振动桥梁CFD数值模拟的网格运动算法

Grid Movement Algorithms in CFD for Numerical Simulation of Bridge Vibration

针对非流线型桥梁断面模型,采用Delaunay背景网格方法、棱边弹簧及线性弹簧网格方法,研究非结构网格与结构网格条件下,计算域网格运动的特点及算法优劣.研究表明,在正常的桥梁断面振动振幅内,三种网格运动方法均能保持网格变形时不会失效,其中Delaunay背景网格方法耗时最少,线性弹簧网格方法获得网格质量最高;在大振幅状态下,结构化网格容易失效,线性弹簧网格方法可最大限度保证网格有效.

Delaunay background grid,edge spring grid and linear spring grid are used to study computational domain grid movement on non-structural grid and structure grid for non-streamlined bridge section.It shows that the methods are effective as grid deformation within a normal vibration amplitude of the bridge section.Delaunay grid background method consumes the least time and the linear spring grid method obtains the highest quality.It also shows that with large amplitudes,structural grid is invalid easily and linear spring grid method ensures effectively.