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.

NUMERICAL AND EXPERIMENTAL INVESTIGATION OF UNSTEADY NATURAL CONVECTION IN AN OPEN CHANNEL

FOSSA, MARCO;
2012-01-01

Abstract

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.
2012
9781567003031
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/426117
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