Project Falcon Validation Project Falcon for Autodesk® Alias software is a wind tunnel simulator that allows you to interactively investigate the aerodynamic performance of your design at any stage using a robust meshing technique. The solver technology that drives Falcon utilizes the following CFD techniques to simulation the air flow over the body: • • • •
Transient, Incompressible fluid flow solver Finite Volume Method Full 2D and 3D Navier-Stokes fluid solution LES turbulence model
To highlight the accuracy of this solver technology, Falcon’s full 3D analysis was applied to a number of aerodynamic cases. As shown by the plot of the coefficient of drag, a measure of the aerodynamic drag of the object, in each of these cases Falcon was able to settle on a value that closely matched the published values.
Case
Flow (1m/s) pass a sphere (Ă˜150mm)
Observed
Drag Coefficient: 0.47 Source: http://en.wikipedia.org/wiki/Drag_coefficient
Falcon
Drag Coefficient: 0.48
Voxel size: 6mm; Analysis Grid: 150x83x83
Case
Flow (1m/s) pass a cube (150mm)
Observed
Drag Coefficient: 1.05 Source: http://en.wikipedia.org/wiki/Drag_coefficient
Falcon
Drag Coefficient: 0.99
Voxel size: 14mm; Analysis Grid: 128x85x85
Case
Flow (1m/s) pass an angled cube (150mm)
Observed
Drag Coefficient: 0.8 Source: http://en.wikipedia.org/wiki/Drag_coefficient
Falcon
Drag Coefficient: 0.76
Voxel size: 10mm; Analysis Grid: 150x100x100
Case
Flow (1m/s) pass a 60째 cone
Observed
Drag Coefficient: 0.50 Source: http://en.wikipedia.org/wiki/Drag_coefficient
Falcon
Drag Coefficient: 0.52
Voxel size: 10mm; Analysis Grid: 120x80x80
Case
Flow (23.5m/s) over an Ahmed body (25째 slant)
Observed
Drag Coefficient: 0.4 Source: H. G. Castro, R. R. Paz, M. A. Storti, V. E. Sonzogni, J. O. Marighetti and M. E. De Bortoli: Experimental and numerical study of the aerodynamic behavior of a simplified road vehicle
Falcon
Drag Coefficient: 0.43
Voxel size: 7mm; Analysis Grid: 499x270x157