Aerodynamics and Acoustic Sources of the Exhaust Jet in a Car Air-Conditioning System

A. Le Due, N. Peller, M. Manhart, E. P. Wachsmann

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

4 Scopus citations

Abstract

This chapter discusses an application of large-eddy simulation to noise prediction. The chapter considers an example of car air-conditioning jet exiting into the passenger's compartment that produces a broadband noise. Within a hybrid approach, the acoustic sources are computed using Lighthill's acoustic analogy. The flow is solved using a Cartesian solver combined with an immersed boundary method, which takes into account the complex exhaust nozzle. This technique results in an efficient solver that allows for highly resolved computations of the flow field. The chapter investigates the influence of grid resolution and boundary approximation order on time averaged velocity fields as well as on acoustic sources. The mean flow results highlight that the complex geometry jet does not behave like a classical turbulent jet. The numerical investigations show that a smooth representation of the surface together with an adequate grid resolution is required to represent the small vortical structures giving the main contribution to the acoustic quadrupole terms. If one requirement is not met, errors in the strength of the acoustic source terms and their dynamic response can be considerable.

Original languageEnglish
Title of host publicationEngineering Turbulence Modelling and Experiments 6
PublisherElsevier
Pages709-718
Number of pages10
ISBN (Print)9780080445441
DOIs
StatePublished - 2005

Fingerprint

Dive into the research topics of 'Aerodynamics and Acoustic Sources of the Exhaust Jet in a Car Air-Conditioning System'. Together they form a unique fingerprint.

Cite this