LESによる二重円管内乱流の解析 : 第1報,メッシュ数の影響

概要

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Turbulent flow is often encountered in various engineering fields such as mechanical and nuclear engineerings. Recent computer development has enabled the numerical simulation of turbulence such as direct numerical simulation (DNS) and large eddy simulation (LES). The LES is a numerical technique in which the large-scale turbulent structures are computed explicitly by the Navier-Stokes equation, and small structures are modeled by a so-called sub-grid model. In this study, fully developed turbulent channel and annulus flows are analyzed numerically using LES. In the case of channel flow, the present numerical results are found to agree well with those of the direct numerical simulation by J. Kim et al. For annular flow, comparison with the experimental data by Rehme showed that the asymmetric velocity field is well reproduced by the present calculation but some systematic discrepancy still remains. This is probably due to a relatively large mesh on the outer surface inevitable in the cylindrical coordinate.
一般社団法人日本機械学会の論文
1993-01-25