High-resolution simulation boundary layer studies in Rayleigh-Bénard convection
ORAL
Abstract
We analyse the near-wall statistics of Rayleigh-Bénard convection through high resolution direct numerical simulations of convection in a box with periodic sides and a modestly large aspect ratio of 4. The Prandtl number is Pr = 0.7, while the Rayleigh number is 105 < Ra < 1010. We analyze the time-series and temporal statistics of volume averaged and wall Nusselt numbers, as well as mean kinetic energy. Additionally we present the velocity and temperature statistics in the viscous and thermal boundary layers. These new DNS data are also related to our previous high-Rayleigh number DNS in slender cells. We employ the latest GPU-accelerated spectral element solver, NekRS, which is derived from the widely used Nek5000 code, for our simulations. Weak and strong scaling performance of this new solver for simulations of thermal convection is also discussed in brief.
*The work of R.S. is funded by the European Union (ERC, MesoComp, 101052786). Views and opinions expressed are however those of the authors only and do not necessarily reflect those of the European Union or the European Research Council. Neither the European Union nor the granting authority can be held responsible for them. The work of J.D.S. was supported by a Mercator Fellowship of the Deutsche Forschungsgemeinschaft. The authors gratefully acknowledge the Gauss Centre for Supercomputing e.V. (https:// www.gauss-centre.eu) for funding this project by providing computing time through the John von Neumann Institute for Computing (NIC) on the GCS Supercomputer JUWELS Booster at Juelich Supercomputing Centre (JSC).
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Presenters
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Roshan Samuel
- TU Ilmenau
- Technical University Ilmenau