Abstract:
:Multiple-relaxation-time (MRT) lattice Boltzmann methods (LBM) based on orthogonal moments exhibit lattice Mach number dependent instabilities in diffusive scaling. The present work renders an explicit formulation of stability sets for orthogonal moment MRT LBM. The stability sets are defined via the spectral radius of linearized amplification matrices of the MRT collision operator with variable relaxation frequencies. Numerical investigations are carried out for the three-dimensional Taylor-Green vortex benchmark at Reynolds number 1600. Extensive brute force computations of specific relaxation frequency ranges for the full test case are opposed to the von Neumann stability set prediction. Based on that, we prove numerically that a scan over the full wave space, including scaled mean flow variations, is required to draw conclusions on the overall stability of LBM in turbulent flow simulations. Furthermore, the von Neumann results show that a grid dependence is hardly possible to include in the notion of linear stability for LBM. Lastly, via brute force stability investigations based on empirical data from a total number of 22 696 simulations, the existence of a deterministic influence of the grid resolution is deduced. This article is part of the theme issue 'Progress in mesoscale methods for fluid dynamics simulation'.
journal_name
Philos Trans A Math Phys Eng Scijournal_title
Philosophical transactions. Series A, Mathematical, physical, and engineering sciencesauthors
Simonis S,Haussmann M,Kronberg L,Dörfler W,Krause MJdoi
10.1098/rsta.2020.0405keywords:
["Navier–Stokes equations","brute force method","homogeneous isotropic turbulence","multiple-relaxation-time lattice Boltzmann methods","relaxation system","stability"]subject
Has Abstractpub_date
2021-10-18 00:00:00pages
20200405issue
2208eissn
1364-503Xissn
1471-2962journal_volume
379pub_type
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