尺度解析湍流模拟方法在液力传动流动数值模拟中的应用

尺度解析模拟(Scale-Resolving Simulation,SRS)是指在一定尺度范围内对流动控制方程进行解析求解,理论上比全模化的雷诺应力平均(RANS)方法更先进。采用大涡模拟(Large Eddy Simulation,LES)中各种亚格子模型(Sub-grid Scale,SGS)和混合模型 Hybrid RANS/LES对液力元件包括:液力偶合器、液力变矩器和液力缓速器的内部流动进行了瞬态模拟。对比模拟结果与试验数据发现,SRS方法能够提高对液力元件外特性的预测精度,通过对复杂的瞬态流动现象的清晰捕捉,深入展示了描述流动机理的能力。SRS模拟表现出了工业应用的潜力。

Application of Scale-resolving Simulation in Hydrodynamic Transmission

Scale-Resolving Simulation (SRS) has the ability of partially resolving the flow field, which is more theoretically advanced than RANS. However, RANS method has always played a dominant role in simulation of hydrodynamic transmission so far. In this paper, s series of SRS simulations, employing LES with various SGS models and Hybrid RANS/LES method, were carried out in the transient flow simulation of hydraulic coupling, torque converter and hydraulic retarder. Compared with the experimental data, it was found that the accuracy of performance prediction was improved, and a closer understanding of flow mechanism was obtained by clearly capturing the complex instantaneous flow phenomena, which was significant for industrial application. The SRS simulation showed the potential in industrial application.