Karman vortex streets on a turbulent flow with k-eps model ?
Posted: Fri Jun 08, 2012 1:46 pm
Hi all !
Is there any way to find Karman vortex streets on a turbulent flow around a cylinder with the standard k-epsilon turbulence model ?
For my investigation, I used a domain which consists in a rectangular box (1.25 x 0.3 x 1 m) with a cylinder (D = 0.05 m) and boundary conditions as follows :
- smooth wall conditions for the upper and lower side of the box as well as for the cylinder
- a symmetric condition for the left and right side of the box
- a constant inlet velocity with a normal direction to the inlet. U_inlet ( ~ 0.9 m/s) is computed in order to obtain a Reynolds number around 34000.
- turbulent kinetic energy : k ~ 2.55 10^-4 m^2/s^2
- turbulent dissipation rate : eps ~ 1.92 10^-4 m^2/s^3
For the physical properties of the fluid , I use a density of 1000 kg/m^3 and a viscosity of 0.00129 Pa.s.
... but without any success !
Moreover, I tried to use a rough wall condition for the cylinder instead of the smooth one, and it works great...
Any help would be greatly appreciated
Best regards,
Nicolas
Is there any way to find Karman vortex streets on a turbulent flow around a cylinder with the standard k-epsilon turbulence model ?
For my investigation, I used a domain which consists in a rectangular box (1.25 x 0.3 x 1 m) with a cylinder (D = 0.05 m) and boundary conditions as follows :
- smooth wall conditions for the upper and lower side of the box as well as for the cylinder
- a symmetric condition for the left and right side of the box
- a constant inlet velocity with a normal direction to the inlet. U_inlet ( ~ 0.9 m/s) is computed in order to obtain a Reynolds number around 34000.
- turbulent kinetic energy : k ~ 2.55 10^-4 m^2/s^2
- turbulent dissipation rate : eps ~ 1.92 10^-4 m^2/s^3
For the physical properties of the fluid , I use a density of 1000 kg/m^3 and a viscosity of 0.00129 Pa.s.
... but without any success !
Moreover, I tried to use a rough wall condition for the cylinder instead of the smooth one, and it works great...
Any help would be greatly appreciated
Best regards,
Nicolas