This work is devoted to a computational investigation of the cavitation and mixing characteristics of two miscible (Schmidt number Sc = 10³) turbulent water flows with different viscosity ratios in a Venturi tube. The 2D axis‐symmetric RANS and 3D LES turbulence models are used for the prediction of flow characteristics. The numerical results reveal that the RANS solutions underpredict the rate of vapour production and overestimate the mixing rate of two miscible fluids in comparison to LES simulations for the inlet Reynolds number of 19 738 (Case‐1) and 19 286 (Case‐2). In particular, there is a larger cavitation zone in the Venturi tube with LES in comparison to RANS calculations.

中文翻译：

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文丘里管内空化流混合的数值研究

这项工作致力于对文丘里管中两种具有不同粘度比的混溶（Schmidt数Sc = 10 ³）混浊水流的空化和混合特性进行计算研究。2D轴对称的RANS和3D LES湍流模型用于预测流动特性。数值结果表明，与LES模拟的19 738（Case-1）和19 286（Case-2）入口的雷诺数相比，RANS解决方案低估了蒸汽的产生速率，并高估了两种混溶流体的混合速率。尤其是，与RANS计算相比，带有LES的文丘里管中有较大的空化区。