2013
DOI: 10.1016/j.jsv.2012.07.051
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An adjoint-based method for liner impedance eduction: Validation and numerical investigation

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Cited by 42 publications
(48 citation statements)
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“…The underlying model is briefly summarized here for convenience, but all details can be found elsewhere. 5 The LEE, written in non-conservative form, with an e jωt time dependence, assuming homentropic flow is…”
Section: Impedance Eduction Approachmentioning
confidence: 99%
See 1 more Smart Citation
“…The underlying model is briefly summarized here for convenience, but all details can be found elsewhere. 5 The LEE, written in non-conservative form, with an e jωt time dependence, assuming homentropic flow is…”
Section: Impedance Eduction Approachmentioning
confidence: 99%
“…In order to describe more precisely the local effects on the liner, ONERA applied a Laser Doppler Anemometry (LDA) technique to measure the acoustic velocity fields in the area above the liner, and used them as inputs for the eduction process. [3][4][5] The numerical resolution of the Linearized Euler Equations (LEE) was obtained with a discontinuous Galerkin scheme, accounting naturally for the presence of a shear flow in the simulation. The main challenge is to ensure the best reliability of the eduction process and high accuracy of the results.…”
Section: Introductionmentioning
confidence: 99%
“…[5][6][7][8] The only differences arising appear in the low frequency range in the presence of flow, and are attributed to the consideration of the shear layer of the mean flow. This suggests that the numerical methods used at NASA and ONERA can be considered equivalent, at least concerning the obtained impedances; other properties such as convergence speed remain to be studied.…”
Section: Discussionmentioning
confidence: 99%
“…The underlying model is briefly summarized here for convenience, but all details can be found in a previous paper. 5 We use the same notations as in section II.B.1. The linearized Euler equations, written under non-conservative form with a e iωt time dependence, read:…”
Section: Iib2 Onera Methodsmentioning
confidence: 99%
“…A three-dimensional finite element model based on the convected Helmholtz's equation with a uniform flow was used with the IngardMyers's coupling condition to fit experimental data in previous works. 1 The optimization problem was also solved with the adjoint-based method 3 without the usual cumbersome calculations necessary to find the optimum. Other inverse methods were proposed [4][5][6] where the cost functions were based either on the sound pressures at the walls, 5 the scattering matrix coefficients, 4 or the power dissipated by the liner, 6 while the direct models rely either on a mode matching method, 4,5,7 or an axisymmetric finite element method.…”
Section: Introductionmentioning
confidence: 99%