Time：3:00pm Apr. 28th (Thursday)

Zoom ID：896 1966 7680，密码：6360

Speaker：Prof. Max Gronke（Max Plank Institute for Astrophysics）

Title：Multiphase, turbulent gas dynamics

Abstract: Astrophysical systems, such as the interstellar, intracluster, or the circumgalactic medium, are usually multiphase with a colder phase embedded in a volume filling hot environment. Although ubiquitous, multiphase gas is notoriously hard to model which leads to often unconverged cold gas properties in large scale (cosmological) simulations. In such (turbulent) systems, hydrodynamical instabilities can destroy the cold gas on a short timescale. However, this mixing also leads to intermediate temperature gas which can radiatively cool and (re)form cold gas. In this talk, I want to discuss under which conditions the cold gas can survive in a turbulent medium, and what sets the mass transfer between the phases. I will show that the survival criterion sets a characteristic scale of cold gas but the dynamics and growth will lead to a scale-free mass distribution. I will discuss implications for observations, and convergence criteria for large scale simulations.

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