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• W1993896276 abstract "Hybrid computational aero-acoustic (CAA) solution schemes rely on knowledge of a scattering function known as a Green’s function to propagate source fluctuations to the far-field. Presently, these schemes are restricted to relatively simple geometries. We present here a computational method for evaluating Green’s functions within more geometrically complex regions, as a means of extending the versatility of existing hybrid schemes. The direct collocation implementation of the Boundary Element Method used in truncated, semi-infinite domains, introduces additional unknowns on the boundary. In this paper we develop a modified boundary element formulation to efficiently incorporate approximate non-reflecting boundary conditions for an arbitrary number of truncation boundaries. The boundary condition is based on the Dirichlet-to-Neumann mapping operator. Results are compared to known analytical Green’s functions for an infinite pipe as a means of validating the new code. The method achieves relative errors of less than 1% compared with the analytical solution for the highest mesh density tested. Execution time, known to be large for acoustic problems, is minimised through the use of multi-threading. The scheme is also applied to a more realistic example of a 2D throttle." @default.
• W1993896276 created "2016-06-24" @default.
• W1993896276 creator A5017690416 @default.
• W1993896276 creator A5076240385 @default.
• W1993896276 date "2015-07-01" @default.
• W1993896276 modified "2023-09-29" @default.
• W1993896276 title "Calculation of acoustic Green’s functions using BEM and Dirichlet-to-Neumann-type boundary conditions" @default.
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• W1993896276 doi "https://doi.org/10.1016/j.apm.2014.12.027" @default.
• W1993896276 hasPublicationYear "2015" @default.
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