: 99%
“…The MathWorks, Inc., Natick, MA, USA). A detailed description of this POD calculation procedure can be found in a previous study [ 44 ]. In the current work, POD was performed for the pressure values in the flow domain solved in the last second of simulation and was recorded with the frequency of every 0.0008 s, corresponding to a Nyquist frequency of 625 Hz.…”
Section: Methodsmentioning
confidence: 99%