Turbulent indoor airflow simulation using hybrid LES/RANS model utilizing Lattice Boltzmann method

2017 ◽  
Vol 150 ◽  
pp. 66-73 ◽  
Author(s):  
H. Sajjadi ◽  
M. Salmanzadeh ◽  
G. Ahmadi ◽  
S. Jafari
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Indoor Airflow ◽  
Rans Model ◽  
Boltzmann Method ◽  
Airflow Simulation

Lattice Boltzmann Method Simulation of Turbulent Indoor Airflow Using Hybrid LES/RANS Model

2017 ◽  
Author(s):  
H. Sajjadi ◽  
M. Salmanzadeh ◽  
G. Ahmadi ◽  
S. Jafari
Keyword(s):  
Lattice Boltzmann Method ◽  
Hybrid Model ◽  
Turbulence Model ◽  
Lattice Boltzmann ◽  
Large Scale ◽  
Computational Time ◽  
Wall Region ◽  
Rans Model ◽  
Boltzmann Method ◽  
Near Wall

In this study the hybrid RANS/LES turbulence model within the framework of the Lattice Boltzmann method (LBM) was used to study turbulent indoor airflows. In this approach the near wall region was simulated by the RANS model, while the bulk of the domain was analyzed using the LES model with the LBM approach. In the near wall layer where RANS was used, the k-ε turbulence model was employed. For the k-ε turbulence model in conjunction with the LBM two population balance equations for k and ε were used. The present simulation results for the airflow showed good agreement with the experimental data and the earlier numerical results for the hybrid RANS/LES. The results showed that the hybrid model properly predicted the large scale turbulence fluctuation velocities in the bulk of the flow region. In addition, the computational time for the hybrid model is less than that of the LES method.

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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