Control of an Incompressible Turbulent Flow Past a Circular Cylinder Computed by Large Eddy Simulation

2002 ◽  
Author(s):  
Guillaume Fournier ◽  
Ste´phanie Pellerin ◽  
Loc Ta Phuoc
Keyword(s):  
Circular Cylinder ◽  
Turbulent Flow ◽  
Large Eddy Simulations ◽  
Control Methods ◽  
Aerodynamic Coefficients ◽  
Boundary Layer Suction ◽  
Eddy Simulation ◽  
Flow Past ◽  
Large Eddy ◽  
Cylinder Rotation

Large Eddy Simulations are performed on a turbulent flow past a circular cylinder with control using velocity-vorticity formulation. The effect of two control methods is analyzed considering aerodynamic coefficients. The influence of rotation and suction velocities is studied. The cylinder rotation and the boundary layer suction induce a lift creation and an increase of lift with control magnitude. Lift value also depends strongly on the suction location which has to be in the vicinity of the separation point.

Large-eddy simulation of turbulent flow past wind turbines/farms: the Virtual Wind Simulator (VWiS)

Wind Energy ◽  
2014 ◽  
Vol 18 (12) ◽  
pp. 2025-2045 ◽  
Author(s):  
Xiaolei Yang ◽  
Fotis Sotiropoulos ◽  
Robert J. Conzemius ◽  
John N. Wachtler ◽  
Mike B. Strong
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Flow ◽  
Wind Turbines ◽  
Eddy Simulation ◽  
Flow Past ◽  
Large Eddy

Detailed Investigation of Detached-Eddy Simulation for the Flow Past a Circular Cylinder at Re=3900

2012 ◽  
Vol 232 ◽  
pp. 471-476 ◽  
Author(s):  
Rui Zhao ◽  
Chao Yan
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
Flow Structures ◽  
Detached Eddy Simulation ◽  
Eddy Simulation ◽  
Flow Past ◽  
Large Eddy ◽  
Mesh Resolution ◽  
Physical Phenomena

The flow past a circular cylinder at a subcritical Reynolds number 3900 was simulated by the method of detached-eddy simulation (DES). The objective of this present work is not to investigate the physical phenomena of the flow but to study modeling as well as numerical aspects which influence the quality of DES solutions in detail. Firstly, four typical spanwise lengths are chosen and the results are systematically compared. The trend of DES results along the span increment is different from previous large-eddy simulation (LES) investigation. A wider spanwise length does not necessary improve the results. Then, the influence of mesh resolution is studied and found that both too coarse and over refined grids will deteriorate the performance of DES. Finally, different orders of numerical schemes are applied in the inviscid fluxes and the viscous terms. The discrepancies among different schemes are found tiny. However, the instantaneous flow structures produced by 5th order WENO with 4th order central differencing scheme are more abundant than the others. That is, for the time-averaged quantities, the second-order accurate schemes are effective enough, whereas the higher-order accurate methods are needed to resolve the transient characteristics of the flow.

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