Three Dimensional Numerical Analysis of Tunnel Inrushing Wave

当高速列车冲入隧道时，隧道口附近会产生压力波，即隧道涌波。本研究的目的是分析隧道中心与轨道之间的偏移以及隧道入口周围的地形对波发射的影响。建立了CIP法分析目标的三维计算机模拟系统。利用该系统对一个简单的高速列车冲入隧道排放模型进行了计算。该系统分为模拟列车突入隧道的流体分析系统和模拟突入波发射的声学分析系统。理论计算与仿真结果在距离衰减方面的差异表明，系统在守恒律方面存在问题。

When a high speed train inrushes a tunnel, pressure wave is emitted around the tunnel entrance as Tunnel Inrushing Wave. An objective of this research is to analysis influences on the emission of the wave by offset between the tunnel centre and rail way and by landform around the tunnel entrance. A three dimensional computer simulation system for analysis the objective was set up with CIP method. A simple model of emission by rush of high speed train into a tunnel was calculated by the system. The system split into fluid analysis system to simulate inrushing of train into tunnel and acoustic analysis system to simulate emission of inrushing wave. A difference of distance attenuation between a theory and results of simulation made clear that the systems have problems in conservation rule.