We report on recent progress and validation of a 3D hybrid model for naval hydrodynamics problems based on a perturbation method, in which both velocity and pressure are expressed as the sum of an inviscid flow with a viscous perturbation. The farto near-field inviscid flows can be solved with a Boundary Element Method (BEM), based on fully nonlinear potential flow theory, and the near-field pe...

Artificial dissipation is a well known tool for the improvement of stability of numerical algorithms. At the same time, this affects the accuracy of the computation. We analyze various approaches proposed for enhancement of the Lattice Boltzmann Methods (LBM) stability. In addition to the previously known methods, the Multiple Relaxation Time (MRT) models, the entropic lattice Boltzmann method ...

The lattice Boltzmann methods (LBMs) have successfully been applied to microscale flows in the hydrodynamic regime, such as flows of liquids in porous media. However, the LBM in its standard formulation does not produce correct results beyond the hydrodynamic regime, i.e., for slip and transitional ones. Following the work of Shan and He [Phys. Rev. Lett. 80, 65 (1998)], we propose to extend th...

The Lattice Boltzmann Method (LBM), e.g. in [3] and [4], can be interpreted as an alternative method for the numerical solution of partial differential equations. LBM is usually applied to solve fluid flows. However, interpretation a general tool, allows extend solid mechanics well. In this spirit, has been studied recent years. First publications [5], [6] present scheme dynamic behavior linear...

Recently the single relaxation time Lattice Boltzmann Method (hereinafter LBM) has considerably spread in Computational Hydraulics. Such a diffusion is motivated by the fact that the corresponding numerical algorithm is much simpler than the ones derived from “classical” hydraulic models, such as e.g. the Shallow Water (hereinafter SW) equations. The main drawback of the standard LBMbased model...

The lattice Boltzmann method (LBM) is an alternative to the conventional computational fluid dynamic (CFD) methods. It gained popularity due its simplicity in coding and dealing with a complex flow such as multiphase flow. based on kinetic theory, which mesoscopic scale. Hence, applying LBM for macroscopic problems requires proper conversion from physical scale (conventional units) (lattice vic...

This technical paper outlines the predictive performance of a recently published dynamic cumulant lattice Boltzmann method (C-LBM) to model turbulent shear flows at all resolutions. Emphasis is given simple strategy that avoids frequently observed velocity overshoot phenomenon near rigid walls when combining C-LBM with an all-resolution (universal) wall function. The examples included are confi...

In this paper an innovative computational approach, namely the Lattice Boltzmann Method (LBM), is used for simulating and modeling plasma jet behaviors. Plasma jets are a high temperature flows, then all physical parameters are temperature dependent. This work aims to address the issue of simulating plasma-jet from the point of view of extending the applications to simulating flows with tempera...

This article is concerned with the spatial coupling of a lattice Boltzmann model (LBM) and the finite difference discretization of the corresponding partial differential equation (PDE). At the interface, we have a one-to-many problem since the macroscopic PDE variables have to be mapped to more LBM variables. We show how this mapping can be done either analytically, using results from the Chapm...

The lattice Boltzmann method (LBM) and large-eddy simulation (LES) are combined with a scalar subgrid-scale model to simulate the indoor air velocity field harmful gas dispersion. LBM-LES is validated by comparing its results published experimental numerical results. Taking simplified chemical building as scenario, relative ventilation efficiency evaluated based on maximum concentration, config...