要約

Numerical and experimental investigations have been carried out to study the transition to turbulence of natural convective flows in a vertical conduit heated from one side. It is shown that the typical dynamics of large-scale structures of the flow and thermal fields of natural convection in open vertical channels are successfully modelled numerically by the use of the large-eddy algorithm. Furthermore, the fluctuations in both the velocity and temperature fields are also captured, providing valuable insights into the instantaneous flow dynamics occurring within the channel. A comparison between numerical and experimental results indicates that external disturbances play a significant role in the evolution of the dynamic behaviour of natural convective flows within the channel. Additionally, it is also demonstrated that a proper characterisation of the disturbance level in the ambient is necessary to bring the numerical and experimental results into close agreement.