Hybrid lattice Boltzmann method on overlapping grids
Author(s)
Date Issued
2017
Type
article
Volume
95
Issue
95
ISSN
24700053
Journal
Abstract
In this work, a hybrid lattice Boltzmann method (HLBM) is proposed, where the standard lattice Boltzmann implementation based on the Bhatnagar-Gross-Krook (LBGK) approximation is combined together with an unstructured finite-volume lattice Boltzmann model. The method is constructed on an overlapping grid system, which allows the coexistence of a uniform lattice nodes spacing and a coordinate-free lattice structure. The natural adaptivity of the hybrid grid system makes the method particularly suitable to handle problems involving complex geometries. Moreover, the provided scheme ensures a high-accuracy solution near walls, given the capability of the unstructured submodel of achieving the desired level of refinement in a very flexible way. For these reasons, the HLBM represents a prospective tool for solving multiscale problems. The proposed method is here applied to the benchmark problem of a two-dimensional flow past a circular cylinder for a wide range of Reynolds numbers and its numerical performances are measured and compared with the standard LBGK ones.
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Name
PRE_2017_accepted.pdf
Description
Postprint - authors' versions of the paper, including revisions resulting from the peer review process
Size
4.26 MB
Format
Adobe PDF
Checksum (MD5)
652394e6fae3388c2d63383c4061ee84
Conference(s)
PHYSICAL REVIEW. E