Reaction-diffusion equations are used to predict twisted spiral waves—the inner and outer parts are wound in opposite directions. The spiral retains its shape as it rotates.
Front Reversals, Wave Traps, and Twisted Spirals in Periodically Forced Oscillatory Media
Oliver Rudzick and Alexander S. Mikhailov
Phys. Rev. Lett. 96, 018302 (2006)
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