scholarly journals Lattice Boltzmann simulation of liquid–gas flows through solid bodies in a square duct

2006 ◽  
Vol 72 (2-6) ◽  
pp. 264-269 ◽  
Author(s):  
Masato Yoshino ◽  
Yusuke Mizutani
Keyword(s):  
Lattice Boltzmann ◽  
Gas Flows ◽  
Square Duct ◽  
Lattice Boltzmann Simulation ◽  
Solid Bodies

Lattice Boltzmann Simulation of Micro Poiseuille Flow in Curved Rough Channels

2009 ◽  
Author(s):  
Weizhong Li ◽  
Wenning Zhou
Keyword(s):  
Lattice Boltzmann ◽  
Specular Reflection ◽  
Lattice Boltzmann Model ◽  
Solid Boundary ◽  
Gas Flows ◽  
Curved Channel ◽  
Roughness Effect ◽  
Lattice Boltzmann Simulation ◽  
Boltzmann Model ◽  
Bounce Back

This paper studies the roughness effect of the two-dimensional micro Poiseuille gas flows in a curved channel by a modified lattice Boltzmann model. A method relating to the Knudsen number (Kn) with the relaxation time is discussed. In addition, to capture the slip velocity on a solid boundary more accurately, a combined boundary scheme (CBC), which combines the no-slip bounce-back and the free-slip specular reflection schemes, is applied to boundary condition treatment. The rough wall of the micro-channel is described by uniformly distributed rectangular or triangular rough elements. The simulation results show that the roughness and the geometries of the channel have great effects not only on velocity distribution but also on pressure distribution.

A Lattice Boltzmann Simulation of Three-Dimensional Displacement Flow of Two Immiscible Liquids in a Square Duct

2013 ◽  
Vol 135 (12) ◽  
Author(s):  
Prasanna R. Redapangu ◽  
Kirti Chandra Sahu ◽  
S. P. Vanka
Keyword(s):  
Lattice Model ◽  
Lattice Boltzmann ◽  
Three Dimensional ◽  
Flow Dynamics ◽  
Two Dimensional ◽  
Immiscible Liquids ◽  
Square Duct ◽  
Lattice Boltzmann Simulation ◽  
Pressure Driven

A three-dimensional (3D), multiphase lattice Boltzmann approach is used to study a pressure-driven displacement flow of two immiscible liquids of different densities and viscosities in a square duct. A three-dimensional, 15-velocity (D3Q15) lattice model is used. The effects of channel inclination, viscosity, and density contrasts are investigated. The contours of the density and the average viscosity profiles in different planes are plotted and compared with those obtained in a two-dimensional (2D) channel. We demonstrate that the flow dynamics in a 3D channel is quite different as compared to that of a 2D channel. We found that the flow is relatively more coherent in a 3D channel than that in a 2D channel. A new screw-type instability is seen in the 3D channel that cannot be observed in the 2D channel.

Thermal Lattice Boltzmann Simulation of Rarefied Gas Flows in Nanochannels for Wide Range of Knudsen Number

2011 ◽  
Vol 403-408 ◽  
pp. 5313-5317
Author(s):  
A.H. Meghdadi Isfahani ◽  
A. Soleimani
Keyword(s):  
Lattice Boltzmann ◽  
Rarefied Gas ◽  
Gas Flows ◽  
Rarefied Gas Flows ◽  
Knudsen Numbers ◽  
Lattice Boltzmann Simulation ◽  
Wide Range ◽  
Flow Through ◽  
Boltzmann Method ◽  
Thermal Lattice Boltzmann

Using a modified Lattice Boltzmann Method (LBM), developing thermal flow through micro and nano channels has been modeled. Based on the improving of the dynamic viscosity and thermal conductivity, an effective relaxation time formulation is proposed which is able to simulate wide range of Knudsen numbers, Kn,. The results show that in spite of the standard LBM, the temperature distributions and the local Nusselt number obtained from this modified thermal LBM, agree well with the other numerical and empirical results in a wide range of Knudsen numbers.

Sign in / Sign up

Export Citation Format

Share Document