Methods for calculating aerodynamics inside high-speed railway tunnel lining cracks and predicating stress intensity factors
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 18 August 2023
Issue publication date: 22 November 2023
Abstract
Purpose
This study aims to propose a series of numerical and surrogate models to investigate the aerodynamic pressure inside cracks in high-speed railway tunnel linings and to predict the stress intensity factors (SIFs) at the crack tip.
Design/methodology/approach
A computational fluid dynamics (CFD) model is used to calculate the aerodynamic pressure exerted on two cracked surfaces. The simulation uses the viscous unsteady κ-ε turbulence model. Using this CFD model, the spatial and temporal distribution of aerodynamic pressure inside longitudinal, oblique and circumferential cracks are analyzed. The mechanism behind the pressure variation in tunnel lining cracks is revealed by the air density field. Furthermore, a response surface model (RSM) is proposed to predict the maximum SIF at the crack tip of circumferential cracks and analyze its influential parameters.
Findings
The initial compression wave amplifies and oscillates in cracks in tunnel linings, resulting from an increase in air density at the crack front. The maximum pressure in the circumferential crack is 2.27 and 1.76 times higher than that in the longitudinal and oblique cracks, respectively. The RSM accurately predicts the SIF at the crack tip of circumferential cracks. The SIF at the crack tip is most affected by variations in train velocities, followed by the depth and length of the cracks.
Originality/value
The mechanism behind the variation of aerodynamic pressure in tunnel lining cracks is revealed. In addition, a reliable surrogate model is proposed to predict the mechanical response of the crack tip under aerodynamic pressures.
Keywords
Acknowledgements
CrediT authorship contribution statement: Yi-Kang Liu: investigation, software, validation, writing original draft. Xin-Yuan Liu: methodology, software, writing review and editing. E. Deng: funding acquisition, methodology, data curation, writing review and editing, supervision. Yi-Qing Ni: funding acquisition, writing review and editing. Huan Yue: writing review and editing.
Declaration of competing interest: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
This work was funded by the Fundamental Research Funds for the Central Universities of Central South University [grant number 2023ZZTS0369], the Research Grants Council, University Grants Committee of the Hong Kong Special Administrative Region (SAR), China [grant number R-5020-18], the Innovation and Technology Commission of the Hong Kong SAR Government [grant number K-BBY1] and The Hong Kong Polytechnic University’s Postdoc Matching Fund Scheme [grant number 1-W21Q].
Citation
Liu, Y.-K., Liu, X.-Y., Deng, E., Ni, Y.-Q. and Yue, H. (2023), "Methods for calculating aerodynamics inside high-speed railway tunnel lining cracks and predicating stress intensity factors", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 33 No. 12, pp. 3895-3914. https://doi.org/10.1108/HFF-03-2023-0115
Publisher
:Emerald Publishing Limited
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