Investigation of free-s urface turbulent heat and mass transfer by means of large-scale direct numerical simulation and high-precision turbule nt measurement

在这项研究中，我们使用多界面平流与重构求解器(MARS)成功地对弗劳德数为1.8、雷诺数为2325的高Fr明渠湍流流动进行了直接的数值模拟，其基础是体积速度、重力加速度、水深和动能粘性。在自由面附近，壁面法线湍流强度和能量耗散率向自由面方向增大，自由面附近湍流统计量的变化趋势与激光多普勒风速仪(LDA)的实验测量结果基本一致。最后，我们建立了高精度的直接数值模拟器，可以覆盖高Pr换热和磁力设计活动对下一代聚变堆工程的影响。

In this study, we successfully conducted a direct numerical simulation of a high-Fr turbulent open-channel flow at a Froude number of 1. 8 and a Reynolds number of 2325 based on bulk velocity, gravitational acceleration, water depth, and kinetic viscosity, using the multi-interface advection and reconstruction solver(MARS). Near the free-surface, wall-normal turbulent intensity and energy-dissipation rates increase toward the free-surface, and the tendencies of turbulent statistical quantities near the free-surface are in good agreement with the experimental measurements obtained using a laser Doppler anemometer(LDA). Finally, we established the high-precision direct numerical simulator, which can be covered the effects of high-Pr heat transfer and magnetic force for design activity to the next generation fusion reactor engineering.