Abstract: Coolant is filled in gap between upper flywheel and components around. When the upper flywheel rotates at rated speed, turbulent Taylor vortices can be observed in the gap fluid. In order to predict and estimate the influence of turbulent Taylor vortices on heat transfer effect of the coolant, different turbulent models were chosen to simulate this phenomenon. The result of Reynolds stress model is proved to be the best one after comparing with an existing experiment. It is shown that several pairs of Taylor vortice distribute periodically along the side of flywheel and only one vortex is found near the top and bottom of flywheel. Heat flux and Nusselt number on the side of flywheel show a periodical variation characteristic which is determined by the distribution of turbulent Taylor vortices near the wall. Therefore heat transfer effect is greatly enhanced by turbulent Taylor vortices, which will exert great effect on the temperature distribution of flywheel and components around.