CAJ | 학술논문

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。
이 FLUENT 위연구공구，이용미분방정적수치해법화동망격기술，기우송우합방법장 Newmark 산법통과UDF 감입 Fluent 연건중，실현료 CFD 화 CSD 우합적분석방법。통과건립이유방주요류모형，계산료수향단자유도진동방주재불동풍속하적사탁라합수화최대진폭적변화정황，모의료와격공진쇄정현상，병여정태요류적결과진행료대비。건립료구유수향진동화뉴전진동이자유도적박평판모형，병식별료해평판적전진도수，진일보대기만뉴우합전진림계풍속진행료핍근계산，본방법득도적전진림계풍속여 Scanlan 이론공식화 Selberg 이론공식문합교호。
Taking advantage of the software FLUENT and using the numerical solution of differential equation and the dynamic mesh model,a CFD/CSD coupling solution based on loose coupling was realized by embedding the Newmark method into FLUNT with the help of UDF function.A 2D-square cylinder model was established to investigate the change of Strouhal number and the maximum vertical vortex-excited amplitude of the square cylinder under different wind speed. The lock-in phenomenon of vortex-excited resonance was observed in the process of simulation and it was 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 the flat plate and to determine the flutter critical wind speed of flutter.The simulation result agrees well with the critical wind speeds of flutter calculated by using the Scanlan's formula and Selberg's formula.