Multi-component LBM-LES model of the air and methane flow in tunnels and its validation

Li, Chengwu; Zhao, Yuechao; Ai, Dihao; Wang, Qifei; Peng, Zhigao; Li, Yingjun

doi:10.1016/j.physa.2020.124279

Cited by 10 publications

(3 citation statements)

References 66 publications

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“…The large-eddy-simulation lattice Boltzmann method is another way to improve the numerical stability from the original lattice Boltzmann method. For high Reynolds number turbulence flows, it is important to choose a reasonable turbulence model of numerical simulation, according to Krafczyk [30], Dong [31], Rahmati [32], and Chengwu [33]. Three turbulent models can be coupled with LBM, which are Direct Numerical Simulation (DNS), Large Eddy Simulation (LES), and Reynolds Average Navier-Stokes (RANS), respectively.…”

Section: Large-eddy-simulation Lattice Boltzmann Methodsmentioning

confidence: 99%

Large Eddy Simulation of the Inlet Cross-Flow in the CiADS Heat Exchanger Using the Lattice Boltzmann Method

Liu,

Wang,

Wang

et al. 2023

Sustainability

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The liquid lead-bismuth eutectic (LBE) is the coolant of the heat exchanger in China initiative Accelerator Driven System, which may have a risk of structural failure due to the washout of the coolant in the inlet of the heat exchanger. It is necessary to study the mechanical properties of the heat exchanger bundles of CiADS, especially the fatigue life of the bundle structure in the transverse flow of the LBE. The numerical simulation is the Lattice Boltzmann method combined with the large eddy simulation by Python codes. The velocity distribution of the flow field and the time domain characteristics of the heat exchanger bundles’ force are calculated, and the frequency domain characteristics of the heat exchanger bundles’ vibration are obtained by Fourier transform. The bundles vibrate at high cycle fatigue in turbulent flow at high Reynolds number. The transverse flow of LBE does not affect the fatigue life of the bundle. No structural failure occurs in the CiADS heat exchanger due to the transverse flow of LBE.

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Section: Large-eddy-simulation Lattice Boltzmann Methodsmentioning

confidence: 99%

Large Eddy Simulation of the Inlet Cross-Flow in the CiADS Heat Exchanger Using the Lattice Boltzmann Method

Liu,

Wang,

Wang

et al. 2023

Sustainability

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“…The results showed that local jet fans could effectively eliminate the "dead zone" ahead of the crossaisle. Fang et al [25] investigated the airflow near the work face by constructing CFD models and predicted the gas distribution in a gas tunnel structure. Li et al [26] developed a multicomponent Lattice Boltzmann Method (LBM)-Large Eddy Simulation (LES) model to simulate methane flow in tunnels and conducted a reduced-scale tracer gas experiment to validate the numerical analysis.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analyses of methane leakage in shield tunnel

He,

Zhu,

Wei

et al. 2023

Front. Struct. Civ. Eng.

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Tunnels constructed in gas-bearing strata are affected by the potential leakage of harmful gases, such as methane gas. Based on the basic principles of computational fluid dynamics, a numerical analysis was performed to simulate the ventilation and diffusion of harmful gases in a shield tunnel, and the effect of ventilation airflow speed on the diffusion of harmful gases was evaluated. As the airflow speed increased from 1.8 to 5.4 m/s, the methane emission was diluted, and the methane accumulation was only observed in the area near the methane leakage channels. The influence of increased ventilation airflow velocity was dominant for the ventilation modes with two and four fans. In addition, laboratory tests on methane leakage through segment joints were performed. The results show that the leakage process can be divided into “rapid leakage” and “slight leakage”, depending on the leakage pressure and the state of joint deformation. Based on the numerical and experimental analysis results, a relationship between the safety level and the joint deformation is established, which can be used as guidelines for maintaining utility tunnels.

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“…[27,28] Based on this theory, many efforts have been devoted to exploring the flow of binary mixtures. [29] At the same time, Zhang et al extended the discrete unified gas kinetic scheme towards the study of flows in binary gas mixtures. [30] The self-collision term found in the abovementioned literature adopts the SRT or Bhatnagar-Gross-Krook (BGK) model.…”

Section: Introductionmentioning

confidence: 99%

Effect of viscosity on stability and accuracy of the two-component lattice Boltzmann method with a multiple-relaxation-time collision operator investigated by the acoustic attenuation model

Bai¹,

Shan²,

Yang³

et al. 2022

Chinese Phys. B

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A two-component lattice Boltzmann method (LBM) with a multiple-relaxation-time (MRT) collision operator is presented to improve the numerical stability of the single relaxation time (SRT) model. The macroscopic and the momentum conservation equations can be retrieved through the Chapman-Enskog (C-E) expansion analysis. The equilibrium moment with the diffusion term is calculated, a diffusion phenomenon is simulated by utilizing the developed model, and the numerical stability is verified. Furthermore, the binary mixture channel model is designed to simulate the sound attenuation phenomenon, and the obtained simulation results are found to be consistent with the analytical solutions. The sound attenuation model is used to study the numerical stability and calculation accuracy of the LBM model. The simulation results show the stability and accuracy of the MRT model and the SRT model under different viscosity conditions. Finally, we study the influence of the error between the macroscopic equation of the MRT model and the standard incompressible Navier–Stokes equation on the calculation accuracy of the model to demonstrate the general applicability of the conclusions drawn by the sound attenuation model in the present study.

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Multi-component LBM-LES model of the air and methane flow in tunnels and its validation

Cited by 10 publications

References 66 publications

Large Eddy Simulation of the Inlet Cross-Flow in the CiADS Heat Exchanger Using the Lattice Boltzmann Method

Large Eddy Simulation of the Inlet Cross-Flow in the CiADS Heat Exchanger Using the Lattice Boltzmann Method

Numerical and experimental analyses of methane leakage in shield tunnel

Effect of viscosity on stability and accuracy of the two-component lattice Boltzmann method with a multiple-relaxation-time collision operator investigated by the acoustic attenuation model

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