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Numerical study of free end effect of cylinder with low aspect ratios on vortex induced motion

Abstract

In this paper, numerical simulation is conducted via our in-house solver, vim-FOAM-SJTU, developed on open-source software, OpenFOAM. Flow around static rigid cylinders and elastically mounted rigid cylinder constrained to free stream with free end are numerically investigated. Some significant conclusions are made by analyzing the different results between cases with and without free end. The turbulence model is implemented with a shear stress transport-based (SST-based) improved delayed detached eddy simulation (IDDES) approach in the vim-FOAM-SJTU. Firstly, The paper starts with the application of the vim-FOAM-SJTU solver to flow past fixed cylinder with free end at Reynolds number 43 000. The numerical results are compared with experimental data. Comparison are satisfactory which implies the validity and accuracy of the current computational fluid dynamics (CFD) solver. The flow visualization in the vicinity of free-end is discussed. Subsequently, the solver is utilized to simulate the free end effect associated with the VIM of a cylinder submerged in current. The motion responses under different inflow velocities are studied. The relationship between transverse motion frequency, in-line motion frequency is discussed. Lastly, the effect of the free end on the vortex of the wake field is analyzed by comparing the 3-D vorticity diagrams of the free end cylinder. The responses of circular cylinder with or without free end are compared.

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Authors

Corresponding author

Correspondence to De-cheng Wan.

Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. 52131102, 51909160 and 51879159), the National Key Research and Development Program of China (Grant No. 2019YFB1704200).

Biography

Jia-wei He (1992-), Male, Ph. D. Candidate

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He, Jw., Zhao, Ww., Wan, Dc. et al. Numerical study of free end effect of cylinder with low aspect ratios on vortex induced motion. J Hydrodyn 34, 106–115 (2022). https://doi.org/10.1007/s42241-022-0011-x

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  • DOI: https://doi.org/10.1007/s42241-022-0011-x

Key words

  • Fluid-structure interaction
  • vim-FOAM-SJTU solver
  • vortex induced motion (VIM)
  • Three-dimensional character