Shuchi Yang, P.C. Chen, Zhicun Wang
DOI Number: N/A
Conference number: IFASD-2015-097
A linearized unsteady Euler solver, referred to as ZONA Unstructured Linearized Unsteady Solver (ZULUS), is developed to solve the linearized frequency-domain Euler equation on an unstructured mesh using the steady background flow solution generated by the FUN3D Navier-Stokes (N-S) solver developed NASA Langley. ZULUS can generate an accurate unsteady aerodynamic solution in the small perturbation sense about a nonlinear steady flow condition with a transpiration boundary condition that is applied on the stationary mesh. It also can avoid the moving mesh problem associated with applying the exact N-S boundary condition which requires additional computational resources, and becomes very complex in dealing with the discontinuous displacement in mode shapes such as the control surface modes for which generating a computational mesh could be a very tedious effort. Using the generalized aerodynamic forces due to structural modes, control surface kinematic modes and gust excitation generated by ZULUS, one can design a flutter suppression and gust load alleviation controller using the modern control design schemes and perform aeroservoelastic analysis for the open-loop and closed-loop aeroelastic systems.