نتایج جستجو برای: lattice boltzmann method

تعداد نتایج: 1716730  

2013
Alessandro Leonardi Falk K. Wittel Hans J. Herrmann

We explore possible applications of the Lattice-Boltzmann Method for the simulation of geophysical flows. This fluid solver, while successful in other fields, is still rarely used for geotechnical applications. We show how the standard method can be modified to represent freesurface realization of mudflows, debris flows, and in general any plastic flow, through the implementation of a Bingham c...

Journal: :J. Comput. Physics 2009
Denis Ricot Simon Marié Pierre Sagaut Christophe Bailly

For high-Reynolds number flows, the lattice Boltzmann method suffers from numerical instabilities that can induce local blowup of the computation. The von Neumann stability analysis applied to the LBE-BGK and LBE-MRT models shows that numerical instabilities occur in the high wavenumber range and are due to the interplay between acoustic modes and some other modes. As it is done in the LBE-MRT ...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2009
N I Prasianakis I V Karlin J Mantzaras K B Boulouchos

An isothermal model on the standard two-dimension nine-velocity lattice (D2Q9) is proposed and analyzed. It originates from the thermal model with energy conservation introduced by N. I. Prasianakis and I. V. Karlin [Phys. Rev. E 76, 016702 (2007)]. The isothermal and the thermal equivalent models are tested through the simulation of the decay of a shear wave and of a temperature wave. Both are...

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2011
Yanbing Li Xiaowen Shan

The lattice Boltzmann method (LBM) has been proved to be a useful tool in many areas of computational fluid dynamics, including computational aero-acoustics (CAA). However, for historical reasons, its applications in CAA have been largely restricted to simulations of isothermal (Newtonian) sound waves. As the recent kinetic theory-based reformulation establishes a theoretical framework in which...

2013
Anna-Karin Tornberg Michael Hanke Ludvig af Klinteberg

This work contains a brief review of the lattice Boltzmann method. Specifically, Shan-Chen pseudopotential approach is described in details to simulate two immiscible components and understand the deformation of a droplet in a shear velocity. We also discuss the stability of the model in terms of different parameters and effects of those parameters on deformation of the droplet. Furthermore, th...

2017
M. Sbragaglia R. Benzi L. Biferale S. Succi K. Sugiyama F. Toschi

• A submitted manuscript is the author’s version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher’s website. • The final author version ...

2010
Ben Amara Mohamed El Amine Ben Nasrallah Sassi

A lattice Boltzmann method for a three dimensional lid driven cavity of cubic and parallelipedic geometries is developed on a desktop computer; No-slip boundary conditions are implemented by the so called Bounce back boundry conditions and the Dirichlet boundary condition for the upper moving wall is treated by the Zou/He boundary condition. The lattice Boltzmann simulation is carried out using...

2009
Yan Peng Wei Liao Li-Shi Luo Lian-Ping Wang

We compare the lattice Boltzmann method (LBM) and Pseudo-Spectral (PS) method for direct numerical simulation of decaying homogeneous isotropic turbulence. In this study we use the generalized lattice Boltzmann equation (GLBE) with multiple-relaxationtime (MRT) collision model, which overcomes all the apparent defects in the popular lattice BGK equation. We first compare the instantaneous flow ...

2003
Pierre Lallemand Li-Shi Luo

We propose a lattice Boltzmann method to treat moving boundary problems for solid objects moving in a fluid. The method is based on the simple bounce-back boundary scheme and interpolations. The proposed method is tested in two flows past an impulsively started cylinder moving in a channel in two dimensions: (a) the flow past an impulsively started cylinder moving in a transient Couette flow; a...

Journal: :J. Comput. Physics 2017
Simon Marié Xavier Gloerfelt

In this study, a new selective filtering technique is proposed for the Lattice Boltzmann Method. This technique is based on an adaptive implementation of the selective filter coefficient σ. The proposed model makes the latter coefficient dependent on the shear stress in order to restrict the use of the spatial filtering technique in sheared stress region where numerical instabilities may occur....

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