A Numerical Methodology for Resolving Aeroacoustic-Structural Response of Flexible Panel

Leung, R. C. K.; Fan, Harris K. H.; Lam, Garret C. Y.

doi:10.1007/978-3-319-09713-8_15

Cited by 2 publications

(4 citation statements)

References 18 publications

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“…3, reported in Leung et al 8 ). The structural damping simply acts to enhance the TL particularly when the panel is long.…”

Section: Resultsmentioning

confidence: 67%

“…In fact, we got the same weak peak back from the calculation of the same problem using a loose fluid-panel coupling approach. 8 That further supports an assumed harmonic dependence is too restrictive for resolving the ASI problem completely.…”

Section: Resultsmentioning

confidence: 92%

“…We conducted an evaluation of different fluid-panel coupling schemes with a similar problem of interest. 8 It was concluded that the one built along the idea of Jadic et al 20 is able to give the solution accuracy required in resolving AASI correctly, so we choose it in all the calculations. A brief of the construction of the coupling scheme is given in Appendix A.…”

Section: Boundary Conditions and Fluid-panel Couplingmentioning

confidence: 99%

“…All panel mesh points are located below the row of CE/SE solution points just next to boundary of fluid domain. All the spatial and temporal derivatives of w are approximated using standard central difference schemes, 18 whose details of derivation is referred to Leung et al 8 The time-marching of the panel displacement from the jth to (j þ 1)th time step, with size Dt, is approximated as w n;jþ1 ¼ ½Cw n;jÀ1 Dt À 2q p h p ðw n;jÀ1 À 2w n;j Þ þ 2Dt 2 ðp À p 0 Þ þ 2T x w n;j xx Dt 2 =ð2q p h p þ CDtÞ:…”

Section: B Panel Dynamic Modelmentioning

confidence: 99%

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Numerical analysis of aeroacoustic-structural interaction of a flexible panel in uniform duct flow

Fan

Leung

Lam

2015

The Journal of the Acoustical Society of America

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Accurate prediction of the acoustics of fluid-structure interaction is important in devising quieting designs for engineering systems equipped with extensive flow duct networks where the thin duct wall panels are in contact with the flowing fluid. The flow unsteadiness generates acoustic waves that propagate back to the source region to modify the flow process generating them. Meanwhile the unsteady flow pressure excites the thin panels to vibrate, which in turn modifies the flow processes. Evidently a strong coupling between the fluid aeroacoustics and the panel structural dynamics exists. Such coupled physical processes have to be thoroughly understood; otherwise, effective quieting design is never achieved. This paper reports an analysis, using a time-domain numerical methodology the authors have recently developed, of the nonlinear aeroacoustic-structural interaction experienced by a flexible panel in a duct carrying a uniform mean flow. With no mean flow, the numerical results agree well with existing theories and reveal the physics of duct transmission loss. Four regimes of aeroacoustic-structural interaction are identified when the duct flow velocity increases from low subsonic to low supersonic values. Insight in the underlying physics of duct transmission loss at different velocities are highlighted and discussed.

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“…3, reported in Leung et al 8 ). The structural damping simply acts to enhance the TL particularly when the panel is long.…”

Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 92%