Aerodynamic Shape Optimization Research

Abstract

Despite extensive study on aerodynamic form
optimization, no standard benchmark issue
exists to allow researchers will compare their
findings. This study responds to this topic by
addressing several optimizations of
aerodynamic form concerns based on the
wing benchmark of the common research
model scenario developed ADODG stands for
discussion group for aerodynamic design
optimization. The aerodynamic model
employs a Spalart-Allmaras model. To solve
the Reynolds-averaged Navier-Stokes
equations, a turbulence model is employed.
An adjoint approach for computing the
necessary derivatives is used in conjunction
with a gradient-based optimization strategy.
While taking the lift, pitching moment, and
geometric limitations into account, the drag
coefficient is minimized. To lower the
computing cost of the optimization, a
multilevel method is applied. A 28.8-millioncell mesh is used to solve a single-point
optimization with 720 form variables,
resulting in an 8.5% reduction in drag. A
multipoint optimization produces a more
realistic design. Even though the minimum
drag values are only 0.4% apart from one
another in terms of drag counts, while the
geometries vary by only 0.1 drag counts,
multiple local minima are discovered using a
large number of randomly generated
geometries. The impact of changing the
amount of form design factors is investigated.
The common geometry and meshes for both
the baseline and research model wing
benchmark problems were valuable for
validating our design optimization approach
and improved wings are included in this
research as extra materials.