Citation:
David W F Standingford & Shaun A Forth; A Discrete Sensitivity Solver for an
Industrial CFD Code via Automatic Differentiation. Computational Fluid Dynamics
2002, Proceedings of The Second International Conference on Computational Fluid
Dynamics, ICCFD, Sydney, Australia, 15-19 July, 2002, pp82-87
Abstract:
We report on development and validation of a discrete sensitivity solver for the
BAE SYSTEMS/Airbus UK CFD code FLITE-3D. We used the Odyssee automatic
differentiation (AD) tool to create a discrete forward sensitivity version of
FLITE-3D. Validation is via comparing sensitivities of integrated forces (lift,
drag, side force) with respect to (w.r.t) angle-of-attack (AoA) , calculated
using the sensitivity solver and central-differencing. Validation, w.r.t.
changes in the surface and field mesh, is performed by setting sensitivities of
all mesh related quantities as if rotated by an infinitesimal angle D alpha.
Such sensitivities correspond to those calculated w.r.t AoA alpha. We
investigate calculating discrete sensitivities under 2 approximations regarding
so-called mesh sensitivities, concluding that they are not applicable to FLITE-
3D. We present results of a wing geometry optimisation using forward
sensitivities.
