BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Talks.cam//talks.cam.ac.uk// X-WR-CALNAME:Talks.cam BEGIN:VEVENT SUMMARY:Turbulent convection\, penetration and waves in stellar interiors: the challenges of multi-dimensional hydrodynamical simulations - Isabelle Baraffe (University of Exeter) DTSTART:20220519T101500Z DTEND:20220519T111500Z UID:TALK173576@talks.cam.ac.uk DESCRIPTION:\nI will discuss the process of convective penetration driven by turbulent convection \;\nin stars. The complex dynamics resulting f rom turbulent convection penetration in stable layers is a major process i n various geophysical and astrophysical environments.\nThis process is par ticularly important in stellar interiors because convective penetration dr ives the transport of chemical species and heat\, strongly affecting the s tructure and the evolution of stars. It also generates internal waves whic h can be detected at the stellar surface. The treatment of this process is one of the oldest unsolved problems of stellar structure and evolution th eory.\nI will present a study of convective penetration based on \;mul ti-dimensional stellar structure models performed with a new fully compres sible \;hydrodynamics time implicit code\, the MUSIC code. I will disc uss recent simulations devoted to the study of convection in the Sun and s olar-like stars. Our results suggest that penetrative convective flows at the boundary \;of a convective envelope modify the thermal background in the overshooting layer and produce a local heating. This heating can re duce the sound-speed discrepancy usually reported between \;solar mode ls and the Sun's structure inferred from helioseismology. I will also disc uss \;preliminary results for convective cores in a broad range of mas sive stars and current difficulties for numerical simulations to predict t he amount of convective boundary mixing required to reproduce observations .\n\n \;\n \; LOCATION:Seminar Room 1\, Newton Institute END:VEVENT END:VCALENDAR