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cgiet_01

Prof. Dr. Georg Weiss (Universität Düsseldorf): Singularities of axisymmetric flows with gravity.

Donnerstag, 03.05.2012 16:30
Mathematik und Informatik

We consider a steady axisymmetric solution of the Euler equations for a fluid (incompressible and with zero vorticity) with a free surface, acted on only by gravity. We analyze stagnation points as well as points on the axis of symmetry. At {\em stagnation points} on the axis of symmetry, the unique blow-up profile consistent with the invariant scaling of the equation is {\em Garabedian's pointed bubble solution} with water above air. Thus at stagnation points on the axis of symmetry with no water above the stagnation point, the invariant scaling of the equation cannot be the right scaling. A fine analysis of the blow-up velocity yields that in the case that the surface is described by an injective curve, the velocity scales almost like $\sqrt{X^2+Y^2+Z^2}$ and is asymptotically given by the velocity field $$V(\sqrt{X^2+Y^2},Z)=c (-\sqrt{X^2+Y^2}, 2Z)$$ with a nonzero constant $c$. The last result relies on a frequency formula in combination with a concentration compactness result for the axially symmetric Euler equations by J.-M. Delort. While the concentration compactness result alone does {\em not} lead to strong convergence in general, we prove the convergence to be strong in our application.



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Angelegt am Mittwoch, 28.03.2012 08:46 von cgiet_01
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