Regensburg 2019 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 18: Fluid physics and turbulence

DY 18.9: Talk

Tuesday, April 2, 2019, 12:30–12:45, H20

Turbulence in precessing flows — •Andreas Tilgner and Oliver Goepfert — Institut für Geophysik, Universität Göttingen

There are several geophysical and astrophysical applications for which precession driven flows are of relevance. For example, the rotation axis of the Earth is precessing and this induces a flow in the liquid iron core of the Earth which may be at the origin of the Earth's magnetic field. The problem of tidal flows is closely connected to precession driven flows. In both cases, we are faced with a rotating fluid exposed to a time periodic forcing. The talk will describe the known routes to instability and turbulence, among which figure triad resonances which excite inertial waves. Precession driven flows may thus be a good model system to study wave turbulence of inertial waves. During the search for a wave turbulent state, a different and much simpler state emerged, consisting mainly of a single vortex.