The Leibniz-Institute for Astrophysics Potsdam (AIP) invites applications for Doctoral student positions (m/f/d) in Computational Astrophysics for projects in Computational Galaxy Formation and Computational Fluid Dynamics. Funding for these positions is provided by a new initiative pursuing multidisciplinary collaborations between astrophysics and climate modelling. At the core of this newly funded Leibniz ScienceCampus SCALES are next-generation simulation techniques, hybrid modelling strategies, and the use of machine learning, particularly neural networks that learn physical laws with the goal to significantly improve the representation of subscale processes in astro- and climate-physics. One project aims at studying the multi-scale nature of the gaseous reservoir surrounding massive galaxies and links the central galaxy to its broader cosmological environment. The other project studies the emergence of coherent large-scale streams in a turbulent flow, with important application to protoplanetary discs and planets.