Numerical prediction of the slipstream caused by the trains with different marshalling forms entering a tunnel. Issue 189 (June 2019)

• Record Type: Journal Article
• Authors: Jiang, Zhenhua; Liu, Tanghong; Chen, Xiaodong; Li, Wenhui; Guo, Zijian; Niu, Jiqiang
• Is Part Of: Journal of wind engineering and industrial aerodynamics. Issue 189(2019)
• Page Start: 276
• Page End: 288
• Publication Date: 2019-06
• Subjects: High-speed train -- Numerical simulation -- Railway tunnel -- Slipstream -- Marshalling form -- Experiments; Wind-pressure -- Periodicals; Buildings -- Aerodynamics -- Periodicals; Pression du vent -- Périodiques; Constructions -- Aérodynamique -- Périodiques; Buildings -- Aerodynamics; Wind-pressure; Periodicals
• DOI: 10.1016/j.jweia.2019.04.002
• Languages: English
• ISSNs: 0167-6105

Abstract

Abstract: Unsteady Reynolds-averaged Navier–Stokes (URANS) simulations were performed to simulate the flows around three different train types as they enter a tunnel. The three models—a short train, a double train, and a long train—were used to analyze the influence of the train configuration on the surrounding airflows and aerodynamic performance. The numerical predictions showed good agreement with existing experimental data. The maximum positive velocity peak induced by a short train passing through a tunnel was 140% larger than that produced in open air. The amplitudes of the slipstream velocity components decreased as the height from the ground increased. Large differences were found between the velocity fields produced by long and double trains. The velocity field had a large negative peak when a long train traversed the tunnel. This peak grew along the tunnel towards the exit. When a train is running in a double-track tunnel, the airflow above the two tracks moves in opposite directions. The double train induced a 53% higher velocity than the single train, but only a 6% higher velocity than the long train. Highlights: Impact of marshalling length and form on the tunnel slipstream was numerically studied. The train slipstream in the open air and passing through the tunnel has been compared. The three-dimensional slipstream velocities induced by a double train passing the tunnel has been analysed. The mechanisms of the pressures and the slipstream velocities at different locations of the tunnel has obtained.