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Proposing Institution

Max-Planck-Institut für Dynamik und Selbstorganisation
Project Manager

Prof. Dr. Detlef Lohse
P.O. Box 217
7500AE Enschede
Motivated by astrophysical, geophysical, and industrial applications, research in thermal convection aims at reaching high Rayleigh (Ra) numbers. The highest Ra number has been obtained using cryogenic helium or pressurized gasses. Although these experiments are performed in geometrically similar devices they show different results for Ra>5x10^{11}. The reason for this disagreement is not understood. It is conjectured that construction details of the cells or different fluid properties might play a role. Numerical simulation are a precious tool to disentangle these riddles. The highest Ra number obtained by simulations is Ra=2x10^{12}, which is just above the Ra number where differences become visible. The goal is to raise the limit in simulation to Ra=5x10^{13}; this will allow to shed light on the flow physics under ideal conditions and to analyze the flow dynamics in detail. The generated database will provide invaluable reference data that will be shared with the community.The goal of this project is to use DNS to study the transition towards ultimate RB regime. We aim to raise the Ra number accessed in DNS by more than an order of magnitude up to Ra = 5x10^{13}. This will require a simulation on a grid with 336x10^9 grid points and 90 Million CPU hours. This simulation will allow to shed some light on the flow physics under ideal conditions and to analyze the flow dynamics in every detail. The resulting database will be shared with the turbulence community.

Impressum, Conny Wendler