A hybrid phase field multiple relaxation time lattice Boltzmann method for the incompressible multiphase flow with large density contrast

2015 ◽  
Vol 77 (9) ◽  
pp. 526-543 ◽  
Author(s):  
J. Y. Shao ◽  
C. Shu
Keyword(s):  
Relaxation Time ◽  
Multiphase Flow ◽  
Lattice Boltzmann Method ◽  
Phase Field ◽  
Lattice Boltzmann ◽  
Density Contrast ◽  
Large Density ◽  
Multiple Relaxation Time ◽  
Boltzmann Method

Three-Dimensional Weighted Multiple-Relaxation-Time Pseudopotential Lattice Boltzmann Method for Multiphase Flow

2021 ◽  
Author(s):  
Jun Tang ◽  
Shengyuan Zhang ◽  
Huiying Wu
Keyword(s):  
Relaxation Time ◽  
Multiphase Flow ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Present Model ◽  
Orthogonal Transformation ◽  
Three Dimensional ◽  
Proposed Model ◽  
Multiple Relaxation Time ◽  
Boltzmann Method

Abstract The pseudopotential lattice Boltzmann (LB) method has been widely used for simulating multiphase flow due to its concise concept and computational simplicity. In this paper, based on the weighted orthogonal transformation matrix, a three-dimensional (3D) weighted multiple-relaxation-time pseudopotential lattice Boltzmann method (WRMT-LBM) is developed, in which the standard lattice stencil D3Q19 is adopted. Compared with the classical multiple-relaxation-time pseudopotential lattice Boltzmann method (CMRT-LBM) based on the orthogonal transformation matrix, the expressions of the equilibrium density distribution function and discrete force term in moment space are simplified in the present model, which contributes to simplifying the program implementation and improving the computational efficiency. Moreover, an additional discrete source term in moment space compatible with the proposed model is introduced to achieve tunable surface tension. A series of numerical tests are then implemented to investigate the performance of the proposed model. Compared with the CMRT-LBM, the results of the present model can achieve lower spurious velocity and higher computational efficiency while keeping comparable accuracy. Furthermore, using the present model, three benchmark cases, including droplet oscillation, droplet impacting on wall and droplet impact on thin film, are performed to investigate the performance of this model. The numerical results are in good agreement with the analytical solutions or the empirical correlations in the literature, which demonstrates that the present model can simulate the multiphase flow with large density ratio.

Unsteady flow simulation using the curvilinear multiple-relaxation-time lattice Boltzmann method: Danube River case study

2019 ◽  
Vol 58 (2) ◽  
pp. 204-217
Author(s):  
Ljubomir Budinski ◽  
Emad Pouryazdanpanah Kermani ◽  
Sanja Ožvat ◽  
Julius Fabian ◽  
Matija Stipić
Keyword(s):  
Relaxation Time ◽  
Unsteady Flow ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Flow Simulation ◽  
Danube River ◽  
Multiple Relaxation Time ◽  
Boltzmann Method ◽  
Unsteady Flow Simulation

Modeling of indoor airflow around thermal manikins by multiple-relaxation-time lattice Boltzmann method with LES approaches

2019 ◽  
Vol 77 (2) ◽  
pp. 215-231
Author(s):  
Xiaojie Cheng ◽  
Ruoyu Su ◽  
Xiong Shen ◽  
Tingxuan Deng ◽  
Delun Zhang ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Indoor Airflow ◽  
Multiple Relaxation Time ◽  
Boltzmann Method
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