Instability behaviors of a cylinder array under both increasing and decreasing flow velocities

• Main Authors: Xu Zhang, Bin Jiang, Xiaoming Xiao
• Format: Article
• Language: English
• Published: JVE International 2017-03-01
• Series: Journal of Vibroengineering
• Subjects: crossflow-induced vibration; fluid-elastic instability; cylinder array; increasing and decreasing flow velocities
• Online Access: https://www.jvejournals.com/article/17200
• ISSN: 1392-8716; 2538-8460

This study aimed to investigate the effects of increasing and decreasing crossflow velocities on the fluid-elastic instability behaviors of cylinder arrays. The responses of an elastically mounted cylinder in a rigid normal square cylinder array in a water tunnel subjected to crossflow were tested. The responses were simultaneously obtained from both in-line and transverse vibrations. Results show that the responses under increasing freestream velocity differ from those under decreasing freestream velocity. Under decreasing freestream velocity, fluid-elastic instability was accompanied by nonlinear hysteresis, and the cylinder exhibiting this instability can remain in this state for a certain range of flow velocities. Added mass coefficients were also obtained. Two criteria for fluid-elastic instability were applied.