Lighthill's analogy applied to an automotive turbocharger compressor

Freidhager C, Heinisch M, Renz A, Schoder S, Kaltenbacher M (2021)

Publication Type: Conference contribution

Publication year: 2021

Publisher: The Institute of Noise Control Engineering of the USA, Inc.

Conference Proceedings Title: Proceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering

Event location: Washington, DC, USA

ISBN: 9781732598652

DOI: 10.3397/IN-2021-1414

Abstract

Computing transient CFD simulations of turbocharger compressors is computationally very demanding. It is of fundamental importance to resolve turbulent structures at the location of their generation and to establish a fine enough grid to allow propagation of the resolved structures. This results in high-resolution grids, existing of more than 20 million cells. By applying Lighthill's analogy, it is possible to only resolve turbulent structures at their location of generation and compute the pressure propagation by using an additional, not that demanding acoustic grid. This allows using coarser CFD grids in the inlet and outlet section. Furthermore, pressure propagation simulations based on Lighthill's inhomogeneous wave equation with the Finite Element Method are less affected by numeric dissipation compared to standard Finite Volume methods used in proprietary CFD solvers. For transferring Lighthill's source terms from the CFD to the acoustic grid, advanced interpolation algorithms are used. The simulation results are validated by measurements of a cold gas test rig.

Authors with CRIS profile

Andreas Renz Lehrstuhl für Prozessmaschinen und Anlagentechnik

Involved external institutions

Technische Universität Graz AT Austria (AT) BMW AG - Bayerische Motoren Werke / BMW Group DE Germany (DE)

How to cite

APA:

Freidhager, C., Heinisch, M., Renz, A., Schoder, S., & Kaltenbacher, M. (2021). Lighthill's analogy applied to an automotive turbocharger compressor. In Tyler Dare, Stuart Bolton, Patricia Davies, Yutong Xue, Gordon Ebbitt (Eds.), Proceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering. Washington, DC, USA: The Institute of Noise Control Engineering of the USA, Inc..

MLA:

Freidhager, Clemens, et al. "Lighthill's analogy applied to an automotive turbocharger compressor." Proceedings of the 50th International Congress and Exposition of Noise Control Engineering, INTER-NOISE 2021, Washington, DC, USA Ed. Tyler Dare, Stuart Bolton, Patricia Davies, Yutong Xue, Gordon Ebbitt, The Institute of Noise Control Engineering of the USA, Inc., 2021.

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