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Journal of Vibration Testing and System Dynamics 8(1) (2024) 15--31 | DOI:10.5890/JVTSD.2024.03.002

Tao Di$^{1}$, Xu Sun$^{1}$, Shun Zhou$^{2}$, Jun Xiao$^{3}$, Dongying Wang$^{2}$, Yue Shu$^{3}$, Lingren Yu$^{2}$,\\ Jiaxing Sun$^{2}$, Yuxuan Wu$^{2}$, Zifeng Yu$^{4}$, Hong Zhang$^{1}$

$^{1}$ National Engineering Laboratory for Pipeline Safety, China University of Petroleum-Beijing, Beijing, 102249,

China

$^{2}$ Pipe China Beijing Gas pipeline Company, Beijing, 100101, China

$^{3}$ State Key Laboratory of Compressor Technology/Compressor Technology Laboratory of Anhui Province, Hefei,

Anhui, 230031, China

$^{4}$ China Oil & Gas Pipeline Network Corp, Beijing, 100013, China

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Abstract

Gas transmission pipeline vibration is mostly caused by gas flow fluctuation, and the disturbance of the gas flow through the tee junction pipes is one of the reasons for the large gas flow fluctuation. Large Eddy simulation (LES) method is applied to gas flow fluctuation in tee junction pipes in this paper. Firstly, the models of numerical simulation and the geometric parameters are displayed, in addition to the governing equations of compressible flow in LES. Subsequently, accuracy and applicability of LES method for compressible internal flow problem are validated and the optimal subgrid-scale (SGS) model, DSM SGS model, was selected by comparing the reference values with the values calculated of each of the SGS models. Finally, to reveal how the gas flow fluctuation in tee junction pipe (or with a blind end) vary with the influencing factors, LES method and DSM SGS model are applied to simulate the flow of compressible fluid (methane) in the tee junction pipes. The influencing factors are flow velocity and branch internal diameter, and in the case of tee junction pipes with a blind end, branch length is also taken into account.

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