scholarly journals Equilibrium distribution boundary condition in lattice Boltzmann model and numerical simulation of Darcy-Forcheimer drag for fluid flow across a square cylinder array

2007 ◽  
Vol 56 (3) ◽  
pp. 1238
Author(s):  
Feng Shi-De ◽  
Zhong Lin-Hao ◽  
Gao Shou-Ting ◽  
Dong Ping
Keyword(s):  
Numerical Simulation ◽  
Boundary Condition ◽  
Fluid Flow ◽  
Lattice Boltzmann ◽  
Equilibrium Distribution ◽  
Lattice Boltzmann Model ◽  
Square Cylinder ◽  
Cylinder Array ◽  
Distribution Boundary ◽  
Boltzmann Model

Study of the Mixed Convection in a Horizontal Channel Heated from below

2015 ◽  
Vol 789-790 ◽  
pp. 398-402
Author(s):  
N. Mahfoud Sahraoui ◽  
Samir Houat ◽  
Nawal Saidi
Keyword(s):  
Numerical Simulation ◽  
Reynolds Number ◽  
Mixed Convection ◽  
Lattice Boltzmann ◽  
Thermal Field ◽  
Lattice Boltzmann Model ◽  
Horizontal Channel ◽  
Comparison Of The Results ◽  
Stretching Ratio ◽  
Boltzmann Model

In this work, a contribution to the modeling and numerical simulation of mixed convection in a horizontal channel heated from below is presented. The lattice Boltzmann model with double thermal populations (TLBM) is used with the D2Q9 model for the dynamic field and D2Q5 for the thermal field. A comparison of the results obtained by the lattice Boltzmann model with those of the literature is presented for an area stretching ratio B = H / L = 20, a Reynolds number Re = 10, Rayleigh Ra = 104 and Peclet number Pe = 20/3. The streamlines and isotherms are presented for different periods of flow.

Modelling of Flow Around a Square Cylinder of Different Roughness Using a Lattice Boltzmann Model

2009 ◽  
Author(s):  
M. S. Alam ◽  
Liang Cheng
Keyword(s):  
Lattice Boltzmann ◽  
Lattice Boltzmann Model ◽  
Square Cylinder ◽  
Flow Parameters ◽  
Roughness Elements ◽  
Vortex Shedding Frequency ◽  
Shedding Frequency ◽  
Pipe Roughness ◽  
Boltzmann Model ◽  
Circumferential Pressure

A Lattice Boltzmann model is developed to simulate flow around a square cylinder of different roughness heights. It is evident from this study that the influences of pipe roughness on the flow parameters are quite noteworthy. It is revealed that the circumferential pipe roughness has significant influences on the hydrodynamic forces, circumferential pressure distribution, vortex shedding frequency and the formation of vortices in the vicinity of cylinder. In addition, it is seen that the orientation of the roughness elements or the density of the roughness elements does not have significant influence on the flow parameters.

Impedance Boundary Condition for Lattice Boltzmann Model

2013 ◽  
Vol 13 (3) ◽  
pp. 757-768 ◽  
Author(s):  
Chenghai Sun ◽  
Franck Pérot ◽  
Raoyang Zhang ◽  
David M. Freed ◽  
Hudong Chen
Keyword(s):  
Boundary Condition ◽  
Lattice Boltzmann ◽  
Complex Geometry ◽  
Lattice Boltzmann Model ◽  
Impedance Boundary Condition ◽  
Normal Velocity ◽  
Flow Tube ◽  
Impedance Boundary ◽  
Grazing Flow ◽  
Boltzmann Model

AbstractA surface based lattice Boltzmann impedance boundary condition (BC) using Ozyoruk’s model [J. Comput. Phys., 146 (1998), pp. 29-57] is proposed and implemented in PowerFLOW. In Ozyoruk’s model, pressure fluctuation is directly linked to normal velocity on an impedance surface. In the present study, the relation between pressure and normal velocity is realized precisely by imposing a mass flux on the surface. This impedance BC is generalized and can handle complex geometry. Combined with the turbulence model in the lattice Boltzmann solver PowerFLOW, this BC can be used to model the effect of a liner in presence of a complex 3D turbulent flow. Preliminary simulations of the NASA Langley grazing flow tube and Kundt tube show satisfying agreement with experimental results.

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