基于FlUent二次开发研究高速列车通过隧道时的瞬变压力

研究目的:针对采用通用CFD软件Fluent进行高速列车隧道空气动力学效应数值模拟中存在的问题,对 以Fluent为平台、利用VC 语言进行二次开发的一些关键性技术进行了研究。 研究方法:本文采用三维粘性、小等熵、可压缩、非定常流的Navier-Stokes方程,用有限体积法进行区域离 散,对高速列车通过隧道时隧道内和列车内外瞬变压力的变化进行了三维数值模拟。 研究结果:将隧道内瞬变压力的波动情况与列车的运行情况相结合,对此过程进行了详细的描述和解释。 研究结论:计算过程中,Fluent的命令流能灵活地实现CFD分析中的众多相关功能,为工程设计和研究提 供了有力的开发平台和分析工具。Fluent不仅具有完备的系统开放性,还可利用C语言编制自己的程序模块来 丰富其功能,在工程上有着非常广阔的应用前景。

ANALYSIS OF TRANSIENT PRESSURE INDUCED BY HIGH-SPEED TRAIN PASSING A TUNNEL BASED ON THE SECOND DEVELOPMENT OF FLUENT

Research purpose:Based on the second development of Fluent which is a powerful CFD analysis software,some important techniques are discussed on the problems in numerical simulation of aerodynamic effect produced by high-speed train passing a tunnel on Fluent system.The problems can be solved by the method of programming with VC . Research method:This paper presents a cell-centered finite volume scheme for numerical integration of Navier- Stokes equations for three -dimensional unsteady viscous compressible non -homentropic flow to simulate the variation of transient pressure in tunnel,inside and outside the train introduced by high -speed train passing through a tunnel. Research result:The transient pressure curve is analysed and explained in detail in accord with the train positions. Research conclusion:The calculated results are useful in designing new -style portals of high -speed railway tunnels and vehicle sealing performance of high-speed train.