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Efficient computation of aerodynamic noise

Efficient computation of aerodynamic noise

Djambazov, Georgi S., Lai, Choi-Hong and Pericleous, Koulis A. ORCID: 0000-0002-7426-9999 (1998) Efficient computation of aerodynamic noise. In: Mandel, Jan, Farhat, Charbel and Cai, Xiao-Chuan, (eds.) Domain Decomposition Methods. Contemporary Mathematics, 10 (218). American Mathematical Society, Providence, Rhode Island, USA, pp. 500-506. ISBN 9780821809884 (doi:10.1090/conm/218)

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Computational Fluid Dynamics codes based on the Reynolds averaged Navier-Stokes equations may be used to simulate the generation of sound waves along with the other features of the flow of air. For adequate acoustic modeling the information about the sound sources within the flow is passed to a linearized Euler solver that accurately resolves the propagation of sound through the non-uniformly moving medium.

Aerodynamic sound is generated by the flow of air or results from the interaction of sound with airflow. Computation of aerodynamic noise implies direct simulation
of the sound field based on first principles [6]. It allows complex sound fields to be simulated such as those arising in turbulent flows.

When building a software tool for this simulation two options exist: (a) to develop a new code especially for this purpose, or (b) to use an existing Computational
Fluid Dynamics (CFD) code as much as possible. (As it will be shown later, due to numerical diffusion conventional CFD codes tend to smear the sound signal too close to its source, and cannot be used directly for aeroacoustic simulations.)

The second option is considered here as it seems to require less work and makes use of the vast amount of experience accumulated in flow modeling. CFD codes have built-in capabilities of handling non-linearities, curved boundaries, boundary layers, turbulence, and thermal effects. They are based on optimized, efficient, readily converging algorithms. If no CFD code is used as a basis, all these features have to be implemented again in the new code developed for the simulation of the sound field.

Item Type: Book Section
Additional Information: [1] This paper appears within Part 4. Applications of Domain Decomposition Methods 10. [2] ISBN: 9780821809884 (Print); 9780821811771 (Online). [3] ISSN 1098-3627 (online); ISSN 0271-4132 (print)
Uncontrolled Keywords: aerodynamic noise, non-linear equations, acoustic waves
Subjects: Q Science > QA Mathematics > QA76 Computer software
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Pre-2014 Departments: School of Computing & Mathematical Sciences
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Science & Engineering Group
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Last Modified: 14 Oct 2016 09:15
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