计算气动弹性力学中的界面映射方法研究

非线性气动弹性体振动研究中,涉及到非线性的结构动力学和非线性的流体动力学耦合问题,在耦合边界上要满足两个系统的连续性相容条件,必须在边界处进行数据的交换。本文针对非线性气动弹性问题的计算流体动力学(CFD)和计算结构动力学(CSD)的耦合计算方法,在常体积转换法(CVT)的基础上,发展了一种耦合界面的数据映射矩阵(IMM)。该方法仅需要局部的网格信息,将耦合边界上载荷信息和位移信息的转换放在同一个映射矩阵中来处理,并且该矩阵可以通用求解CFD/CSD的耦合问题,克服了占用大量CPU时间和内存的弊端。最后将该界面映射方法应用于柔性大展弦比机翼的气动弹性计算和AGARD445.6机翼的颤振预测中,结果表明该方法能够高效、高精度地处理不同网格体系间的数据交换,并具有处理复杂非规则几何体信息转换的能力。

A new interface mapping method for aeroelasticity

Computational structural dynamics(CSD) and Computational fluid dynamics(CFD) referring to aeroelasticity are highly nonlinear problems in the time domain,the data information transfer between the different disciplines plays a crucial role in coupling system.In this study,a new interpolation method,named as Interface Mapping Matrix(IMM) based on CVT(conservation volume transformation) is developed to match the two grid systems.This method only needs the local grid information,and can transform structural displacements and aerodynamic loads by one matrix and its transpose which can be used universally in Fluid Structural Interaction case.Consequently,it can overcome requirement of a huge amount of CPU time and memory.The results for static aeroelasticity test of flexible high aspect ratio wing and flutter prediction of AGARD445.6 wing illustrate that the method can transform information in efficient and accurate way,and it is able to deal with more irregular and complex geometries.