Multiscale semi-Lagrangian lattice Boltzmann method

نویسندگان

چکیده

We present a multi-scale lattice Boltzmann scheme, which adaptively refines particles' velocity space. Different sets of lower and higher order are consistently efficiently coupled, allowing us to use the higher-order model only when where needed. This includes regions high Mach or Knudsen numbers. The coupling procedure discrete consists either projection populations onto lower-order lifting Both local operations, enable flexible adaptive set. proposed scheme is formulated for both static an optimal, co-moving reference frame, in spirit recently introduced Particles on Demand method. validated with advection athermal vortex jet flow setup. performance further investigated shock structure problem high-Knudsen-number Couette flow, typical examples highly non-equilibrium flows set plays decisive role. results demonstrate that can operate accurately, flexibility terms underlying models reduced computational requirements.

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ژورنال

عنوان ژورنال: Physical review

سال: 2021

ISSN: ['0556-2813', '1538-4497', '1089-490X']

DOI: https://doi.org/10.1103/physreve.103.063305