**Subject:** Fluid mechanics.

**Explanation:** A circumference of unit radius centred on (2,0) is
advected by a deterministic flow field given by a clockwise vortex of
unit strength plus a sinusoidal flow pattern
*x*_{t}=sin(4*y*),
*y*_{t}=1/2 sin(4*x*), until *t*=10. The number
of points on the curve is adaptative.

**Bibliography:** See these slides
of a talk by S.N. Santalla and J. Rodríguez-Laguna in the UAM in 2003
for a short explanation.

**Software:** Program written by S.N. Santalla and
J. Rodríguez-Laguna, you may ask the web-admin for a copy.

**Printable copy:** See here.

All images are rendered using free software, and released under the GPL

*Last Update: 29 Dec 2005*

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