Experimental study on the hydrodynamic characteristics of cylinder with rough surface

Abstract

The main purpose of this study is to establish a better understanding of the relationship between the hydrodynamic characteristic and cylinder with rough surface. Experiments were conducted to measure the force and the hydrodynamic efficient of a circular cylinder with different types of artificial rugged surface. The relative roughness coefficient ranged from k/D = 0.00005–0.02 (k is the roughness height, D is the outer diameter of cylinder) is used to evaluate the rough surface of experiment model. Wave and current experiments are conducted in the wave tank. Results show that relative roughness indeed plays an important role in affecting the hydrodynamic characteristic on the cylinder. For the drag coefficient (Cd) in current experiment, Cd enlarges a lot under the effect of rough surface compared with smooth cylinder and has a regular change with relative roughness. For the inertia coefficient (CM) in wave experiment, CM is greatly affected by the rough cylinders for small KC numbers. For the Cd in wave experiment, it is greatly affected by large rough cylinders.

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Acknowledgements

The research was supported by National Natural Science Foundation of China (Grant Nos. 51609223, 51606178), Key R&D Program Project of Shandong Province (Grant No. 2019GHY112038), Natural Science Foundation of Shandong Province of China (Grant No. ZR2019BEE072), and National Science Fund for Distinguished Young Scholars (Grant No. 51625902).

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Correspondence to Guijie Liu.

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Tian, X., Li, D., Liu, G. et al. Experimental study on the hydrodynamic characteristics of cylinder with rough surface. J Mar Sci Technol 25, 842–848 (2020). https://doi.org/10.1007/s00773-019-00684-7

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Keywords

  • Hydrodynamic characteristic
  • Relative roughness
  • Rough cylinder
  • Drag coefficient
  • Inertia coefficient