Surrogate Models for Transonic Aerodynamics for Multidisciplinary Design Optimization

Multidisciplinary design optimization (MDO) requires many designs to be evaluated while searching for an optimum. As a result, the calculations done to evaluate the designs must be quick and simple to have a reasonable turn-around time. This makes aerodynamic calculations in the transonic regime difficult. Running computational fluid dynamics (CFD) calculations within the MDO code would be too computationally expensive. Instead, CFD is used outside the MDO to find two-dimensional aerodynamic properties of a chosen airfoil shape, BACJ, at a number of points over a range of thickness-to-chord ratios, free-stream Mach numbers, and lift coefficients. These points are used to generate surrogate models which can be used for the two-dimensional aerodynamic calculations required by the MDO computational design environment. Strip theory is used to relate these two-dimensional results to the three-dimensional wing. Models are developed for the center of pressure location, the lift curve slope, the wave drag, and the maximum allowable lift coefficient before buffet. These models have good agreement with the original CFD results for the airfoil. The models are integrated into the aerodynamic and aeroelastic sections of the MDO code.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Aerospace Engineering

Department dc:contributor.department

Aerospace and Ocean Engineering

Grantor dc:publisher

Virginia Tech

Year dc:date.issued

2016

Author dc:creator

• Segee, Molly Catherine

Chairs dc:contributor.committeechair

• Schetz, Joseph A.
• Kapania, Rakesh K.

Committee member dc:contributor.committeemember

• Raj, Pradeep

• Transonic Aerodynamics
• Multidisciplinary Design Optimization
• Truss-braced Wings
• Strut-braced Wings
• Computational fluid dynamics
• Response Surface
• Surrogate Models
• Artificial Neural Networks
• Buffet Boundary

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Dc Identifier Other

vt_gsexam:7724

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/71321