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| A
way to know whether a velocity field is |
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| smooth
or rough, is to inspect the energy |
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| spectrum
E(k) |
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| If b < 3 then the field
is rough |
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| If b > 3 then the field
is smooth |
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| This is equivalent to
examining the velocity structure function, |
| For which the boundary
between rough and smooth is a=1 |