Abstract
We present recent progress made in modelling stars and their turbulent magnetized dynamics in 3-D. This work is inspired by many years of discussion with Jean-Paul Zahn. I (ASB) first met him as a professor of astrophysical fluid dynamics (AFD) at the Paris-Meudon observatory's graduate school of astrophysics in 1994–1995. He made me the honor of accepting to be my PhD's advisor (1995–1998). He then supported me during my postdoc years in Boulder with his long time friend Prof. Juri Toomre between January 1999 and December 2002 and through the difficult process of getting a tenure position, and then since as a tenure researcher in Department of Astrophysics at CEA Paris-Saclay. I have been fortunate and lucky to share so many years discussing and doing scientific projects with Jean-Paul. As I was getting more experienced and started supervising my own students, he was always available, guiding us with his acute scientific vista and encouraging them. Antoine Strugarek, who co-author this paper, was like me fortunate to share Jean-Paul's knowledge. The three of us published several papers together during Antoine's PhD (2009–2012) addressing the dynamics of the solar tachocline and its interplay with convection. We miss him greatly. In this paper, we discuss mainly two topics that benefited from Jean-Paul's deep understanding of AFD: a) the dynamics of the solar tachocline and angular momentum transport in stellar interior and b) turbulent convection and dynamo action in stellar convection zones.
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