Streamlines Past Sources and Vortices

Drag any of the singularities from the well on the right into the main computation area.
Set the freestream speed (the flow is from left to right), then click Compute.
The marks on the page simulate small tufts and indicate the direction of the local flow. Experiment with multiple singularities to simulate a pair of wing trailing vortices, a source/sink doublet, or a spinning baseball.

If you do not see the results you may want to try an alternate version of this applet. Due to certain platform-dependent java problems, this program may not work with some browsers on some platforms. If not, try here for a less cool, but simpler version of the program.