Publisher DOI: 10.1016/j.compfluid.2020.104723
Title: A Lattice-Boltzmann-based perturbation method
Language: English
Authors: O'Reilly, Christopher 
Janßen, Christian Friedrich  
Grilli, Stephan T. 
Keywords: GPGPU implementation;Hybrid method;Lattice-Boltzmann model;Marine hydrodynamics;Potential flow
Issue Date: 15-Dec-2020
Source: Computers and Fluids (213): 104723 (2020-12-15)
Journal: Computers & fluids 
Abstract (english): 
In this work, we report on the development and initial validation of a new hybrid numerical model for the simulation of incompressible flow. A kinetic Lattice Boltzmann method (LBM) model using a reduced domain is nested within an inviscid flow field to provide increased simulation fidelity where desired, while leveraging the computational efficiency of inviscid solutions. We formulate a fully (or strongly) coupled approach, in which a Helmholtz decomposition is applied to the flow, separating the inviscid and viscous perturbation parts. The latter component is driven by the inviscid field through nonlinear inviscid-perturbation interaction terms that, in conventional Navier-Stokes solvers, would be expressed as volume forces. In the present work an equivalent LBM approach is presented where, as opposed to a body-force coupling, a strong coupling within the LBM collision operators is presented. The resulting hybrid LBM is applied to validation cases for a wave driven boundary layer and the flow past a cylinder.
ISSN: 0045-7930
Institute: Fluiddynamik und Schiffstheorie M-8 
Document Type: Article
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