Lighthill's analogy applied to an automotive turbocharger compressor

Clemens Freidhager, Martin Heinisch, Andreas Renz, Stefan Schoder, Manfred Kaltenbacher

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review

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.

Original languageEnglish
Title of host publicationProceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering
EditorsTyler Dare, Stuart Bolton, Patricia Davies, Yutong Xue, Gordon Ebbitt
PublisherThe Institute of Noise Control Engineering of the USA, Inc.
ISBN (Electronic)9781732598652
DOIs
Publication statusPublished - 2021
Event50th International Congress and Exposition of Noise Control Engineering: INTER-NOISE 2021 - Washington DC, Virtuell, United States
Duration: 1 Aug 20215 Aug 2021

Publication series

NameProceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering

Conference

Conference50th International Congress and Exposition of Noise Control Engineering
Country/TerritoryUnited States
CityVirtuell
Period1/08/215/08/21

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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