| Issue |
Acta Acust.
Volume 7, 2023
Topical Issue - Aeroacoustics: state of art and future trends
|
|
|---|---|---|
| Article Number | 5 | |
| Number of page(s) | 11 | |
| DOI | https://doi.org/10.1051/aacus/2022062 | |
| Published online | 13 January 2023 | |
Scientific Article
A direct-hybrid CFD/CAA method based on lattice Boltzmann and acoustic perturbation equations
1
Chair of Fluid Mechanics and Institute of Aerodynamics, RWTH Aachen University, Wüllnerstr. 5a, 52062 Aachen, Germany
2
JARA – Center for Simulation and Data Science, RWTH Aachen University, Kopernikusstraße 6, 52074 Aachen, Germany
* Corresponding author: m.gondrum@aia.rwth-aachen.de
Received:
18
April
2022
Accepted:
12
December
2022
The accuracy of two direct coupled two-step CFD/CAA methods is discussed. For the flow field either a finite-volume (FV) method for the solution of the Navier–Stokes equations or a lattice Boltzmann (LB) method is coupled to a discontinuous Galerkin (DG) method for the solution of the acoustic perturbation equations. The coupling takes advantage of a joint Cartesian mesh allowing for the exchange of the acoustic sources without MPI communication. An immersed boundary treatment of the acoustic scattering from solid bodies by a novel solid wall formulation is implemented and validated in the DG method. Results for the case of a spinning vortex pair and the low Reynolds number unsteady flow around a circular cylinder show that a solution with comparable accuracy is obtained for the two direct-hybrid methods when using identical mesh resolution.
Key words: Computational aeroacoustics / Lattice Boltzmann / Acoustic perturbation equations / Immersed boundary method
© The Author(s), published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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