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JOURNAL OF AIRCRAFT Vol. 41, No. 5, SeptemberOctober 2004

Vol. 41, No. 5, September­October 2004
Multi-Element High-Lift Configuration Design Optimization
Using Viscous Continuous Adjoint Method
Sangho Kim,
Juan J. Alonso,
and Antony Jameson
Stanford University, Stanford, California 94305
An adjoint-based Navier­Stokes design and optimization method for two-dimensional multi-element high-lift
configurations is derived and presented. The compressible Reynolds-averaged Navier­Stokes equations are used
as a flow model together with the Spalart­Allmaras turbulence model to account for high Reynolds number effects.
When a viscous continuous adjoint formulation is used, the necessary aerodynamic gradient information is obtained
with large computational savings over traditional finite difference methods. The high-lift configuration parallel
design method uses a point-to-point matched multiblock grid system and the message passing interface standard
for communication in both the flow and adjoint calculations. Airfoil shape, element positioning, and angle of attack
are used as design variables. The prediction of high-lift flows around a baseline three-element airfoil configuration,
denoted as 30P30N, is validated by comparison with available experimental data. Finally, several design results
that verify the potential of the method for high-lift system design and optimization are presented. The design
examples include a multi-element inverse design problem and the following optimization problems: lift coefficient
maximization, lift-to-drag ratio maximization, and the maximum lift coefficient maximization problem for both


Source: Alonso, Juan J. - Department of Aeronautics and Astronautics, Stanford University
Stanford University - Aerospace Computing Laboratory


Collections: Engineering