CFD Based Determination of Aerodynamic Effects on Birds with Extremely Large Dihedral
Sachs G.a, Moelyadi M.A.b
a Institute of Flight Mechanics and Flight Control, Technische Universität München, Germany
b Aeronautics and Astronautics Department, Bandung Institute of Technology, Indonesia
Abstract
Using a sophisticated aerodynamic method, the effects of extremely large dihedral on the aerodynamic characteristics of birds are determined. With this method, it is possible to generate solutions for the addressed aerodynamic problem, which shows a high complexity due to interference effects caused by dihedral and pronounced 3-dimensional flow properties as well as due to complex wing geometries. From the obtained results it follows that extremely large dihedral has substantial effects on the aerodynamic force characteristics. There are significant changes in the lift, the drag and the side force, thus affecting the flight performance. Furthermore, the obtained results show that the aerodynamic rolling and yawing moment characteristics are influenced by extremely large dihedral to a high degree. This is a significant outcome for lateral-directional stability because the aerodynamic rolling and yawing moment characteristics have a determinative influence here. © 2010 Jilin University.
Author keywords
3-dimensional flow,Aerodynamic characteristics,Aerodynamic effect,Aerodynamic forces,Aerodynamic methods,Directional stability,Flight performance,Interference effects,Side force,Wing geometry,Yawing moment
Indexed keywords
aerodynamics,bird,CFD,dihedral