Direct Numerical Simulation of Turbulent Rayleigh-Bénard Convection
Rayleigh-Bénard convection is a classical model to describe the complex convective flows occurring in the outer layer of stars, in aircraft cabins, in the Earth‘s core and mantle, as well as in its atmosphere and oceans, or even during cooking. In this model, a liquid or gas is studied, which is confined by a hot bottom plate and a cold top plate. Rayleigh-Bénard convection has been a field of active research for over a century, since, despite its apparent simplicity, it is still far from being completely understood. The scientists Olga Shishkina and Susanne Horn, working at the German Aerospace Center (DLR) in Göttingen, investigate the influence of temperature-dependent fluid properties (so-called non-Oberbeck-Boussinesq effects) and rotation. Using the vast computing power and simulation technologies available at GCS, direct numerical simulations for various fluids and a wide range of rotation rates were performed. This study helps to get closer to the understanding of realistic flows in nature and in engineering.
Institute of Aerodynamics and Flow Technology (AS), Department Fluid Systems (FLY), German Aerospace Center (DLR)
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