An improved finite-element method for predicting sound propagation in nonuniform flows is proposed. Sound waves are described by the linearized potential theory solved in the frequency domain. Solutions are calculated using the p -FEM method with high-order, hierarchic shape functions that results in a drastic improvement in computational efficiency. The memory and time requirements for solving large-scale problems are significantly reduced compared with standard finite-element methods. An additional feature presented in this paper is an adaptive scheme to select the optimal interpolation order in each element so as to achieve a prescribed accuracy. This greatly simplifies the preparation of the numerical model. When performing a series of calculations at different frequencies there is no need to adjust the mesh to maintain a sufficient resolution. Instead the adaptive p -FEM method adjusts the interpolation order automatically to ensure an accurate solution is obtained. The performance of the method is demonstrated for three-dimensional test cases for noise radiation from a turbofan intake. Guidelines for preparing models using this adaptive, high-order approach are also discussed.


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    Title :

    Adaptive, High-Order Finite-Element Method for Convected Acoustics


    Contributors:
    Gabard, G. (author) / Bériot, H. (author) / Prinn, A. G. (author) / Kucukcoskun, K. (author)

    Published in:

    AIAA Journal ; 56 , 8 ; 3179-3191


    Publication date :

    2018-08-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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