Skip to main content
Journal cover image

Asymmetric instability of flow-induced vibration for elastically mounted cube at moderate Reynolds numbers

Publication ,  Journal Article
Cheng, Z; Zhang, JH; Wang, R; Lien, FS; Dowell, EH
Published in: Journal of Fluid Mechanics
October 1, 2024

The asymmetric instability in two streamwise orthogonal planes for three-dimensional flow-induced vibration (FIV) of an elastically mounted cube at a moderate Reynolds number of 300 is numerically investigated in this paper. The full-order computational fluid dynamics method, data-driven stability analysis via the eigensystem realization algorithm and the selective frequency damping method and total dynamic mode decomposition (TDMD) are applied here to explore this problem. Due to the unsteady non-axisymmetric wakefield formed for flow passing a stationary cube, the FIV response was found to exhibit separate structural stability and oscillations (including lock-in and galloping behaviour) in the two different streamwise orthogonal planes while the body is released. The initial kinetic energy accompanying the release of the cube could destabilize the above-mentioned structural stability. The observed FIV asymmetric instability is verified by the root trajectory of the structural mode obtained via data-driven stability analysis. The stability of the structural modes dominates regardless of whether the structural response oscillates significantly in various (reduced) velocity ranges. Further TDMD analysis on the wake structure, accompanied by the time-frequency spectrum of time-history structural displacements, suggested that the present FIV unit with galloping behaviour is dominated by the combination of the shifted base-flow mode, structure modes and several harmonics of the wake mode.

Duke Scholars

Altmetric Attention Stats
Dimensions Citation Stats

Published In

Journal of Fluid Mechanics

DOI

EISSN

1469-7645

ISSN

0022-1120

Publication Date

October 1, 2024

Volume

996

Related Subject Headings

  • Fluids & Plasmas
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 01 Mathematical Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Cheng, Z., Zhang, J. H., Wang, R., Lien, F. S., & Dowell, E. H. (2024). Asymmetric instability of flow-induced vibration for elastically mounted cube at moderate Reynolds numbers. Journal of Fluid Mechanics, 996. https://doi.org/10.1017/jfm.2024.690
Cheng, Z., J. H. Zhang, R. Wang, F. S. Lien, and E. H. Dowell. “Asymmetric instability of flow-induced vibration for elastically mounted cube at moderate Reynolds numbers.” Journal of Fluid Mechanics 996 (October 1, 2024). https://doi.org/10.1017/jfm.2024.690.
Cheng Z, Zhang JH, Wang R, Lien FS, Dowell EH. Asymmetric instability of flow-induced vibration for elastically mounted cube at moderate Reynolds numbers. Journal of Fluid Mechanics. 2024 Oct 1;996.
Cheng, Z., et al. “Asymmetric instability of flow-induced vibration for elastically mounted cube at moderate Reynolds numbers.” Journal of Fluid Mechanics, vol. 996, Oct. 2024. Scopus, doi:10.1017/jfm.2024.690.
Cheng Z, Zhang JH, Wang R, Lien FS, Dowell EH. Asymmetric instability of flow-induced vibration for elastically mounted cube at moderate Reynolds numbers. Journal of Fluid Mechanics. 2024 Oct 1;996.
Journal cover image

Published In

Journal of Fluid Mechanics

DOI

EISSN

1469-7645

ISSN

0022-1120

Publication Date

October 1, 2024

Volume

996

Related Subject Headings

  • Fluids & Plasmas
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 01 Mathematical Sciences