Please use this identifier to cite or link to this item: https://doi.org/10.15480/882.4735
Publisher DOI: 10.3390/jmse10111651
Title: Hybrid Lattice-Boltzmann-potential flow simulations of turbulent flow around submerged structures
Language: English
Authors: O'Reilly, Christopher 
Grilli, Stephan T. 
Janßen, Christian F.  
Dahl, Jason M. 
Harris, Jeffrey 
Keywords: hybrid method; Lattice-Boltzmann method; potential flow; GPGPU implementation
Issue Date: 3-Nov-2022
Publisher: Multidisciplinary Digital Publishing Institute
Source: Journal of Marine Science and Engineering 10 (11): 1651 (2022)
Abstract (english): 
We report on the development and validation of a 3D hybrid Lattice Boltzmann Model (LBM), with Large Eddy Simulation (LES), to simulate the interactions of incompressible turbulent flows with ocean structures. The LBM is based on a perturbation method, in which the velocity and pressure are expressed as the sum of an inviscid flow and a viscous perturbation. The far- to near-field flow is assumed to be inviscid and represented by potential flow theory, which can be efficiently modeled with a Boundary Element Method (BEM). The near-field perturbation flow around structures is modeled by the Navier–Stokes (NS) equations, based on a Lattice Boltzmann Method (LBM) with a Large Eddy Simulation (LES) of the turbulence. In the paper, we present the hybrid model formulation, in which a modified LBM collision operator is introduced to simulate the viscous perturbation flow, resulting in a novel perturbation LBM (pLBM) approach. The pLBM is then extended for the simulation of turbulence using the LES and a wall model to represent the viscous/turbulent sub-layer near solid boundaries. The hybrid model is first validated by simulating turbulent flows over a flat plate, for moderate to large Reynolds number values, ...
A good agreement is found for the computed lift and drag forces, and pressure distribution on the foil, with experiments and results of other numerical methods. Results obtained with the pLBM model are either nearly identical or slightly improved, relative to those of the standard LBM, but are obtained in a significantly smaller computational domain and hence at a much reduced computational cost, thus demonstrating the benefits of the new hybrid approach.
URI: http://hdl.handle.net/11420/14071
DOI: 10.15480/882.4735
ISSN: 2077-1312
Journal: Journal of marine science and engineering 
Other Identifiers: doi: 10.3390/jmse10111651
Institute: Fluiddynamik und Schiffstheorie M-8 
Document Type: Article
Funded by: Office of Naval Research Global 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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