Rapid Solution and Variable-fidelity Modeling of Aeroelasticity(AE) /Aeroservoelasticity (ASE) Using ASTE-P Toolset

Abstract

Advanced Dynamics Inc. (ADI) has developed an integrated variable-fidelity toolset, “ASTE-P”, for modeling and simulation of aeroservothermoelasticity-propulsion (ASTE-P) effects of aerospace vehicles ranging from subsonic to hypersonic flights, which enables the accurate integration and tight/loose coupling of the fluid, structural and control field simulation with variable fidelity options available. The AE and ASE modules of ASTE-P toolset have comprehensive capability for modeling and simulation of multi-fidelity Aeroelastic (AE) / Aeroservoeastic (ASE) Dynamics of aerospace vehicles. The multi-fidelity AE/ASE dynamic modeling and simulation environments in ASTE-P toolset include: (1) the high-fidelity and full-order AE/ASE dynamics modeling and simulation environment, (2) fast AE/ASE dynamics modeling and simulation environment that is based upon reduced order models (i.e., POD/ROM, Volterra-ROM, etc.). Recently, the AE and ASE modules of ASTE-P have been succesfully integrated with Matlab/Simulink to enable various AE/ASE dynamic analyses and control system designs, including prediction of flutter/LCO and its suppression. In several of our previous papers, we have reported the rapid modeling and simulation environment in ASTE-P, including ROM models of POD, Volterra series, HDHB, and MSM-MPM aproaches, etc. In this paper, we will present the detailed theory and numerical procedure for coupling LES approach with structural dynamics model for AE modeling of an aerospace vehicle and its components/subcomponents. The improvement of the accuracy for LES over Euler/RANS is clearly demonstrated in present study by using benchmark AGARD 445.6 wing and Mavric wing test cases. I. Introduction eroelastic(AE)/Aeroservoelastic(ASE) dynamics of an aircraft involves aerodynamics and structure dynamics, therefore is a comprehensive and multidisciplinary research area. The analysis and evaluation of the aeroelastic /aeroservoelastic dynamics for aircraft is very important for performance, control and stability analysis of aircraft. Many of the methods that have been developed over the years for simpler AE/ASE models that use, for example, doublet lattice aerodynamics can be adopted for this purpose. However, these models are based on potential flow theory and cannot capture the nonlinear system dynamics in transonic flight regime. High-fidelity model do exist, but if high-fidelity computational fluid dynamics (CFD) and computational structure dynamics (CSD) approaches are used, the large degree-of-freedom, nonlinear fluid and structural system may take days to weeks to finish the computation and, thus are cost prohibitive. Advanced Dynamics Inc. (ADI) has developed an integrated multi-fidelity toolset, “ASTE-P” [1-3], for modeling and simulation of AE/ASE dynamics of aerospace vehicles ranging from subsonic to hypersonic flights, which enables the accurate integration and tight/loose coupling of the fluid, structural and control