BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Talks.cam//talks.cam.ac.uk// X-WR-CALNAME:Talks.cam BEGIN:VEVENT SUMMARY:Order at the mesoscale: Turbulent convection in horizontally exten ded domains - Joerg Schumacher (Technische Universität Ilmenau) DTSTART:20220307T111500Z DTEND:20220307T121500Z UID:TALK170660@talks.cam.ac.uk DESCRIPTION:Many natural flows at high Reynolds or Rayleigh numbers appear in the form of regular patterns at an intermediate range of scales\, the mesoscale range. Prominent examples comprise granulation or supergranulati on at the surface of the Sun and cloud streets in the atmosphere. In my ta lk I will present our recent investigation results on the origin of these mesoscale patterns\, their dependence on boundary conditions and additiona l physical processes\, such as rotation. I will also discuss the mixing an d transport properties in these flows. Our studies are based on 3d high-re solution direct numerical simulations of extended Rayleigh-Bé\;nard convection layers\, a paradigm of many natural convection flows. Our simul ation studies have been taken recently to very low Prandtl numbers of 0.00 1 which cannot be obtained in controlled laboratory experiments anymore. T he data show here that the fluid turbulence in the bulk of the convection layer is very close to classical Kolmogorov turbulence. LOCATION:Seminar Room 1\, Newton Institute END:VEVENT END:VCALENDAR