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The Butterfly Effect

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Let Ek ( ) denote the kinetic energy per unit<br />

wave number of the system at wave number<br />

k<br />

−3/2 −1/2<br />

Eddy "turn over" time τ ( k) : k E ( k)<br />

<strong>The</strong> time taken for some initial small-scale error<br />

to grow and nonlinearly infect some large-scale<br />

component k , N powers of 2 larger in scale,<br />

N<br />

n<br />

( N) τ ( 2 k )<br />

Ω =∑<br />

n=<br />

0<br />

L<br />

L<br />

:<br />

:

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