Numerical simulation of Intermittency occurrence during turbulence Collapse
Keywords:
CFD, Estraticação, Intermitência, LES, TurbulênciaAbstract
This study presents the use of Large Eddy Simulations (LES) in the analysis of laminarization in a turbulent planar Couette flow, induced by the application of a constant cooling rate at the surface. The increase in stratification leads to a reduction in turbulence intensity until the flow becomes laminar. During this process, a regime transition is observed in the flow, from a weakly stable layer to a highly stable layer, where intermittency is detected. The consistency of the results is investigated through the assessment of the turbulent kinetic energy of the flow. The results indicate that the mesh used is adequate, capturing approximately 80% of the turbulent kinetic energy, demonstrating the effectiveness of the LES model in representing turbulence collapse. However, the results also show that further refinements are needed near the surfaces. Moreover, the flow regime transition occurs after the absolute peak of heat flux energy at the surface. Following the transition, intermittency is observed until the suppression of all turbulent flow scales, leading to the laminarization of the flow.
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