粘弹性蜻蜓型翼挥拍的流固耦合求解途径初探

Approach to the fluid- structure interaction on a viscoelastic model dragonfly wing in flapping

昆虫翼挥拍时的动态变形与受到的惯性力和气动力是相互影响的，这是一个复杂的流固耦合过程，本文利用简化的非定常气动力估算方法、简化的昆虫翼结构模型和简化的拍动方式，对该问题的耦合求解途径做了初次探索。首先，在比较了昆虫翼拍动中受到的惯性力和气动力大小的基础上，阐明了耦合求解蜻蜓翼变形过程的必要性。其次，提出一个迭代求解该耦合问题的简化方案，并利用有限元数值模拟了粘弹性蜻蜓模型翼绕定轴往复挥拍的变形过程，比较了耦合气动力前后的模型翼变形，并初步分析了能耗变化。

During the flapping motion of insect wing, its deformation takes place with the action of both inertial and aerodynamic forces, this paper made a primary exploration on this complicated FSI （ Fluid - Structure Interaction） problem, implementing a process consisted of a simplified estimation method for the actea unsteaay aeroaynamtc forces, a simplified structure model of insect wing and a simplified flapping mode. First of all, necessity of resolving the coupled FSI problem was proved out, through comparing values of inertial and aerodynamic forces. Second, an it- erative method was developed to simulate the FSI problem, that is, the process of interaction between the deformation response of viscoelastic dragonfly wing in flapping motion and the action of both inertial and aerodynamic forces, in which both the course deformation and power of the model wing in flapping was analyzed, comparing with that under the action of only inertial force.