Abstract A thin-walled beam model is proposed for structures of variable cross-section, which can be either open or closed and includes multicellular cross-sections with either isotropic or orthotropic materials. The proposed model does not require any priori definition of cross-sectional warping which instead results from the solution of the problem. To achieve that a special deformation pattern is superimposed on the bending deformation described by Euler–Bernoulli beam theory. All sectional properties are automatically incorporated in the analysis as a result of the usual variational formulation of the system of equations. The proposed model is specifically designed to simulate the dynamics of wind/hydrokinetic turbine blade with low computational cost, especially in fluid–structure interaction (FSI) simulation. A number of test cases have been carried out to validate the proposed structural model which show good agreement between the results obtained her e and the solutions available in literature. Finally, FSI simulation of a hydrokinetic blade under field condition is carried out to illustrate the capability of the current thin-walled beam model in practice.

中文翻译：

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轻量化结构与流体相互作用的薄壁复合梁模型

摘要 针对可变截面结构提出了一种薄壁梁模型，该模型可以是开放的或封闭的，包括具有各向同性或正交各向异性材料的多单元截面。所提出的模型不需要任何横截面翘曲的先验定义，而是由问题的解决方案产生的。为了实现这一点，在欧拉-伯努利梁理论描述的弯曲变形上叠加了一种特殊的变形模式。作为方程组的常用变分公式的结果，所有截面属性都会自动包含在分析中。所提出的模型专门设计用于以低计算成本模拟风/水动力涡轮叶片的动力学，特别是在流固耦合 (FSI) 模拟中。已经进行了许多测试案例来验证所提出的结构模型，这些模型显示了在她获得的结果与文献中可用的解决方案之间的良好一致性。最后，在现场条件下进行了流体动力叶片的 FSI 模拟，以说明当前薄壁梁模型在实践中的能力。