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DY: Fachverband Dynamik und Statistische Physik

DY 5: Fluid Physics: Turbulence and Convection

DY 5.4: Vortrag

Montag, 27. März 2023, 10:30–10:45, MOL 213

Delayed onset in spanwise rotating compressible convection — •Kevin Lüdemann and Andreas Tilgner — Institute for Astrophysics and Geophysics, Göttingen, Germany

We are investigating compressible convection with spanwise rotation in direct numerical simulations meaning that the direction of gravity and the axis of rotation are perpendicular to each other. This is a model for the equatorial region of gas planets like Jupiter or Earth's outer core. Both consist of compressible liquids ranging many orders of magnitude in density variations for Jupiter to about 20 percent of density changes for earth outer core. We are more interested in moderate density changes since those are realizable in laboratory experiment like the one performed in Lyon. From a parameter study in the number of density scale heights controlling the compressibility and the Ekman number controlling the global rate of rotation, we find that the onset of convection is delayed by compressibility and rotation. Additionally, a horizontal drift of the many slender convection rolls has been found at the onset for high rotation rates. An extensive study is presented highlighting these unforeseen results.