There is gas-liquid two-phase flow in pipeline of gas condensate field, corrosion perforation often happens at the bend. Aiming at this phenomenon, using computational fluid dynamics method, according to the laws of fluid flow, a mathematical model of flow induced corrosion was established. Finite element method was used to solve equations. The results show that the flow induced corrosion is closely related to fluid movement;The change of flow rate, liquid distribution, turbulent kinetic energy, pressure and its distribution of multiphase flow through the bend causes change of shear stress, liquid containing rate, turbulent kinetic energy, pressure at internal wall of the bend, which can accelerate pipe’s corrosion. The results provide a guidance for theory study of bend’s flow induced corrosion and multiphase pipelines’ safety management.% 凝析气田管道中含有气液两相，在弯头处经常发生腐蚀穿孔现象。针对这一现象，利用计算流体力学方法，根据流体流动的规律，建立了弯管流动腐蚀的数学模型，运用有限元法来解方程。研究发现弯管的流动腐蚀与流体的运动息息相关，多相流经过弯管后流速、液相分布、湍动能、压力的大小和分布都发生了变化，引起管壁处某些部位剪切应力、含液率、湍动能、压力发生变化，加速了弯管的腐蚀。研究结果可以为弯管流动腐蚀的理论研究和多相混输管道安全管理提供指导。
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