Open AccessApplication Limits of Conservative Source Interpolation Methods Using a Low Mach Number Hybrid Aeroacoustic Workflow
Author(s) -
Stefan Schoder,
Andreas Wurzinger,
Clemens Junger,
Michael Weitz,
Clemens Freidhager,
Klaus Roppert,
Manfred Kaltenbacher
Publication year - 2021
Publication title -
journal of theoretical and computational acoustics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.479
H-Index - 38
eISSN - 2591-7811
pISSN - 2591-7285
DOI - 10.1142/s2591728520500322
Subject(s) - interpolation (computer graphics) , polygon mesh , mach number , computer science , convergence (economics) , centroid , aeroacoustics , trilinear interpolation , algorithm , acoustics , mathematics , spline interpolation , geometry , physics , mechanics , bilinear interpolation , motion (physics) , artificial intelligence , sound pressure , computer vision , economics , economic growth
In low Mach number aeroacoustics, the well-known disparity of scales allows applying hybrid simulation models using different meshes for flow and acoustics, which leads to a fast computational procedure. The hybrid workflow of the perturbed convective wave equation involves three steps: (1) perform unsteady incompressible flow computations on a subdomain; (2) compute the acoustic sources and (3) simulate the acoustic field, using a mesh specifically suited. These aeroacoustic methods seek for a robust, conservative and computational efficient mesh-to-mesh transformation of the aeroacoustic sources. In this paper, the accuracy and the application limitations of a cell-centroid-based conservative interpolation scheme is compared to the computationally advanced cut-volume cell approach in 2D and 3D. Based on a previously validated axial fan model where spurious artifacts have been visualized, the results are evaluated systematically using a grid convergence study. To conclude, the monotonic convergence of both conservative interpolation schemes is demonstrated. Regarding arbitrary mesh deformation (for example, the motion of the vocal folds in human phonation), the study reveals that the computationally simpler cell-centroid-based conservative interpolation can be the method of choice.