We describe a high-performance implementation of the lattice-Boltzmann method (LBM) for sparse geometries on graphic processors. In our implementation we cover the whole geometry with a uniform mesh of small tiles and carry out calculations for each tile independently with a proper data synchronization at tile edges. For this method we provide both the theoretical analysis of complexity and the...

The semi-Lagrangian Vortex method (VM) and the Lattice Boltzmann (LBM) are used to investigate flows simulations in incompressible regime. In this study, a proven version of each is compared on different three dimensional benchmarks terms numerical accuracy, convergence, diffusion dissipation. first comparisons made convected vortex study compare dissipation LBM VM. Then Taylor–Green investigat...

Lattice Boltzmann methods (LBM) are an important part of current computational fluid dynamics (CFD). They allow easy implementations and boundary handling. However, competitive time to solution not only depends on the choice of a reasonable method, but also on an efficient implementation on modern hardware. Hence, performance optimization has a long history in the lattice Boltzmann community. A...

The accuracy of solid wall treatment in the lattice Boltzmann method (LBM) simulation of porous structures affects different hydraulic parameters including integral properties, such as permeability, or local phenomena, such as apparent slip. Based on an analysis of the advantages and disadvantages of the current methods, a new technique is introduced for exact boundary extraction from binary re...

In this paper we present JaMP, an adaptation of the OpenMP standard. JaMP is fitted to Jackal, a software-based DSM implementation for Java. While the set of supported directives is directly adopted from the OpenMP standard, we also satisfy all requirements that are enforced by the Java Language Specification and the Java Memory Model. JaMP implements a (large) subset of the OpenMP specificatio...

In this paper, an approach to simulating magnetohydrodynamic (MHD) flows based on the lattice Boltzmann method (LBM) is presented. The dynamics of the flow are simulated using a so-called multiple relaxation time (MRT) lattice Boltzmann equation (LBE), in which a source term is included for the Lorentz force. The evolution of the magnetic induction is represented by introducing a vector distrib...

this work presents a numerical analysis of entropy generation in γ-shaped enclosure that was submitted to the natural convection process using a simple thermal lattice boltzmann method (tlbm) with the boussinesq approximation.  a 2d thermal lattice boltzmann method with 9 velocities, d2q9, is used to solve the thermal flow problem. the simulations are performed at a constant prandtl number (pr ...

This article deals with artificial boundaries which you encounter when a large spatial domain is confined to a smaller computational domain. Such an artificial boundary condition should not preferably interact with the fluid at all. Standard boundary conditions, e.g., a pressure or velocity condition, result in unphysical reflections. So far, existing artificial boundary conditions for the latt...

In order to study the influence of wind shear on aerodynamic characteristics large turbines, taking 5MW turbine blade model published by NREL as research object, eddy simulation (LES) turbines was carried out using XFlow fluid software based Lattice-Boltzmann method (LBM). WALE turbulence used at 3, 11.2 and 25m/s speeds. The effect factors axial thrust torque is compared with data NREL. result...

This paper is devoted to the simulation of compressible magnetohydrodynamic (MHD) flows with Lattice Boltzmann Method (LBM). The usual LBM limited low-Mach flows. We propose a robust and accurate numerical method based on vectorial kinetic construction [5,25], which allows us extend arbitrary Mach also explain how adjust viscosity in order obtain stable results smooth or discontinuous parts flo...