Hermite regularization of the lattice Boltzmann method for open source computational aeroacoustics

Brogi, Federico; Malaspinas, Orestis Pileas; Chopard, Bastien; Bonadonna, Costanza

doi:10.1121/1.5006900

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Title		Hermite regularization of the lattice Boltzmann method for open source computational aeroacoustics
Authors		Brogi, Federico Malaspinas, Orestis Pileas Chopard, Bastien Bonadonna, Costanza
Published in		Journal of the Acoustical Society of America. 2017, vol. 142, no. 4, p. 2332-2345
Abstract		The lattice Boltzmann method (LBM) is emerging as a powerful engineering tool for aeroacoustic computations. However, the LBM has been shown to present accuracy and stability issues in the medium-low Mach number range, which is of interest for aeroacoustic applications. Several solutions have been proposed but are often too computationally expensive, do not retain the simplicity and the advantages typical of the LBM, or are not described well enough to be usable by the community due to proprietary software policies. An original regularized collision operator is proposed, based on the expansion of Hermite polynomials, that greatly improves the accuracy and stability of the LBM without significantly altering its algorithm. The regularized LBM can be easily coupled with both non-reflective boundary conditions and a multi-level grid strategy, essential ingredients for aeroacoustic simulations. Excellent agreement was found between this approach and both experimental and numerical data on two different benchmarks: the laminar, unsteady flow past a 2D cylinder and the 3D turbulent jet. Finally, most of the aeroacoustic computations with LBM have been done with commercial software, while here the entire theoretical framework is implemented using an open source library (PALABOS).
Keywords		Aeroacoustics — Lattice Boltzmann methods — Fluid jets — Error correction — Numerical
Identifiers		DOI: 10.1121/1.5006900
Full text		Article (Author postprint) (2 MB) - Free access
Structures		Faculté des sciences / Département d'informatique Centres et instituts / Centre universitaire d'informatique Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département des sciences de la Terre
Research groups		Physical Volcanology and Geological Risk Scientific and Parallel Computing
Citation (ISO format)		BROGI, Federico et al. Hermite regularization of the lattice Boltzmann method for open source computational aeroacoustics. In: Journal of the Acoustical Society of America, 2017, vol. 142, n° 4, p. 2332-2345. doi: 10.1121/1.5006900 https://archive-ouverte.unige.ch/unige:101050