応力方程式モデルを用いた室内気流解析

概要

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The k-ε turbulence model is based on the concept of eddy viscosity model. This model is not so efficient in flow fields where the Reynolds stresses (-<u_iu_i>^^-) are significantly anisotropic, such as the fields near air inlets or near outlets, and the flow impinging against wall. On the other hand, a model which does not use the concept of eddy viscosity, as the differential second-moment model (hereafter abbreviated as DSM), does not suffer many problems that are originated by the eddy viscosity model. In the present study, we analyzed two-dimensional isothermal flow fields under steady state condition by utilizing DSM applied by Murakami et al. Through the comparison of these results with those obtained from the k-ε model, we then evaluated the validity of the model. In this report, two-dimensional flow field in Plenum chamber indicated by Huang et al, in which the anisotropy of flow fields is significant, were predicted. DSM captured the effect of the streamline curvature better than the k-ε model did. Furthermore, DSM evaluated the production term (P_k) of k more accurately than the k-ε model did. Therefore, the results of the distribution of flow fields, Reynolds stresses in DSM are physically more reasonable than those in the k-ε model. These results suggest that DSM is effective in analyses of flow fields where the anisotropy of the stresses is significant and eddy viscosity model can hardly be used.
明治大学の論文