Estimating Aircraft Stability Derivatives Through Finite Element Analysis

Computation of Aircraft Stability Derivatives Using an Automatic Differentiation Adjoint Approach

“…The previous two approaches to dynamic derivative computation (those of Limache and Cliff [9] and Park et al [10,11] ) relied on a noninertial reference frame CFD formulation to handle the rotational rates needed for the dynamic derivatives. Babcock and Arena [15] handled the dynamic derivatives by modifying the boundary conditions in a finite-element-based Euler CFD solver to separate the velocity and position boundary conditions. With this approach, they were able to perturb the static states ; and the dynamic states p; q; r independently to determine the stability derivatives using finite differences.…”

Computing Stability Derivatives and Their Gradients for Aerodynamic Shape Optimization

“…Limache and Cliff [14] demonstrated the use of adjoint methods for the computation of dynamic stability derivatives for a two-dimensional case. Babcock and Arena [15] modified the boundary conditions in a finite-element-based Euler CFD solver to separate the velocity and position boundary conditions and to allow the computation of the dynamic derivatives using finitedifferencing. Mader and Martins [16] demonstrated the use of an AD adjoint solver for the computation of stability derivatives on a three-dimensional CFD solver.…”