FoilSim III was released on July 27, 2010. The newest version of the
FoilSim program calculates both the lift and drag of the Joukowsky family of airfoils, elliptical foils,
flat surfaces, rotating cylinders and balls. The web page that you are now visiting houses the
older FoilSim II program that ony calculates the lift.
This is a special, undergraduate, on-line version of the
If you are an experienced FoilSimU user, you can use the sleek
which does not contain the following instructions and loads faster on
FoilSimU includes all of the options of the original
version plus some additional input and output panels.
These panels are made available so that you can study the details of the
used in the Kutta-Joukowski analysis.
In the analysis, flow around a cylinder is mapped into
flow around an airfoil. Using the Input choice box
on the control panel,
you can display a generating plane input panel.
The panel contains four input variables which
control the size and location of the generating cylinder
relative to the poles of the transformation, and the
strength of the
which is embedded in the airfoil.
According to the
Kutta condition of the analysis,
the strength of the vortex is
set to bring the aft stagnation point to the trailing edge.
With this version of FoilSim, you can turn the Kutta condition
off by using the analysis choice box on the control panel to
study the effect.
A graph of the flow in the generating cylinder plane is
also available using the
Plot Selection option of the
Output choice box on the control panel.
A technical paper
describing the details of this method is also
You can download your own copy of the undergraduate program
by clicking on this yellow button:
There is an even more powerful version of FoilSimU which is available for
very experienced users. This program is a Java application, not an applet.
It runs stand alone and you must have Java installed on your computer to
run this program. The chief advantage of this program is that it can
write output files to your computer. You can obtain a copy of this program by
pushing the yellow button shown above.