Title: Exhaust pipe noise radiation modelling: applicability of using the Fourier PSTD and DG methods
Authors: Hornikx, Maarten ×
De Roeck, Wim
Toulorge, Thomas
Desmet, Wim #
Issue Date: Apr-2012
Publisher: Academic Press
Series Title: Journal of Sound and Vibration
Abstract: The noise, radiated from the tailpipe of automotive exhaust ducts, is affected by the jet flow leaving the exhaust and by its surrounding geometry. The current work investigates the applicability of a hbrid approach to solve this problem. First, the mean flow in and behind the tailpipe is computed by solving the Reynolds averaged Navier-Stokes equations (RANS). Then, sound radiation from the tailpipe is computed through solving the linearized Euler equations (LEE). As the vorticity modes in the shear layer of the exhaust jet behind the tailpipe may turn unstable using the LEE, the LEE with mean flow gradient terms suppressed (LEE-GTS) are solved too. For accurate results in the current application, results show the necessity of solving the LEE rather than the LEE-GTS. At the same time, the performance of solving the LEE by two numerical methods, the extended
Fourier pseudospectral time-domain (PSTD) method or the Discontinuous Galerkin (DG) method, is assessed. It is done along with analytical results for radiation from the pipe in the free field. Issues related to grid discretization, stability and mean flow filtering are treated and satisfying accuracy for both methods is obtained. Due to the lower computational effort, the PSTD method is favoured
over the DG method for the current application in a Cartesian 3D configuration. To demonstrate its capabilities, a calculation with PSTD for the 3-D configuration of the tailpipe in the presence of
a ground surface is performed.
ISSN: 0022-460X
Publication status: submitted
KU Leuven publication type: IT
Appears in Collections:Production Engineering, Machine Design and Automation (PMA) Section
× corresponding author
# (joint) last author

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