Abstract
The modeling technique of hydrodynamic torque converter flow passage was investigated. The semi-automatic modeling technique of torque converter flow passage was proposed. The flow passage model of each converter wheel is considered as a revolution entity sliced by two curved surfaces. In order to generate the revolution entity, a new approximation method, condition optimum arc approximation, was proposed. The method was used to approximate the meridional streamlines of the inner and outer wall. As a result, the three-dimensional revolution entity can be conveniently generated. In order to create slice surfaces, the central stream surface of flow passage was approximated with a quadric surface. The normal vector of the quadric surface and the thickness/thickness-function of bade were used to calculate the discrete point coordinates of blade surfaces. Via the rotation transformation to the coordinates, the discrete point coordinates of slice surfaces were obtained. A parameterized program code used for the hydrodynamic torque converter design and semi-automatic modeling was developed. Modeling errors were calculated and analyzed. The flow passage model was generated in several minutes with the help of the program code, Auto CAD and Solidworks software. Finally, the model was inputted into Gambit, and the pre-processing task used for the numerical simulation of torque converter flow field was successfully completed. The investigation results show that the semi-automatic modeling not only can ensure the accuracy of modeling, but also librates the research and design workers of torque converter from the time-consuming modeling work, which paves the way for the numerical simulation of the complex flow field of the hydrodynamic torque converter.
Highlights
Semi-automatic modeling refers to programming and, with the help of a computer, to directly generating the model for numerical simulation
A parameterized program code used for the hydrodynamic torque converter design and semi-automatic modeling was developed
The model was inputted into Gambit, and the pre-processing task used for the numerical simulation of torque converter flow field was successfully completed
Summary
Semi-automatic modeling refers to programming and, with the help of a computer, to directly generating the model for numerical simulation. The flow passage model of a converter wheel is a hexahedron which includes 6 curved surfaces. For such a complex shape, modeling is a challenging task. The existing modeling methods are uneasy to ensure the accuracy of the model (Won Sik Lim et al [11]). Fluent is the most widely used CFD software, and its pre-processing software Gambit can be used to create a two-dimensional or three-dimensional model For such a complex model of converter wheel passage, it is not very effective for Gambit to be used for modeling. The flow passage model of torque converter can be considered as a revolution entity sliced by two curved surfaces
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