SPH modelling of viscous flow past a circular cylinder interacting with a free surface

2017 ◽  
Vol 146 ◽  
pp. 190-212 ◽  
Author(s):  
Benjamin Bouscasse ◽  
Andrea Colagrossi ◽  
Salvatore Marrone ◽  
Antonio Souto-Iglesias
Keyword(s):  
Free Surface ◽  
Circular Cylinder ◽  
Viscous Flow ◽  
Flow Past

Viscous Flow Past a Circular Cylinder Below a Free Surface

2014 ◽  
Author(s):  
Benjamin Bouscasse ◽  
Andrea Colagrossi ◽  
Salvatore Marrone ◽  
Antonio Souto-Iglesias
Keyword(s):  
Free Surface ◽  
Circular Cylinder ◽  
Vortex Shedding ◽  
Mixing Processes ◽  
Surface Evolution ◽  
Flow Past ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Karman Vortex ◽  
Drag And Lift

Flow past a circular cylinder close to a free surface at low Reynolds and large Froude numbers is investigated numerically using the Smoothed Particle Hydrodynamics model. This meshless method allows for a non-diffusive computation of the free surface evolution, even while breaking and fragmentation may occur. The distance of the cylinder to the free surface, submergence, is varied in order to investigate the detached flow patterns dependence with this factor. Vorticity shed by the cylinder, vortex generation due to free surface breaking, mixing processes, and drag and lift coefficients behavior are discussed. It has been found that, for small submergences, the classical Von Karman vortex shedding from the cylinder does not take place. In turn, moderate vortex shedding occurs, departing not from the cylinder but from vorticity generated at the free surface. This shedding takes places simultaneously with the transport of free surface fluid elements into the bulk of the fluid. It has been also found that for even smaller depth ratios, a vorticity layer remains spatially localized between the cylinder and the free surface, and a stagnation recirculating area develops behind the cylinder. Results are compared with literature finding reasonable qualitatively agreement with experimental works conducted with similar geometrical configuration but larger Reynolds number.

Large-eddy simulations of flow past a circular cylinder near a free surface

2021 ◽  
Vol 33 (11) ◽  
pp. 115108
Author(s):  
Feng Zhao ◽  
Rui Wang ◽  
Hongbo Zhu ◽  
Huang Ping ◽  
Yan Bao ◽  
...  
Keyword(s):  
Free Surface ◽  
Circular Cylinder ◽  
Large Eddy Simulations ◽  
Flow Past ◽  
Large Eddy

scholarly journals A numerical study of steady viscous flow past a circular cylinder

1980 ◽  
Vol 98 (4) ◽  
pp. 819-855 ◽  
Author(s):  
Bengt Fornberg
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
Viscous Flow ◽  
Numerical Solutions ◽  
Numerical Study ◽  
Reynolds Numbers ◽  
Iteration Scheme ◽  
The Body ◽  
Flow Past ◽  
A New Technique

Numerical solutions have been obtained for steady viscous flow past a circular cylinder at Reynolds numbers up to 300. A new technique is proposed for the boundary condition at large distances and an iteration scheme has been developed, based on Newton's method, which circumvents the numerical difficulties previously encountered around and beyond a Reynolds number of 100. Some new trends are observed in the solution shortly before a Reynolds number of 300. As vorticity starts to recirculate back from the end of the wake region, this region becomes wider and shorter. Other flow quantities like position of separation point, drag, pressure and vorticity distributions on the body surface appear to be quite unaffected by this reversal of trends.

Low Reynolds Flow Past a Circular Cylinder Close to a Free-Surface With Vertical Motion Dynamics

2016 ◽  
Author(s):  
Jose L. Cercos-Pita ◽  
Andrea Colagrossi ◽  
Antonio Souto-Iglesias
Keyword(s):  
Free Surface ◽  
Circular Cylinder ◽  
Lift Coefficient ◽  
Flow Characteristics ◽  
Vertical Motion ◽  
Bluff Bodies ◽  
Flow Past ◽  
Low Reynolds ◽  
Work Done ◽  
Large Response

Flow past a circular cylinder close to a free surface at low Reynolds number is investigated numerically in this paper extending the work done in previous 2014 and 2015 OMAE papers [1, 2]. In the former, the dependence of the flow with the submergence was discussed and in the latter the flow at high Froude numbers was investigated. It was found that shedding is blocked as the cylinder approaches de free surface with an increasing value of the net lift coefficient and a reduction of the lift alternate oscillations due to such shedding. This variation on the lift pattern suggests that if a VIVACE device [3] is set under these flow characteristics, its performance will significantly differ from that in deep water conditions. These devices take advantage of flow induced motions in bluff bodies (such as the cylinder) to generate electric power. Singh & Mittal [4] coupled VIV system is studied in present paper in the presence of a free surface, selecting a configuration with large response in unbounded flow and adding a free-surface to such case. Results are presented and discussed.

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