対向直円管を有する矩形管路内の乱流構造解析

概要

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A numerical analysis has been performed on developing turbulent flow in simulated rod bundles. The ratio of pitch represented by two rod centers to rod diameter is 1.2 and Reynolds number is 20.0×10^4. The shape of the simulated rod bundle is that two of half-rods set in a rectangular-section duct. In calculation, an algebraic stress model was adopted in order to predict Reynolds stresses precisely, and the boundary-fitted coordinate system was introduced to set boundary conditions easily. Calculated results were compared with the experimental data available. The calculated profiles of secondary flow and Reynolds stresses in rod bundles are shown in this study. As a result of this calculation, it was found that the present method can predict the distributions of primary mean velocity and turbulent energy well. Moreover, the distributions of wall shear stress along the each wall and secondary flow are obtained without great discrepancy. In calculation, secondary flow is observed not only near corner regions but also near the central region of the duct. The calculated intensity of secondary flow appeared near the central region is small compared to that of corner regions. Although there are a few points of discrepancy with the experimental data, the present method is applicable to turbulent flow having a complex cross-sectional shape.
一般社団法人日本機械学会の論文
1995-06-25