Gaseous slip flow simulation in a micro/nano pore-throat structure using the lattice Boltzmann model

2019 ◽  
Vol 177 ◽  
pp. 93-103 ◽  
Author(s):  
Nader Mosavat ◽  
Babak Hasanidarabadi ◽  
Peyman Pourafshary
Keyword(s):  
Lattice Boltzmann ◽  
Slip Flow ◽  
Flow Simulation ◽  
Lattice Boltzmann Model ◽  
Pore Throat ◽  
Gaseous Slip Flow ◽  
Boltzmann Model

SLIP ON CURVED BOUNDARIES IN THE LATTICE BOLTZMANN MODEL

2007 ◽  
Vol 18 (01) ◽  
pp. 15-24 ◽  
Author(s):  
LAJOS SZALMÁS
Keyword(s):  
Couette Flow ◽  
Lattice Boltzmann ◽  
Slip Flow ◽  
Distribution Functions ◽  
Lattice Boltzmann Model ◽  
Momentum Balance ◽  
Curved Boundaries ◽  
Cylindrical Couette Flow ◽  
Boltzmann Method ◽  
Boltzmann Model

We present a new boundary condition in the lattice Boltzmann method to model slip flow along curved boundaries. A requirement is formulated for the distribution functions based on the tunable momentum balance at the walls, which is shown to be equivalent to the constraint on the second moment. Numerical simulation of plane Couette flow in inclined channels and cylindrical Couette flow shows excellent agreement with the analytical results in the nearly continuum regime. Orientation effects on the velocity field are completely avoided.

Lattice Boltzmann Thermal Flow Simulation and Measurements of a Modified SAE Model With Heated Plug

2006 ◽  
Author(s):  
Ehab Fares ◽  
Sacha Jelic ◽  
Timo Kuthada ◽  
David Schro¨ck
Keyword(s):  
Lattice Boltzmann ◽  
Flow Simulation ◽  
Lattice Boltzmann Model ◽  
The Novel ◽  
Predictive Capability ◽  
Road Vehicles ◽  
Wall Model ◽  
New Developments ◽  
Experimental Findings ◽  
Boltzmann Model

This article presents the novel experiment of the modified SAE model with a heated plug and discusses the details about the new developments of the numerical model of the PowerFLOW 4.0 version, which employs a Lattice Boltzmann model and incorporates an improved unsteady two equations RNG k-ε turbulence model, a coupled PDE for the energy equation and an advanced wall model for both flow and thermal boundary layers. The hot flow is discussed both experimentally and numerically. Distributions of the flow field are compared with available experimental findings. The predictive capability and the feasibility of the current Lattice Boltzmann approach is demonstrated and the applicability to similar flows over realistic road vehicles is discussed.

Simulation of Flow in Multi-Scale Porous Media Using the Lattice Boltzmann Method on Quadtree Grids

2016 ◽  
Vol 19 (4) ◽  
pp. 998-1014 ◽  
Author(s):  
Lei Zhang ◽  
Qinjun Kang ◽  
Li Chen ◽  
Jun Yao
Keyword(s):  
Porous Media ◽  
Lattice Boltzmann ◽  
Voronoi Tessellation ◽  
Flow Simulation ◽  
Lattice Boltzmann Model ◽  
Flow In Porous Media ◽  
Multi Scale ◽  
Multiple Length Scales ◽  
Boltzmann Method ◽  
Boltzmann Model

AbstractThe unified lattice Boltzmann model is extended to the quadtree grids for simulation of fluid flow through porous media. The unified lattice Boltzmann model is capable of simulating flow in porous media at various scales or in systems where multiple length scales coexist. The quadtree grid is able to provide a high-resolution approximation to complex geometries, with great flexibility to control local grid density. The combination of the unified lattice Boltzmann model and the quadtree grids results in an efficient numerical model for calculating permeability of multi-scale porous media. The model is used for permeability calculation for three systems, including a fractured system used in a previous study, a Voronoi tessellation system, and a computationally-generated pore structure of fractured shale. The results are compared with those obtained using the conventional lattice Boltzmann model or the unified lattice Boltzmann model on rectangular or uniform square grid. It is shown that the proposed model is an accurate and efficient tool for flow simulation in multi-scale porous media. In addition, for the fractured shale, the contribution of flow in matrix and fractures to the overall permeability of the fractured shale is studied systematically.

Sign in / Sign up

Export Citation Format

Share Document