scholarly journals Lattice Boltzmann Numerical Approach to Predict Macroscale Thermal Fluid Flow Problem

10.5772/13822 ◽  
2011 ◽  
Author(s):  
Nor Azwadi Che Sidik ◽  
Syahrullail Samio
Keyword(s):  
Fluid Flow ◽  
Lattice Boltzmann ◽  
Flow Problem ◽  
Numerical Approach ◽  
Thermal Fluid Flow

Topology optimization in thermal-fluid flow using the lattice Boltzmann method

2016 ◽  
Vol 307 ◽  
pp. 355-377 ◽  
Author(s):  
Kentaro Yaji ◽  
Takayuki Yamada ◽  
Masato Yoshino ◽  
Toshiro Matsumoto ◽  
Kazuhiro Izui ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Topology Optimization ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Thermal Fluid Flow ◽  
Boltzmann Method

Numerical Prediction of Natural Convection Heat Transfer through Porous Media by the Lattice Boltzmann Method

2011 ◽  
Vol 110-116 ◽  
pp. 4439-4444
Author(s):  
Irwan Mohd Azmi Mohd ◽  
Nor C. Sidik Azwadi
Keyword(s):  
Fluid Flow ◽  
Rayleigh Number ◽  
Lattice Boltzmann ◽  
Stokes Equations ◽  
Flow Behavior ◽  
Convection Heat Transfer ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Medium Porosity ◽  
Thermal Fluid Flow

In this paper, we report an efficient numerical method to predict thermal fluid flow behavior in a square cavity filled with porous medium. The conventional Navier-Stokes equations are solved indirectly, i.e by the lattice Boltzmann formulation with second order accuracy in space and time. Numerical experiments were performed with different values of medium porosity and Rayleigh number to investigate the effect of these dimensionless parameters on the thermal fluid flow behavior in the cavity. In the current study, we found that the dynamics and the structure of primary vortex are significantly affected by the Rayleigh number and the medium porosity.

The Fluctuating Lattice Boltzmann

2018 ◽  
Author(s):  
Sauro Succi
Keyword(s):  
Brownian Motion ◽  
Fluid Flow ◽  
Lattice Boltzmann ◽  
Thermal Fluctuations ◽  
Directed Motion ◽  
Statistical Fluctuations ◽  
Lattice Boltzmann Models ◽  
Motion Versus ◽  
The Way

Fluid flow at nanoscopic scales is characterized by the dominance of thermal fluctuations (Brownian motion) versus directed motion. Thus, at variance with Lattice Boltzmann models for macroscopic flows, where statistical fluctuations had to be eliminated as a major cause of inefficiency, at the nanoscale they have to be summoned back. This Chapter illustrates the “nemesis of the fluctuations” and describe the way they have been inserted back within the LB formalism. The result is one of the most active sectors of current Lattice Boltzmann research.

Effect of Slit Inclusions in Drag Reduction of Flow over Cylinders

2016 ◽  
Vol 846 ◽  
pp. 18-22
Author(s):  
Rohit Bhattacharya ◽  
Abouzar Moshfegh ◽  
Ahmad Jabbarzadeh
Keyword(s):  
Fluid Flow ◽  
Drag Reduction ◽  
Drag Coefficient ◽  
Finite Volume ◽  
Lattice Boltzmann ◽  
Circular Cross Section ◽  
Finite Volume Methods ◽  
Turbulent Regime ◽  
Ansys Fluent ◽  
Comparison Of The Results

The flow over bluff bodies is separated compared to the flow over streamlined bodies. The investigation of the fluid flow over a cylinder with a streamwise slit has received little attention in the past, however there is some experimental evidence that show for turbulent regime it reduces the drag coefficient. This work helps in understanding the fluid flow over such cylinders in the laminar regime. As the width of the slit increases the drag coefficient keeps on reducing resulting in a narrower wake as compared to what is expected for flow over a cylinder. In this work we have used two different approaches in modelling a 2D flow for Re=10 to compare the results for CFD using finite volume method (ANSYS FLUENTTM) and Lattice Boltzmann methods. In all cases cylinders of circular cross section have been considered while slit width changing from 10% to 40% of the cylinder diameter. . It will be shown that drag coefficient decreases as the slit ratio increases. The effect of slit size on drag reduction is studied and discussed in detail in the paper. We have also made comparison of the results obtained from Lattice Boltzmann and finite volume methods.

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