Abstract When a train passes through a tunnel at a high speed, it will induce a pressure fluctuation inside and outside of the tunnel, including a pressure wave inside the tunnel and another at the tunnel entrance/exit. In a numerical simulation of these two aerodynamic phenomena, the selection of open boundary conditions and boundary conditions at the exit portal were critical. Based on a 3D compressible unsteady turbulence flow model, the sliding mesh technique of the CFD code was adopted to simulate the entire process of a high-speed train passing through a tunnel. The impacts on the calculation results for pressure waves inside the tunnel and at the tunnel entrance/exit induced by changing the open boundary conditions and the exit boundary conditions in two calculation domains were studied. The results show that the open boundary condition has a major impact on the wave at the tunnel entrance, as does the exit boundary condition on the tunnel pressure wave. Riemann boundary conditions are appropriate for the open boundary while studying the wave at the entrance/ exit, and the pressure boundary conditions are appropriate for the exit boundary while studying the tunnel pressure wave.
Abstract��
When a train passes through a tunnel at a high speed, it will induce a pressure fluctuation inside and outside of the tunnel, including a pressure wave inside the tunnel and another at the tunnel entrance/exit. In a numerical simulation of these two aerodynamic phenomena, the selection of open boundary conditions and boundary conditions at the exit portal were critical. Based on a 3D compressible unsteady turbulence flow model, the sliding mesh technique of the CFD code was adopted to simulate the entire process of a high-speed train passing through a tunnel. The impacts on the calculation results for pressure waves inside the tunnel and at the tunnel entrance/exit induced by changing the open boundary conditions and the exit boundary conditions in two calculation domains were studied. The results show that the open boundary condition has a major impact on the wave at the tunnel entrance, as does the exit boundary condition on the tunnel pressure wave. Riemann boundary conditions are appropriate for the open boundary while studying the wave at the entrance/ exit, and the pressure boundary conditions are appropriate for the exit boundary while studying the tunnel pressure wave.
WANG ,
RUI ,
Mei-Yuan-Gui etc
.Study of Boundary Conditions for the Numerical Simulation of Pressure Fluctuation Inside and Outside of a High-Speed Railway Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(3): 117-123
2014, Vol. 51 