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Nonexistence of simple hyperbolic blow-up for the quasi-geostrophic equation (Q1281446)

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Nonexistence of simple hyperbolic blow-up for the quasi-geostrophic equation
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    Nonexistence of simple hyperbolic blow-up for the quasi-geostrophic equation (English)
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    22 March 1999
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    The author considers a two-dimensional active scalar model for the 3D Euler vorticity equation. One defines a naturally associated notion of simple hyperbolic saddle breakdown and it is shown that such a breakdown cannot occur in finite time.
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    Euler vorticity equation
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    quasi-geostrophic equation
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    singularity
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    stream function
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