Simulations of indoor airflow and particle dispersion and deposition by the lattice Boltzmann method using LES and RANS approaches

2016 ◽  
Vol 102 ◽  
pp. 1-12 ◽  
Author(s):  
H. Sajjadi ◽  
M. Salmanzadeh ◽  
G. Ahmadi ◽  
S. Jafari
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Particle Dispersion ◽  
Indoor Airflow ◽  
Boltzmann Method

Particle Dispersion Simulator for Gel Printer

2014 ◽  
Vol 783-786 ◽  
pp. 2333-2338
Author(s):  
Masato Makino ◽  
M. Hasnat Kabir ◽  
Jin Gong ◽  
Hidemitsu Furukawa
Keyword(s):  
Lattice Boltzmann Method ◽  
Rheological Properties ◽  
Lattice Boltzmann ◽  
Particle Dispersion ◽  
Deformable Particles ◽  
Boltzmann Method ◽  
Dynamics Of Particles

We are developing food printer to design arbitrary shaped foods. The ink for the food printer, injected from nozzle to make foods, is the dispersion of rigid and deformable particles. Simulation for rheological properties and interaction among particles and walls could be one of the important tools to develop the ink for the food printer. We introduce our simulators to investigate the dynamics of particles dispersion. The particles are expressed as Lagrange mesh immersed in fluid. The fluid is solved by Lattice Boltzmann method. The viscosity of the dispersion of the rigid and the deformable particles is shown in this study.

Numerical Study of Angle of Incidence Effect on Particle Deposition Over a Square Cylinder in a Channel Using Lattice-Boltzmann Method

2009 ◽  
Author(s):  
S. Jafari ◽  
M. Salmanzadeh ◽  
M. Rahnama ◽  
G. Ahmadi
Keyword(s):  
Computational Model ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Particle Deposition ◽  
Numerical Study ◽  
Particle Dispersion ◽  
Solid Particles ◽  
Angle Of Incidence ◽  
Square Cylinder ◽  
Boltzmann Method

Particle dispersion and deposition over a square cylinder with different angles of incidence (α = 0°, 45°) in a channel flow was investigated numerically. A computational model using Lattice-Boltzmann Method (LBM) for flow simulation was developed. The interpolated bounce-back (IBB) boundary condition was applied to model the no-slip boundary conditions on curved boundary. The computational model was used to simulate the two-dimensional airflow field in the duct with obstructing square cylinder. A Lagrangian approach was used for simulation of spherical, solid particles suspended in the airflow in the duct. The Reynolds numbers were in the range of laminar. The formation of the von Karman vortex sheet behind the cylinder was predicted by the present LBM simulation. It was shown that the periodicity of the simulated vortex street agrees well with available experimental data. Transport and deposition of 1 μm to 100 μm particles in the duct were studied. The instantaneous flow field was used to evaluate the particle trajectories. The forces included in the particle equation of motion were drag, lift, gravity, and Brownian. The simulation results shows that the particle deposition efficiency decreases when the angle of incidence is increased from 0° to 45° and also more vigorous vortex shedding was observed at α = 45°.

Indoor Airflow Simulation Using Lattice Boltzmann Method

2014 ◽  
Author(s):  
H. Sajjadi ◽  
M. Salmanzadeh ◽  
G. Ahmadi
Keyword(s):  
Numerical Simulation ◽  
Air Quality ◽  
Turbulent Flow ◽  
Lattice Boltzmann Method ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Lattice Boltzmann ◽  
Computational Cost ◽  
Indoor Airflow ◽  
Boltzmann Method

Indoor air quality (IAQ) is very important to human health and comfort as increasingly people spent most of their time in indoor environment. Numerical simulation of indoor airflows has become a significant tool for investigation of the indoor air quality. Cost effective computational methods with reasonable accuracy have the advantage of being more accessible to designers compared to more precise but expensive DNS methods. Recently developed Lattice-Boltzmann Method (LBM) has proved to be a powerful numerical technique for simulating fluid flows in various applications. In comparison with the conventional CFD methods, the advantages of LBM are: simple calculation procedure, simple and efficient implementation for parallel computation, and easy and robust handling of complex geometries. The indoor airflow is typically in turbulent flow regimes. Due to the high costs of more accurate direct numerical simulation (DNS) and large eddy simulation (LES), in this study the Reynolds Averaged Navier-Stokes (RANS) method was used for analyzing the turbulent flow conditions. The RANS governing equations, and in particular, the k-ε turbulence model was incorporated into the Lattice-Boltzmann computational method. The simulation results showed that the combined LBM-RANS provide a reasonably accurate description of the airflow behavior in the room at modest computational cost.

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