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The present study investigates the impact of various surface boundary conditions on turbulent Rayleigh–Bénard convection within a cubic cavity configuration. Simulations are conducted with a characteristic-based off-lattice Boltzmann method (LBM) solver at a Rayleigh number of \(Ra=2\times 10^6\) and a Prandtl number of \(Pr=4.38\) (water) using a direct numerical simulation (DNS) approach. The current study considers different boundary conditions such as no-slip, free-slip, and Navier-slip conditions on the walls with variations in slip length and wall-slip anisotropy. Results are evaluated through mean isotherms, streamlines, root-mean-square fluctuations, and Nusselt number. The results obtained demonstrate that the selection of wall-boundary conditions has a significant influence on the flow organization within the cavity and on the heat transfer across it.

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Investigating Slip-Velocity Boundary Conditions in Turbulent Thermal Convection Using a Lattice Boltzmann Method

  • 会议论文

  • 发表日期：

    2026年

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  • Sai Ravi Gupta Polasanapalli,
  • Marten Klein,
  • Heiko Schmidt

摘要

The present study investigates the impact of various surface boundary conditions on turbulent Rayleigh–Bénard convection within a cubic cavity configuration. Simulations are conducted with a characteristic-based off-lattice Boltzmann method (LBM) solver at a Rayleigh number of \(Ra=2\times 10^6\) and a Prandtl number of \(Pr=4.38\) (water) using a direct numerical simulation (DNS) approach. The current study considers different boundary conditions such as no-slip, free-slip, and Navier-slip conditions on the walls with variations in slip length and wall-slip anisotropy. Results are evaluated through mean isotherms, streamlines, root-mean-square fluctuations, and Nusselt number. The results obtained demonstrate that the selection of wall-boundary conditions has a significant influence on the flow organization within the cavity and on the heat transfer across it.