Seyyed Mohammad Mansoori - Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran
Mohammad Bagher Safari - Department of mechanical engineering, Sirjan University of technology, Sirjan, Iran
Mohammad Fereidoonnezhad - Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran

In this paper the performance of the rotating gear and gearbox has been studied numerically. In this research we find out the impact of pressure and velocity and thickness of outlet and inlet The results show thatthe best manners happened at 11320 mm diameter and thickness of 40mm and velocity of 9 rpm. Also in both manners it can bee shown that by increasing the space, the velocity magnitude is rising until the diameter of 11320 mm, after that by increasing the space, velocity is decreasing. Until the diameter of 11320 mm by increasing the space then the maximum of pressure will increase .after that the pressure will decrease

Gear, Gearbox, CFD simulation