以FLUENT为研究工具,利用微分方程的数值解法和动网格技术,基于松耦合方法将Newmark算法通过UDF嵌入Fluent软件中,实现了CFD和CSD耦合的分析方法。通过建立二维方柱绕流模型,计算了竖向单自由度振动方柱在不同风速下的斯托罗哈数和最大振幅的变化情况,模拟了涡激共振锁定现象,并与静态绕流的结果进行了对比。建立了具有竖向振动和扭转振动二自由度的薄平板模型,并识别了该平板的颤振导数,进一步对其弯扭耦合颤振临界风速进行了逼近计算,本文方法得到的颤振临界风速与Scanlan理论公式和Selberg理论公式吻合较好。
Abstract
Choosing the FLUENT as a tool, using the numerical solution of differential equation and the dynamic mesh model, CFD/CSD coupling solution based on loose coupling was realized by embedding the Newmark method into Fluent by UDF function. A 2D-square cylinder model was established to investigate the change of Strouhal number and maximum vertical vortex-excited amplitude of the square cylinder with wind speed. The lock-in phenomenon of vortex-excited resonance was observed during the simulation and compared with the result of static square cylinder. A 2D flat plate model with vertical and torsional degrees of freedom was established to identify the flutter derivatives of this flat plate and to determine the flutter critical wind speed. The simulation result agrees very well with the wind speeds calculated by the Scanlan’s formula and Selberg’s formula.
关键词
CFD和CSD耦合分析 /
动网格 /
涡激振 /
颤振 /
气弹效应
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Key words
CFD-CSD coupling analysis /
dynamic mesh /
vortex-induced vibration /
flutter /
aeroelastic effect
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