Analysis of turbulence on cylinder with additional fairing with free surface

Siqin Chen (China University of Petroleum, Beijing, China)
Xiaomin Li (Yunnan Normal University College of Arts and Sciences, Kunming, China)

Abstract


In this study, two dimensional unsteady flow of cylinder and cylinder with additional fairing close to a free surface was numerically investigated. The governing momentum equations were solved by using the Semi Implicit Method for Pressure Linked Equations(SIMPLE). The Volume of Fluid(VOF) method applied to simulate a free surface. Non- uniform grid structures were used in the simulation with denser grids near the cylinder. Under the conditions of Reynolds number 150624, 210874, 210874 and 331373, the cylinders were simulated with different depths of invasion. It was shown that the flow characteristics were influenced by submergence depth and Reynolds numbers. When the cylinder close to the free surface, the drag coefficient, lift coefficient and Strouhal numbers will increase due to the effect of free liquid surface on vortex shedding. With additional fairing, can effectively reduce the influence of the free surface on the drag coefficient. Fairing will reduce lift coefficient at high Reynolds numbers, but increase lift coefficient when Reynolds numbers is small. Fairing can effectively reduce Strouhal numbers, thus can well suppress the vortex induced vibration.


Keywords


Numerical simulation; computational fluid dynamics (CFD); volume of fluid; free surface of liquid

Full Text:

PDF

References


[1]Schewe G. On the force fluctuations acting on a circular cylinder in cross flow from subcritical up to transcritical Reynolds numbers. J Fluid Mech 1983;133.265–85.

[2]Bearman, P. W. On vortex shedding from a circular cylinder in the critical Reynolds number regime. Journal of Fluid Mechanics, 1969,37(3), 577-585.

[3]Breuer, Michael. A challenging test case for large eddy simulation: high Reynolds number circular cylinder flow. International Journal of Heat and Fluid Flow, 2000, 21.5: 648-654.

[4]Yu D, Kareem A. Numerical simulation of flow around rectangular prism[J]. Journal of wind engineering and industrial aerodynamics, 1997, 67: 195-208.

[5]Suh J, Yang J, Stern F. The effect of air water interface on the vortex shedding from a vertical circular cylinder. ASME J Fluids Eng 2011; 27:1–22.

[6]Graf, W. H., & Yulistiyanto, B. Experiments on flow around a cylinder; the velocity and vorticity fields. Journal of Hydraulic Research, 1998,36(4), 637-654.

[7]Kawamura, T., et al. "Large eddy simulation of a flow past a free surface piercing circular cylinder." Transactions-American Society of Mechanical Engineers Journal of Fluids Engineering.124.1 (2002): 91-101.

[8]Wu, C.J., Wang, L., Wu, J.Z. Suppression of the von Kármán vortex street behind a circular cylinder by a travelling wave generated by a flexible surface. Journal of Fluid Mechanics, 2007, 574, 365-391.

[9]Kim J, Choi H. Distributed Forcing of Flow over a Circular Cylinder[J]. Physics of Fluids, 2005, 17: 033103 1-16.

[10]Wu Yucheng, Wu Shiyuan. ADINA-FSI analysis of vortex induced suppression effect of spiral strake and fairing[J]. China Petroleum and Chemical Standards and Quality, 2013,07:65.



DOI: https://doi.org/10.30564/jmer.v4i1.2643

Refbacks

  • There are currently no refbacks.
Copyright © 2021 Siqin Chen Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.