乱流混合層の直接数値計算によるSGSモデルの評価

概要

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Assessment of subgrid-scale models in large eddy simulation was conducted by using direct numerical simulation data of a temporally developing turbulent mixing layer. The direct numerical simulation data which were used for comparison of subgrid-scale models were carefully calculated by means of a spectral method. In this paper, various models for SGS stresses were tested and we obtained the following conclusions. (1) In the turbulent mixing layer, the Smagorinsky model, the Bardina model and the GNS model predict the mean value of Raynolds stress terms very well, whereas the local structures of the Reynolds stress cannot be well represented by the models. Among the three models, the Bardina model predicts the local structure best. (2) As for the cross terms, the Bardina model shows high correlation with DNS data. (3) The dynamic eddy viscosity model for total SGS stress is capable of predicting very small stress which is close to the Reynolds stress term.
一般社団法人日本機械学会の論文
1994-11-25