改进的CFD/CSD耦合系统设计方法及其计算

论述了界面上的数据交换方法和时间推进格式在流体动力学（CFD）和结构动力学（CSD）耦合求解非线性气动弹性问题中的关键作用；改进了CFD／CSD耦合系统．包括基于边界元方法设计了CFD和CSD耦合界面的数据转换方法，该方法可在同一映射矩阵处理结构响应和非定常气动载荷转换，保证了耦合边界上的能量守恒；改进了一种松耦合方法流程，在保持模块化基础上提高了计算精度和效率。最后将本文方法应用于二维位移外插算例和A—GARD445．6机翼的动响应分析中，结果表明本文方法具有较高精度。

IMPROVED ALGORITHM FOR CFD/CSD COUPLED SYSTEM DESIGN AND CALCULATION

The data information transfer and time marching strategies between computational fluid dynamics (CFD) and computational structural dynamics (CSD) play crucial roles on the aeroelastic analysis in a time domain. An improved CFD/CSD coupled system is designed, including an interpolation method and an improved loosely coupled algorithm. The interpolation method based on boundary element method (BEM) is developed to transfer aerodynamic loads and structural displacements between CFD and CSD grid systems, it can be universally used in fluid structural interaction solution by keeping energy conservation. The improved loosely coupled algorithm is designed, thus it improves the computational accuracy and efficiency. The new interface is performed on the two-dimensional (2-D) extrapolation and the aeroelastic response of AGARD445. 6 wing. Results show that the improved interface has a superior accuracy.