Upper Openings Ventilation System Study of the Building by the Lattice Boltzmann Model

2021 ◽  
Vol 406 ◽  
pp. 164-169
Author(s):  
Zine Elabidine Bouayed ◽  
Samir Houat
Keyword(s):  
Lattice Boltzmann ◽  
Numerical Study ◽  
Ventilation System ◽  
Lattice Boltzmann Model ◽  
Heat Temperature ◽  
Double Population ◽  
Boltzmann Method ◽  
Thermal Lattice Boltzmann ◽  
Boltzmann Model ◽  
Floor Heating

We present in this work a numerical study of a ventilation system in a room with two openings in the ceiling and a floor heating indicated by constant heat temperature. The double population thermal lattice Boltzmann method is used, with nine velocities model D2Q9 for the dynamic field and a five velocities model D2Q5 for the temperature field. The results are presented in the form of streamlines, temperature contour and velocity profile, and analysed as a function of the Richardson number.

POROUS SUBSTRATE EFFECTS ON THERMAL FLOWS THROUGH A REV-SCALE FINITE VOLUME LATTICE BOLTZMANN MODEL

2014 ◽  
Vol 25 (02) ◽  
pp. 1350086 ◽  
Author(s):  
AHAD ZARGHAMI ◽  
SILVIA DI FRANCESCO ◽  
CHIARA BISCARINI
Keyword(s):  
Porous Media ◽  
Finite Volume ◽  
Lattice Boltzmann ◽  
Fluid Flows ◽  
Lattice Boltzmann Model ◽  
Parametric Studies ◽  
Boltzmann Method ◽  
Thermal Lattice Boltzmann ◽  
Boltzmann Model ◽  
Thermal Flows

In this paper, fluid flows with enhanced heat transfer in porous channels are investigated through a stable finite volume (FV) formulation of the thermal lattice Boltzmann method (LBM). Temperature field is tracked through a double distribution function (DDF) model, while the porous media is modeled using Brinkman–Forchheimer assumptions. The method is tested against flows in channels partially filled with porous media and parametric studies are conducted to evaluate the effects of various parameters, highlighting their influence on the thermo-hydrodynamic behavior.

Investigation of Porous Block Porosity on Flow and Entropy Generation inside a T-Micromixer Using Lattice Boltzmann Method

2012 ◽  
Vol 229-231 ◽  
pp. 282-286
Author(s):  
Mojtaba Aghajani Delavar
Keyword(s):  
Entropy Generation ◽  
Lattice Boltzmann ◽  
Lattice Boltzmann Model ◽  
Mixing Rate ◽  
Flow Reynolds Number ◽  
Porous Block ◽  
Mixing Rates ◽  
Boltzmann Method ◽  
Thermal Lattice Boltzmann ◽  
Boltzmann Model

In this study a two dimensional thermal Lattice Boltzmann model with nine velocities was used to study the flow pattern and thermal field inside a T-micromixer with a porous block. The effects of porosity of porous block and flow Reynolds number were investigated. The results showed that better mixing between hot and cold flows and more heat transfer to horizontal walls in contact with porous block in lower porosities; due to the fact that in lower porosities the effective thermal conductivity of porous block increases. In lower porosities due to higher mixing rates and thermal gradient the entropy generation will increase. According to results it was observed that model with lowest porosity has the maximum mixing rate between two entering hot and cold flows and maximum dimensionless entropy generation.

A numerical study of droplet dynamic behaviors on a micro-structured surface using a three dimensional color-gradient lattice Boltzmann model

Soft Matter ◽  
2018 ◽  
Vol 14 (5) ◽  
pp. 837-847 ◽  
Author(s):  
Zihao Cheng ◽  
Yan Ba ◽  
Jinju Sun ◽  
Chao Wang ◽  
Shengchuan Cai ◽  
...  
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Numerical Study ◽  
Three Dimensional ◽  
Lattice Boltzmann Model ◽  
Dynamic Behaviors ◽  
Structured Surfaces ◽  
Color Gradient ◽  
Boltzmann Method ◽  
Boltzmann Model

Non-circular droplet contact areas on micro-structured surfaces are simulated using the lattice Boltzmann method.

NUMERICAL STUDY OF 2D MULTIPHASE FLOWS OVER GROOVED SURFACE BY LATTICE BOLTZMANN METHOD

2007 ◽  
Vol 18 (04) ◽  
pp. 492-500 ◽  
Author(s):  
J. J. HUANG ◽  
C. SHU ◽  
Y. T. CHEW ◽  
H. W. ZHENG
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Body Force ◽  
Numerical Study ◽  
Lattice Boltzmann Model ◽  
Small Scale ◽  
Grooved Surface ◽  
Pass Through ◽  
Boltzmann Method ◽  
Boltzmann Model

In this paper, the effects of surface wettability and topography on a droplet, which is driven by a body force to pass through grooved walls, are studied by using the multiphase lattice Boltzmann model. At small scale, the shape and velocity of the droplet were found to be strongly affected by the wettability and configuration of the wall. The drag on the droplet moving over grooved surfaces was found to decrease as the wall hydrophobicity increases. It was also found that the wettability decides whether the droplet fills or does not fill the whole grooves.

Lattice Boltzmann Method for Numerical Simulation of Circular Tube Forced Convection

2013 ◽  
Vol 765-767 ◽  
pp. 460-464
Author(s):  
Shou Guang Yao ◽  
Gong Li Wang ◽  
Qing Fang Cheng ◽  
Chang Jiang Zhou
Keyword(s):  
Lattice Boltzmann Method ◽  
Forced Convection ◽  
Lattice Boltzmann ◽  
Circular Tube ◽  
Velocity Model ◽  
Lattice Boltzmann Model ◽  
Distribution Model ◽  
Boltzmann Method ◽  
Thermal Lattice Boltzmann ◽  
Boltzmann Model

This paper established the thermal Lattice Boltzmann model of fluid flow and heat transfer, which is based on double lattice Boltzmann distribution model [. The temperature distribution adopted the higher accuracy velocity model. Based on this thermal lattice Boltzmann model, this paper simulated forced convection of circular tube fluid. Comparing the simulation results with the traditional CFD calculation results, we could find that the thermal lattice Boltzmann method have unique advantages in effectiveness and flexibility than the traditional calculation method.

Comparative Study of the Flow in a Differentially Heated Cavity Using Thermal Lattice Boltzmann Method

2013 ◽  
Vol 300-301 ◽  
pp. 1122-1126
Author(s):  
Wei Shan Chen ◽  
Di Bo Dong ◽  
Zhen Xiu Hou ◽  
Sheng Jun Shi
Keyword(s):  
Mass Transfer ◽  
Nusselt Number ◽  
Lattice Boltzmann ◽  
Critical Value ◽  
Lattice Boltzmann Model ◽  
Circulation Rate ◽  
Boltzmann Method ◽  
Thermal Lattice Boltzmann ◽  
Boltzmann Model ◽  
Rayleigh Numbers

A D2Q9 thermal lattice Boltzmann model is applied to investigate the flow in a differentially heated cavity. The paper is intended to analysis the physics of heat and mass transfer in a closure cavity filled with air. For three Rayleigh numbers Ra, the aspect ratio K are varied from 1 to 10. Results of validation indicate this algorithm is reliable and easy for implementation. It can be found that the circulation rate of heat driven flow get lower when the K get higher. Also, the Nusselt number Nu tends to be approximated to 1 when K is higher than a critical value, which is depended on the value of Ra.

Modeling of collapsing cavitation bubble near solid wall by 3D pseudopotential multi-relaxation-time lattice Boltzmann method

2017 ◽  
Vol 232 (3) ◽  
pp. 445-456 ◽  
Author(s):  
Minglei Shan ◽  
Yu Yang ◽  
Hao Peng ◽  
Qingbang Han ◽  
Changping Zhu
Keyword(s):  
Relaxation Time ◽  
Lattice Boltzmann ◽  
Cavitation Bubble ◽  
Solid Wall ◽  
Three Dimensional ◽  
Lattice Boltzmann Model ◽  
Bubble Collapse ◽  
Lattice Boltzmann Simulation ◽  
Boltzmann Method ◽  
Boltzmann Model

Understanding the dynamic characteristic of the cavitation bubble near a solid wall is a fundamental issue for the bubble collapse application and prevention. In the present work, an improved three-dimensional multi-relaxation-time pseudopotential lattice Boltzmann model is adopted to investigate the cavitation bubble collapse near the solid wall. With respect to thermodynamic consistency, Laplace law verification, the three-dimensional pseudopotential multi-relaxation-time lattice Boltzmann model is investigated. By the theoretical analysis, it is proved that the model can be regarded as a solver of the Rayleigh–Plesset equation, and confirmed by comparing the results of the lattice Boltzmann simulation and the Rayleigh–Plesset equation calculation for the case of cavitation bubble collapse in the infinite medium field. The bubble collapse near the solid wall is modeled using the improved pseudopotential multi-relaxation-time lattice Boltzmann model. We find the lattice Boltzmann simulation and the experimental results have the same dynamic process by comparing the bubble profiles evolution. Form the pressure field and the velocity field evolution it is found that the tapered higher pressure region formed near the top of the bubble is a crucial driving force inducing the bubble collapse. This exploratory research demonstrates that the lattice Boltzmann method is an alternative tool for the study of the interaction between collapsing cavitation bubble and matter.

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