High-Fidelity Multidisciplinary Design Optimization Methodology with Application to Rotor Blades

Wang, Li ; Diskin, Boris ; Biedron, Robert T ; Neilsen, Eric J ; Sonneville, Valentin ; Bauchau, Olivier A

关键词: AERODYNAMIC LOADS;    COMPUTATIONAL FLUID DYNAMICS;    COST ANALYSIS;    DESIGN OPTIMIZATION;    MULTIDISCIPLINARY DESIGN OPTIMIZATION;    ROTARY WING AIRCRAFT;    SENSITIVITY ANALYSIS;    COMPLEX VARIABLES;    COMPUTATIONAL GRIDS;    FINITE DIFFERENCE THEORY;    PITCHING MOMENTS;    TURBULENT FLOW;    UNSTRUCTURED GRIDS (MATHEMATICS);   

RP-ID  :  NF1676L-27742

学科分类：航空航天科学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

A multidisciplinary design optimization procedure has been developed and applied to rotorcraft simulations involving tightly-coupled, high-fidelity computational fluid dynamics and comprehensive analysis. A discretely-consistent, adjoint-based sensitivity analysis available in the fluid dynamics solver provides sensitivities arising from unsteady turbulent flows on unstructured, dynamic, overset meshes, while a complex-variable approach is used to compute structural sensitivities with respect to aerodynamic loads. The multidisciplinary sensitivity analysis is conducted through integrating the sensitivity components from each discipline of the coupled system. Accuracy of the coupled system for high-fidelity rotorcraft analysis is verified; simulation results exhibit good agreement with established solutions. A constrained gradient-based design optimization for a HART-II rotorcraft configuration is demonstrated. The computational cost for individual components of the multidisciplinary sensitivity analysis is assessed and improved.