in the end, the relationship between changes in a converter circuit's flow-patterns and the efficiency of a torque-converter can then be used to identify potential improvement areas. to a large extent, the predicted values match well with the actual operational measurements, although some differences do occur due to the use of time-saving simplified simulations. still, cfd allows the optimization of existing converters as well as the development of new virtual-converter types via computer. afterwards the building of a prototype and the verification of the actual performance results concludes the development phase.