The Proceedings of the Conference on Information, Intelligence and Precision Equipment : IIP
Online ISSN : 2424-3140
2022
Session ID : IIP2R1-A04
Conference information

An Attempt of Invariant-Based Analysis of the Structure of the Flow Driven by Corotating Disks Mounted in a Non-Axisymmetric Enclosure
*Katsuaki ShiraiMizuki SakamotoBeomzu Kim
Author information
CONFERENCE PROCEEDINGS RESTRICTED ACCESS

Details
Abstract

We focus on complex flow existing in hard disk drive used as information storage device. Fast revolution of thin disks drive the fluid inside an enclosure. The resulting rotating flow passes through complex geometry inside the drive and hence the flow exhibits unsteady three-dimensional behavior. In the past research, we have observed the behavior using flow visualization, and the velocity statistics have been obtained based on particle image velocimetry (PIV). However, some of the statistics are coordinate-dependent and their interpretation remains difficult. In the present study, we attempt topological understanding of the flow stuructures based on tensor invariants. We calculated two-dimensional invariant maps of flow velocities obtained by two-dimensional PIV measurements. In the topological analysis, we found out that there is a certain implication of the instable states on a quadrant region with disturbance by the insertion of an arm into the rotating flow.

Content from these authors
© 2022 The Japan Society of Mechanical Engineers
Previous article Next article
feedback
Top