Large-eddy simulations of flow past a square cylinder using structured and unstructured grids

2016 ◽  
Vol 137 ◽  
pp. 36-54 ◽  
Author(s):  
Yong Cao ◽  
Tetsuro Tamura
Keyword(s):  
Unstructured Grids ◽  
Large Eddy Simulations ◽  
Square Cylinder ◽  
Flow Past ◽  
Large Eddy

scholarly journals Examination of Parameters Affecting Large-Eddy Simulations of Flow Past a Square Cylinder

AIAA Journal ◽  
2015 ◽  
Vol 53 (6) ◽  
pp. 1706-1712 ◽  
Author(s):  
M. R. Mankbadi ◽  
N. J. Georgiadis
Keyword(s):  
Large Eddy Simulations ◽  
Square Cylinder ◽  
Flow Past ◽  
Large Eddy

Large Eddy Simulations of Flow Past Two Pipelines in Tandem in Close Proximity to the Seabed

2017 ◽  
Author(s):  
Zhong Li ◽  
Mia Abrahamsen Prsic ◽  
Muk Chen Ong ◽  
Boo Cheong Khoo
Keyword(s):  
Drag Coefficient ◽  
Recirculation Zone ◽  
Separation Distance ◽  
Large Eddy Simulations ◽  
Plane Wall ◽  
Scale Model ◽  
Tandem Cylinders ◽  
Flow Past ◽  
Large Eddy ◽  
The Mean

Three-dimensional Large Eddy Simulations (LES) with Smagorinsky subgrid scale model have been performed for the flow past two free-spanning marine pipelines in tandem placed in the vicinity of a plane wall at a very small gap ratio, namely G/D = 0.1, 0.3 and 0.5. The ratio of cylinder center-to-center distance to cylinder diameter, or pitch ratio, L/D, considered in the simulations is taken as L/D = 2 and 5. This work serves as an extension of Abrahamsen Prsic et al. (2015) [1]. In essence, six sets of simulations have been performed in the subcritical Reynolds number regime at Re = 1.31 × 104. Our major findings can be summarized as follows. (1) At both pitch ratios, the wall proximity has a decreasing effect on the mean drag coefficient of the upstream cylinder. At L/D = 2, the mean drag coefficient of the downstream cylinder is negative since it is located within the drag inversion separation distance. (2) At L/D = 2, a squarish cavity-like flow exists between the tandem cylinders and flow circulates within the cavity. A long lee-wake recirculation zone is found behind the downstream cylinder at G/D = 0.1. However, a much smaller lee-wake recirculation zone is noticed at L/D = 5 with G/D = 0.1. (3) At L/D = 2, the reattachment is biased to the bottom shear layer due towards the deflection from the plane wall, which leads to the formation of the slanted squarish cavity-like flow where the flow circulates between the tandem cylinders.

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