RANS AND LES COMPUTATIONS OF NATURAL CONVECTION IN A SQUARE CAVITY

Turbulent natural convection (Ra = 1.58 ⋅ 10⁹ ) in a confined 3D square cavity with two differentially heated side walls are simulated numerically using the in-house EDF code (Code_Saturne) based on the unstructured finite volume solver. The objective of the present work is to investigate the performance of the low-Reynolds-number models known by their good suitability for the near-wall treatment. The low-Reynolds-number models, shear stress transport (SST) k –w model, j− f model which is a developed version of the original ^–2 υ f model, and the LES (large-eddy simulation) technique are used, and the results of their using are compared with the experimental benchmark data. The numerical results show quantitative and qualitative agreements. In general, the SST k –w model gives good predictions for the temperature profiles, and the j− f model is more accurate for the velocity profile prediction. This is mainly due to the good resolution of the turbulence properties in the near-wall region and to the ability to mimic the physical flow features in this type of geometries.
  Автор:  M. Belharizi, A. Khorsi, Tayeb Yahiaoui, O. Ladjedel, L. Adjlout, F. Zemani, O. Sikula
Ключевые слова:  heat transfer, natural convection, differentially heated cavity, RANS, LES
Стр:  1017