Table of Contents
Journal of Aerodynamics
Volume 2014, Article ID 931232, 11 pages
http://dx.doi.org/10.1155/2014/931232
Research Article

Shape Optimization of an Airfoil in Ground Effect for Application to WIG Craft

1Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, St. Louis, MO 63130, USA
2Institute of Fluid Mechanics, Beijing Institute of Aeronautics and Astronautics, Beijing 100191, China
3Washington University in St. Louis, St. Louis, MO 63130, USA

Received 31 May 2014; Accepted 19 October 2014; Published 8 December 2014

Academic Editor: Jian-han Liang

Copyright © 2014 Yilei He et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper employs a multiobjective genetic algorithm (MOGA) to optimize the shape of a widely used wing in ground (WIG) aircraft airfoil NACA 4412 to improve its lift and drag characteristics, in particular to achieve two objectives, that is, to increase its lift and its lift to drag ratio. The commercial software ANSYS FLUENT is employed to calculate the flow field on an adaptive structured mesh generated by ANSYS ICEM software using the Reynolds-Averaged Navier-Stokes (RANS) equations in conjunction with a one equation Spalart-Allmaras (SA) turbulence model. The results show significant improvement in both the lift coefficient and lift to drag ratio of the optimized airfoil compared to the original NACA 4412 airfoil. It is demonstrated that the performance of a wing in ground (WIG) aircraft can be improved by using the optimized airfoil.