一种流体-结构耦合计算问题的网格数据交换方法

气动／结构耦合数值模拟是研究非线性气动弹性的基础。数据交换和插值是非线性气动弹性仿真问题的关键。目前的插值方法不能满足非线性气动弹性问题。本提出了一种有限元四节点(FEFN)插值方法。该方法是一种局部插值方法，并不依赖于结构模型带来的整体信息。以圆柱体为具体算例，插值结果与有限平板插值方法(IPS)进行了算例对比，表明FEFN方法更能代表计算物体的表面，且计算简单、计算量小、误差小，是一种适合计算流体力学(CFD)／计算结构动力学(CSD)耦合仿真的界面数据交换工具。

A Suitable Method for Transferring Information Between CFD and CSD Grids

Coupling CFD/CSD is foundation of analyzing nonlinear aeroelasticity. It is very important to choose a coupling CFD/CSD interfacing algorithm that is of high precision, smooth, strongly robust, easy to use and highly efficient. This paper presents and illustrates a new interpolation method for transferring displacement and force data between fluid and structural meshes in a fluid structure interaction simulation. The method is a local interpolation method, and does not rely on whole information from the structural model. Sections 1 and 2 contain: (1) establishment of new FEFN (finite element four node) interpolation scheme(section 1); (2) analysis of effectiveness of FEFN interpolation scheme for transferring information between CFD and CSD grids(section 2); (3) evaluation of the exchange of displacement and force data between fluid and structural meshes for two numerical examples: a cylinder and a wing (section 2); (4) comparison with the infinite plate spline (IPS) method(section 2). Results show that FEFN method gives a more realistic representation of the recovered surface as compared with IPS method. Therefore it is ideal for coupling CFD and CSD.