On the behavior of nonlinear hydrodynamic coefficients of a submerged cylinder beneath the water surface

Authors

  • Nguyen Van My The University of Danang - University of Science and Technology, Da Nang, Vietnam
  • Le Anh Tien The University of Danang - University of Science and Technology, Da Nang, Vietnam
  • Phan Hoang Nam The University of Danang - University of Science and Technology, Da Nang, Vietnam https://orcid.org/0000-0002-8108-5522
  • Nguyen Quoc Khanh The University of Danang - University of Science and Technology, Da Nang, Vietnam https://orcid.org/0000-0003-2959-081X
  • Chau Van Than The University of Danang - University of Science and Technology, Da Nang, Vietnam
  • Phan Thanh Hoang School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea https://orcid.org/0000-0002-5724-3690

DOI:

https://doi.org/10.15625/0866-7136/16613

Keywords:

submerged cylinder, free surface flow, two-phase mixture model, nonlinear hydrodynamic coefficient, VOF method

Abstract

This study aims at numerically exploring the behavior of flow fields and nonlinear hydrodynamic coefficients of a horizontal cylinder beneath the free surface flow considering the effects of nonlinear surface waves and various cylinder shapes. The computational model is based on two-dimensional incompressible Navier-Stokes solvers along with the treatment of the free surface flow using the volume of fluid method. The effect of the turbulent flow is also considered by using the shear stress transport turbulence model. The simulation result of a benchmark case study of the submerged cylinder is first validated with available experiment data, where a mesh convergence analysis is also performed. Afterward, the flow fields and hydrodynamic force coefficients around the cylinder surface are analyzed, and the influences of various cylinder shapes and Reynolds numbers on the hydrodynamic coefficients are investigated. A state diagram representing the hydrodynamic behavior including stable and unstable stages is finally proposed; this is an important criterion for the practice design of submerged civil structures under the free surface flow.

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Published

20-12-2021

How to Cite

My, N. V., Tien, L. A., Nam, P. H., Khanh, N. Q., Than, C. V., & Hoang, P. T. (2021). On the behavior of nonlinear hydrodynamic coefficients of a submerged cylinder beneath the water surface. Vietnam Journal of Mechanics, 43(4), 371–387. https://doi.org/10.15625/0866-7136/16613

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Research Article