Using Adjoint-Based Method for the Understanding and Optimization in Flexible Flapping Wings

题  目：Using Adjoint-Based Method for the Understanding and Optimization in Flexible Flapping Wings
报告人：Mingjun Wei (魏明骏)
时  间：2014年5月28日 （周三）上午9:30
地  点：力学一楼239

报告摘要：
The study of flexible flapping wings of natural flyers and micro air vehicles remains challenging by the problem's unsteadiness, nonlinearity, moving boundary, and strong fluid-structure interaction. Here, we take a different route by driving directly to an optimal solution, which can, in return, provide a unique opportunity for understanding by its comparison to the initial or other performance status. With the large control space of the current problem, adjoint-based approach is a natural choice for its cost being independent of the number of control parameters. However, when unsteady flapping motion and deformation is considered, traditional adjointbased approach used commonly in airfoil design falls short of even the definition of sensitivity at the moving/morphing boundary. Using unsteady mapping function could, in principle, be a remedy, but its formulation is often too complex to be feasible. Instead, we implement the idea of noncylindrical shape analysis to derive an adjoint-based continuous approach in a rigorous and simple manner particularly for the optimization in moving boundary problems. At the end, the application of our approach to a pitching-plunging plate not only shows the algorithm efficiency but also reveals the mechanism behind the improvement of aerodynamic performance from some subtle changes.

报告人简介：
Dr. Ming-Jun Wei (魏明骏) is now Associate Professor of Department of Mechanical and Aerospace Engineering in New Mexico State University . Dr.Wei  received his B.S from USTC, and Ph.D from Univ. of Illinois at Urbana-Champaign. His research areas are computational fluid dynamics, fluid-structure interaction, model reduction, control and optimization, aero-coustics. He is member of AIAA, APS, SIAM, ASEE, relevant academic papers have been published on top journals in fluid mechanics like J. Fluid Mech.and Phys. Fluids etc.

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