Abstract
Turbulent flow in a HDD model which contained two disks and a RW (Read and Write) arm was numerically analyzed at a disk rotation Reynolds number of about 10^5 . The evaluation of the fluctuating torque revealed that the RW arm may be oscillated at a frequency which has only weak correlation with the disk rotation speed. The fluctuating pressure was stronger on the leeward surface of the RW than that of the windward. It was further indicated that the fluctuating torque on the RW arm is well correlated with the surface pressure fluctuation on the shroud wall.
