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Effect of Flow over a Cylinder MAE 5130 Viscous Flow Final Project

Effect of Flow over a Cylinder MAE 5130 Viscous Flow Final Project. By Shreya Raje. Introduction. Formation of wake Vortex Shedding. Objective. To find the effect of flow over a cylinder in terms of following parameters: Pressure Velocity Vorticity.

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Effect of Flow over a Cylinder MAE 5130 Viscous Flow Final Project

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  1. Effect of Flow over a CylinderMAE 5130 Viscous FlowFinal Project By Shreya Raje

  2. Introduction • Formation of wake • Vortex Shedding

  3. Objective • To find the effect of flow over a cylinder in terms of following parameters: • Pressure • Velocity • Vorticity

  4. Approach For this a two dimensional circular cylinder is drawn along with the direction of flow field perpendicular to its axis in gambit. Flow Field Inlet Velocity Cylinder Pressure Outlet Wall Periodic

  5. Meshing

  6. Parameters for Calculations for Laminar Flow • An unsteady flow condition was selected to compute the parameters. • Consider Flow Field to be Water • Velocity (U) 0.5024 m/s • Density (ρ) 998.2 kg/cubic m • Kinematic Viscosity (µ) 0.001003 kg/m-s • Cylinder Diameter (D) 0.25m • Area of each Cylinder (A) 0.5 sq m • Renolds number (Re) = (UxDxρ)/µ =2.5x105

  7. To see the effect of vortex shedding the frequency is calculated with Strouhal Number as 0.2 Strouhal Number, St= fxD/U f=0.20096 hz Cycle time,t=1/f=4.976sec time step size=4.976/25 =0.199sec Parameters for Calculations for Laminar Flow

  8. Contour of Static Pressure for Laminar Flow

  9. Contour of Velocity Magnitude For Laminar Flow

  10. Contours of Vorticity Magnitude For laminar Flow

  11. Path lines with Vorticity Magnitude for Laminar Flow

  12. Parameters for Calculations for Turbulent Flow • An unsteady flow condition was selected to compute the parameters. • Consider Flow Field to be Water • Velocity (U) 2.5 m/s • Density (ρ) 998.2 kg/cubic m • Kinematic Viscosity (µ) 0.001003 kg/m-s • Cylinder Diameter (D) 0.25m • Area of each Cylinder (A) 0.5 sq m • Renolds number (Re) = (UxDxρ)/µ = 1.244x106

  13. To see the effect of vortex shedding the frequency is calculated with Strouhal Number as 0.2 Strouhal Number, St = fxD/U f = 1hz Cycle time,t=1/f=1sec Time Step Size=1/25=0.04sec Parameters for Calculations for Turbulent Flow

  14. Contour of Static Pressure for Turbulent Flow

  15. Contour of Velocity Magnitude For Turbulent Flow

  16. Contours of Vorticity Magnitude For Turbulent Flow

  17. Path lines with Vorticity Magnitude for Turbulent Flow

  18. Results And Conclusion

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