Stephan Stellmach is a researcher in geophysics and fluid dynamics. His University of Münster profile records work on density stratification, convective turbulence and magnetic field generation, alongside publications on rotating convection.[ref]
Research profile of Stephan Stellmach by University of Münster. Projects Effects of Density Stratification on Convective Turbulence and Dynamo Action, and publication list
His 2013 work with collaborators on fingering convection connects small-scale fluid dynamics to chemical transport inside stars. A stabilizing temperature gradient and an opposing composition gradient can have a stable combined mass density profile while still permitting fingers, because thermal diffusion and molecular diffusion act at different rates. Their paper develops a transport model supported by three-dimensional direct numerical simulations, with a prescription usable in one-dimensional models of stellar evolution.[ref]
Chemical Transport and Spontaneous Layer Formation in Fingering Convection in Astrophysics by Justin M. Brown and others. Abstract, three-dimensional direct numerical simulations and use in one-dimensional stellar codes; §1, differential-diffusion mechanism
The bridge between dimensions is the practical point: a one-dimensional calculation of a star's evolution cannot explicitly resolve every three-dimensional finger. Estimating their average transport from local numerical simulations supplies a model for that unresolved motion. It is a physically tested approximation within the modeled parameter regime, not a direct observation of all mixing inside a star.
Stephan Stellmach; portrait credited to Stephan Stellmach on the LMU DeepDyn team page
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