Fully Coupled Reduced Order Models for Aero-Thermo-Elastic Analysis of Hypersonic Airframes: FullCoRe
Abstract
Supersonic and hypersonic airframes are subjected to extreme loading due to aerodynamic pressure, heat fluxes, and acoustic loading. These excitations result in very complex structural behavior, for which nonlinear modeling is a must when accurate strength and fatigue life prediction is of interest. Practice has shown that linearized models and/or modeling oversimplification of the above-mentioned load sources, together with the neglecting of their coupling, could lead to erroneous, non-conservative estimation of the structural response. Especially when fatigue life estimation is of concern, designers need to be able to run long time span simulations comprising representative maneuvers and flight paths. Current high-fidelity modeling techniques, however, generate large, discretized models that result in extremely long computational times, and are therefore of very limited use in a design context. In this scenario, resorting to reduced order models (ROMs) is unavoidable. Unfortunately, ROMs comprising all the necessary features of the phenomena at hand, namely geometric nonlinearity, aerodynamic pressure and heat, acoustic loads, and their coupling, are somewhat still in their infancy. FullCoRe aims at developing ROMs to tackle analysis and design for the aforementioned scenarios. It will do so by leveraging on past contributions and novel techniques. In particular, the ROMs will feature full coupling across thermal, aerodynamic, and structural field. The structural model will be effectively reduced by projection on subspaces featuring vibration modes and modal derivatives, so to include geometric nonlinear effects. The projection basis will adapt on-line with the thermal field to best represent, at every time, the thermally induced stresses of the structure. The time-scale dichotomy between the structural, thermal, and aerodynamic phenomena will be taken into advantage to setup efficient techniques for the ROM construction and numerical time integration. Namely, being the time scales associated to the aerodynamic pressure and the thermal field being orders of magnitude slower than those of the structural problem, static-like approaches could be set in place for the non-intrusive construction of the ROM.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 20, 2023
- Source ID
- FA86552217040
Entities
People
- Paolo Tiso
Organizations
- Air Force Office of Scientific Research
- ETH Zurich
- United States Air Force