Abstract: For the current situation that RANS method has always played a dominant role in numerical simulation of hydrodynamic torque converter, but it has low prediction accuracy and lacks accurate description of flow field structures, the SRS(scale-resolving simulation) method is employed to simulate the performance and internal flow field. The results show that SRS method can accurately capture the flow information and efficiently predict the original characteristics with high accuracy in the typical working conditions. Especially, the DHRL(dynamic Hybrid RANS-LES) model of SBES(stress-blended eddy simulation) method has shown the best prediction with the maximum error 3.24%. In addition, a method based on SRS model for calculating the thermal flow field with variable viscosity of transmission oil is also considered. It can be found that the performance prediction accuracy is obviously improved and the maximum error is less than 3% when the variable viscosity with temperature is considered. Applications of SRS analysis in the performance prediction of torque converter contributes to achieve low cost and short cycle design of the products.

Key words: hydrodynamic torque converter, internal flow field, performance prediction, scale-resolving simulation