Simulation of Multiple Confined Impinging Jets on a Heated Plate Using the Lattice Boltzmann Method

2013 ◽  
Author(s):  
Masoud A. Al Rmah ◽  
Abdulmajeed A. Mohamad
Keyword(s):  
Reynolds Number ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Thermal Characteristics ◽  
Impinging Jets ◽  
Heated Plate ◽  
Two Dimensional ◽  
Thermal Flow ◽  
Confined Jets ◽  
Boltzmann Method

A laminar two-dimensional thermal-flow generated by multiple confined jets impinging on an isothermal plate is investigated numerically using the lattice Boltzmann method. The impinging plate is kept at a constant high temperature while a cold air is flowing through the jets. The effect of different parameters (Reynolds number (Re), and the ratio between the jets height (H) and jets width (W))on the hydrodynamics and thermal characteristics of the flow field is discussed. The Reynolds number is ranging from 50 to 400, and the (H/W) ratio is varying between 1 and 3W.

Analysis of Fluid Flow in Porous Media Using the Lattice Boltzmann Method: Inertial Flow Regime

2012 ◽  
Author(s):  
Huizhe Zhao ◽  
Aydin Nabovati ◽  
Cristina H. Amon
Keyword(s):  
Reynolds Number ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Critical Reynolds Number ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Inertial Effects ◽  
Inertial Flow ◽  
Boltzmann Method ◽  
Three Dimensional Simulations

In this work, we use the lattice Boltzmann method to study inertial flow in three-dimensional random fibrous porous materials. In order to validate the methodology, inertial flow in two-dimensional hexagonal arrangements of circular cylinders is simulated, and the results are compared against those previously reported in the literature. The three-dimensional fibrous porous materials are then constructed by randomly placing straight cylindrical fibers inside the computational domain. Inertial effects are studied systematically for a wide range of pore Reynolds numbers in materials with porosities between 0.60 and 0.95. A previously proposed semi-empirical relation is modified to represent the inertial effects in three-dimensional fibrous materials. Three distinct regimes of constant, quadratic, and linear relations between the inverse of the permeability and pore Reynolds number are observed for both two- and three-dimensional simulations. The critical Reynolds number, beyond which the inertial effects are strong and this relation is linear, is shown to be smaller in three-dimensional simulations, when compared to the critical Reynolds number in two-dimensional simulations.

Numerical Simulation of High Reynolds Number Flow Structure in a Lid-Driven Cavity Using MRT-LES

2014 ◽  
Vol 554 ◽  
pp. 665-669
Author(s):  
Leila Jahanshaloo ◽  
Nor Azwadi Che Sidik
Keyword(s):  
Reynolds Number ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Numerical Technique ◽  
Lattice Boltzmann Model ◽  
Navier Stokes ◽  
Navier Stokes Equation ◽  
Driven Cavity ◽  
Reynolds Number Flow ◽  
Boltzmann Method

The Lattice Boltzmann Method (LBM) is a potent numerical technique based on kinetic theory, which has been effectively employed in various complicated physical, chemical and fluid mechanics problems. In this paper multi-relaxation lattice Boltzmann model (MRT) coupled with a Large Eddy Simulation (LES) and the equation are applied for driven cavity flow at different Reynolds number (1000-10000) and the results are compared with the previous published papers which solve the Navier stokes equation directly. The comparisons between the simulated results show that the lattice Boltzmann method has the capacity to solve the complex flows with reasonable accuracy and reliability. Keywords: Two-dimensional flows, Lattice Boltzmann method, Turbulent flow, MRT, LES.

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