Aerodynamic Noise Simulation based on Lattice Boltzmann Method ( Surface Pressure Fluctuations around A-pillar )

The fluid flows and its related aerodynamic noise are very common in the nature and the engineering fieds. Lattice Boltzmann Method (LBM), which is based on the mesoscopic models, is a new CFD approach. It has the congenital superiority and the inestimable development potential in the simulation of complex fluid flow. Referring to the experimental results provided by NASA/CP 2004-212954, the aerodynamic noise produced by the flow through a cavity is simulated by the lattice Boltzmann method. The results had vividly demonstrated the shear layer oscillations, the couple between the shear layer oscillations and cavity resonance pattern. This simulation has discovered that the shear layer oscillation is the main reason for the production of cavity aerodynamic noise. The simulation results are consistent with the NASA experiment data.

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Pore-Scale CO2 Displacement Simulation Based on the Three Fluid Phase Lattice Boltzmann Method

Energy & Fuels ◽

10.1021/acs.energyfuels.9b01918 ◽

2019 ◽

Vol 33 (10) ◽

pp. 10039-10055 ◽

Cited By ~ 1

Author(s):

Mingming Tang ◽

Hongbin Zhan ◽

Shuangfang Lu ◽

Huifang Ma ◽

Hongkun Tan

Keyword(s):

Lattice Boltzmann Method ◽

Lattice Boltzmann ◽

Fluid Phase ◽

Pore Scale ◽

Simulation Based ◽

Boltzmann Method

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Numerical analysis of aerodynamic noise from pantograph in high-speed trains using lattice Boltzmann method

Advances in Mechanical Engineering ◽

10.1177/1687814019863995 ◽

2019 ◽

Vol 11 (7) ◽

pp. 168781401986399 ◽

Cited By ~ 1

Author(s):

Hee-Min Noh

Keyword(s):

Numerical Simulation ◽

Numerical Analysis ◽

Lattice Boltzmann Method ◽

Lattice Boltzmann ◽

High Speed ◽

Aerodynamic Noise ◽

Noise Generation ◽

Noise Sources ◽

High Speed Trains ◽

Boltzmann Method

A pantograph in contact with a catenary for power supply is one of the major aerodynamic noise sources in high-speed trains. To reduce pantograph noise, it is essential to understand the noise generation mechanism of the pantograph. However, it is difficult to determine this mechanism through measurement. Therefore, in this study, the aerodynamic and acoustic performances of a pantograph in a high-speed train were investigated through numerical analysis using the lattice Boltzmann method. First, a real-scaled pantograph was modeled through computer-aided design. Then, the surface and volume meshes of the pantograph model were generated for simulation analysis. Numerical simulation was conducted at a speed of 300 km/h based on the lattice Boltzmann method. Based on the time derivative analysis of flow pressures, it was concluded that the panhead, joint, and base were the dominant noise sources in the pantograph. In particular, various vortexes were generated from the metalized carbon strip of the panhead. The peaks of the sound pressure level propagated from the panhead were 242, 430, and 640 Hz. The noise generation mechanism was analyzed through numerical simulation using noise characteristics.

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Aero-Acoustics Computations of Square Cylinder Using the Lattice Boltzmann Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.444-445.400 ◽

2013 ◽

Vol 444-445 ◽

pp. 400-405

Author(s):

Hai Qing Si ◽

Bing Wang ◽

Yan Shi ◽

Xiao Jun Wu

Keyword(s):

Lattice Boltzmann Method ◽

Lattice Boltzmann ◽

Acoustic Waves ◽

Absorbing Boundary Condition ◽

Aerodynamic Noise ◽

Square Cylinder ◽

Absorbing Boundary ◽

Wall Boundary Conditions ◽

Extrapolation Scheme ◽

Boltzmann Method

In this paper the ability of the Lattice Boltzmann Method (LBM) is investigated for simulating acoustic problems, especially for the propagation of acoustic waves in a wall bounded region. To treat the wall boundary conditions, a non-equilibrium extrapolation scheme for the LBM is adopted. LBM is next applied to simulate the complex aerodynamic noise generated from a square cylinder. In order to efficiently suppress the disturbances at the computational boundaries, the improved absorbing boundary condition (IABC) is developed in this paper. To validate the flow and acoustic solution of a square cylinder, comparisons between the present LBM and the previous studies are carried out. It is demonstrated that the LBM can efficiently simulate the noise generated from a square cylinder.

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