Hydrodynamic Forces From Combined Wave and Current Flow on Smooth and Rough Circular Cylinders at High Reynolds Numbers

1984 ◽  
Author(s):  
T. Sarpkaya ◽  
C. Bakmis ◽  
M.A. Storm
Keyword(s):  
Current Flow ◽  
Reynolds Numbers ◽  
Hydrodynamic Forces ◽  
Circular Cylinders ◽  
High Reynolds Numbers ◽  
High Reynolds

scholarly journals Vortex induced vibrations at high Reynolds numbers on circular cylinders

2015 ◽  
Vol 94 ◽  
pp. 140-154 ◽  
Author(s):  
M. Belloli ◽  
S. Giappino ◽  
S. Morganti ◽  
S. Muggiasca ◽  
A. Zasso
Keyword(s):  
Reynolds Numbers ◽  
Circular Cylinders ◽  
High Reynolds Numbers ◽  
Vortex Induced Vibrations ◽  
High Reynolds

Study of Viscous Crossflow Effects on Circular Cylinders at High Reynolds Numbers

AIAA Journal ◽  
1980 ◽  
Vol 18 (9) ◽  
pp. 1066-1072 ◽  
Author(s):  
W. D. James ◽  
S. W. Paris ◽  
G. N. Malcolm
Keyword(s):  
Reynolds Numbers ◽  
Circular Cylinders ◽  
High Reynolds Numbers ◽  
High Reynolds

Model Test on Drag of Cylinders With Helical Grooves at High Reynolds Numbers

2010 ◽  
Author(s):  
Shan Huang ◽  
Neil Kitney
Keyword(s):  
Model Test ◽  
Cross Flow ◽  
Reynolds Numbers ◽  
Circular Cylinders ◽  
Tank Model ◽  
Towing Tank ◽  
High Reynolds Numbers ◽  
High Reynolds ◽  
Helical Grooves ◽  
Four Cylinders

Towing tank model tests at high Reynolds numbers, up to 1.1×106, were carried out in order to investigate the effects of the triple-starting helical grooves on drag reduction of smooth and rough circular cylinders in uniform cross flow. In total, four cylinders were tested including smooth and rough cylinders with and without helical grooves.

Examination of Hydrodynamic Forces Acting on a Group of Circular Cylinders at High Reynolds Numbers

2016 ◽  
Author(s):  
Linwei Shen ◽  
Rajeev Kumar Jaiman ◽  
Peter Francis Bernad Adaikalaraj ◽  
Vaibhav Joshi ◽  
Jungao Wang ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Reynolds Numbers ◽  
Hydrodynamic Forces ◽  
Circular Cylinders ◽  
Navier Stokes ◽  
Incoming Flow ◽  
Drag Coefficients ◽  
Numerical Result ◽  
High Reynolds ◽  
Engineering Practices

A group of circular cylinders exists in many engineering practices, such as offshore drilling riser system. Due to the interference between the riser main tube and auxiliary lines, the hydrodynamic forces acting on the riser system is much different from those on a single circular cylinder. It is very rare in the publication and still not certain in the determination of the forces in the drilling riser design of the industry. Particularly, it is unclear of the hydrodynamic forces when the Reynolds number is very high which is quite common in the real ocean fields. In this paper, the stationary riser system consisting of a group of six circular cylinders with unequal diameters is considered. The hydrodynamic forces acting on the main cylinder in the Reynolds number ranging from 105 to 2×106 are numerically calculated by solving the Reynolds averaged Navier-Stokes (RANS) equations. The Spalart-Allmaras RANS model is employed to account for the turbulence effect. It is found that drag coefficients are close to 1 when the incoming flow is symmetrical with respect to the configuration of the cylinders and are dramatically reduced when the incoming flow is asymmetrical. No “drag crisis”, which is a well-known phenomenon in a single cylinder case, is found in this particular range of Reynolds numbers. A detailed analysis, including the flow field and pressure distribution around the main tube, is also presented in the present work. The numerical result of the hydrodynamic forces on the main line is very helpful for the engineers to determine the drag coefficients in the practice of drilling riser system design, under the guidance of API-RP-16Q.

Sign in / Sign up

Export Citation Format

Share Document