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Numerical Investigation on Fluid-Structure Interaction between Tunnel Piston Wind and Platform Screen Doors in Metro Systems

• 1、School of Urban Rail Transportation,Shanghai University of Engineering Science,201620

Abstract：The subway system serves as the core infrastructure of urban mass transit, and its safe and stable operation is vital to both passenger safety and the orderly functioning of urban transportation. Platform screen doors (PSDs) play a crucial role in ensuring passenger safety and maintaining train operations. Malfunctions during the door-closing process can lead to train delays and amplify the tunnel piston wind effect, forming a detrimental cycle of "PSD malfunction, train detention, intensified piston wind, further failures." In this study, a coupled Eulerian-Lagrangian (CEL) approach is employed to analyze the transient fluid-structure interaction between tunnel airflow and the PSDs. The evolution of the transient airflow inside the tunnel is captured using the Eulerian domain\'s volume fraction field, while the door structure is modeled with Lagrangian elements to directly obtain the time-dependent distributions of flow field and structural response. The results vividly reproduce the jetting, diffusion, vortex formation, and pressure concentration occurring during the door-gap contraction phase, and identify regions of localized stress concentration and out-of-plane deformation, providing theoretical guidance for the sealing, reinforcement, and drive design of platform screen doors.

Keywords： Tunnel piston wind Platform screen door Fluid-structure interaction Subway