scholarly journals Aerodynamic design optimization on unstructured grids with a continuous adjoint formulation

1997 ◽  
Author(s):  
W. Anderson ◽  
V. Venkatakrishnan ◽  
W. Anderson ◽  
V. Venkatakrishnan
Keyword(s):  
Design Optimization ◽  
Unstructured Grids ◽  
Aerodynamic Design ◽  
Aerodynamic Design Optimization ◽  
Adjoint Formulation ◽  
Continuous Adjoint

Aerodynamic design optimization of a hypersonic rocket sled deflector using the free-form deformation technique

2021 ◽  
pp. 095441002199498
Author(s):  
Tianjiao Dang ◽  
Bingfei Li ◽  
Dike Hu ◽  
Yachuan Sun ◽  
Zhen Liu
Keyword(s):  
Design Optimization ◽  
Optimization Method ◽  
Free Form ◽  
Aerodynamic Design ◽  
Aerodynamic Shape ◽  
Aerodynamic Design Optimization ◽  
Continuous Adjoint Method ◽  
Free Form Deformation ◽  
Shape Parameterization ◽  
Continuous Adjoint

An aerodynamic design optimization of a hypersonic rocket sled deflector is presented using the free-form deformation (FFD) technique. The objective is to optimize the aerodynamic shape of the hypersonic rocket sled deflector to increase its negative lift and enhance the motion stability of the rocket sled. The FFD technique is selected as the aerodynamic shape parameterization method, and the continuous adjoint method based on the gradient method is used to search the optimization in the geometric shape parameter space; the computational fluid dynamics method for a hypersonic rocket sled is employed. An automatic design optimization method for the deflector is carried out based on the aerodynamic requirements of the rocket sled. The optimization results show that the optimized deflector meets the design requirement of increasing the negative lift under the constraint of drag. By improving the pressure distribution on the surface of the deflector, the negative lift is increased by 7.39%, which confirms the effectiveness of the proposed method.

scholarly journals Numerical Investigation of an Optimized Rotor Head Fairing for the RACER Compound Helicopter in Cruise Flight

Aerospace ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 66
Author(s):  
Patrick Pölzlbauer ◽  
Andreas Kümmel ◽  
Damien Desvigne ◽  
Christian Breitsamter
Keyword(s):  
Drag Reduction ◽  
Design Optimization ◽  
Cost Effective ◽  
Aerodynamic Design ◽  
Ansys Fluent ◽  
Aerodynamic Design Optimization ◽  
Flow Phenomena ◽  
Compound Helicopter ◽  
Rotor Head ◽  
Cruise Flight

The present work is part of the Clean Sky 2 project Full-Fairing Rotor Head Aerodynamic Design Optimization (FURADO), which deals with the aerodynamic design optimization of a full-fairing rotor head for the Rapid And Cost-Effective Rotorcraft (RACER) compound helicopter. The rotor head is a major drag source and previous investigations have revealed that the application of rotor head fairings can be an effective drag reduction measure. As part of the full-fairing concept, a new blade-sleeve fairing was aerodynamically optimized for cruise flight. Within this publication, the newly developed blade-sleeve fairing is put to test on an isolated, five-bladed rotor head and compared to an already existing reference blade-sleeve fairing, which was developed at Airbus Helicopters. Numerical flow simulations are performed with ANSYS Fluent 2019 R2 considering a rotating rotor head with cyclic pitch movement. The aerodynamic forces of the isolated rotor head are analyzed to determine the performance benefit of the newly developed blade-sleeve fairing. A drag reduction of 4.7% and a lift increase of 20% are obtained in comparison to the Airbus Helicopters reference configuration. Furthermore, selected surface and flow field quantities are presented to give an overview on the occurring flow phenomena.

scholarly journals Double-stage Metamodel and Its Application in Aerodynamic Design Optimization

2011 ◽  
Vol 24 (5) ◽  
pp. 568-576 ◽  
Author(s):  
Dehu ZHANG ◽  
Zhenghong GAO ◽  
Likeng HUANG ◽  
Mingliang WANG
Keyword(s):  
Design Optimization ◽  
Aerodynamic Design ◽  
Aerodynamic Design Optimization

Practical considerations in aerodynamic design optimization

1995 ◽  
Author(s):  
W Jou ◽  
W Huffman ◽  
D Young ◽  
R Melvin ◽  
M Bieterman ◽  
...  
Keyword(s):  
Design Optimization ◽  
Aerodynamic Design ◽  
Aerodynamic Design Optimization
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