Abstract
Direct numerical simulation of compression wave produced when a high-speed train enters a tunnel, distortion of the compression wave front as it travels in the tunnel, radiation of micropressure wave from the tunnel exit are performed using the finite difference lattice Boltzmann method. The discrete Boltzmann equation for the 3D39Q thermal BGK model is solved in three-dimensional space using a second-order Runge-Kutta scheme in time and a third-order-upwind finite difference scheme in space. The arbitrary Lagrangian-Eulerian formulation (ALE) is applied to model the interaction of the moving train nose and the tunnel portal. Detailed numerical calculations were carried out for axisymmetric trains with the blockage of 0.2 and various nose profiles entering a long circular cylindrical tunnel with straight and stepwise flared portals. The predicted compression wave profiles are found to be in good agreement with linear theory predictions obtained from the analytic expression derived by Howe. It is shown that the distortion of the compression wave front is consistent with the time-domain computation of one-dimensional Burgers equation. Longer nose profiles and tunnel entrance with flared portals are confirmed not only to decrease the initial steepness of the compression wave front but also to counteract the effect of nonlinear steepening.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
