Open Source Field Operation and Manipulation

1. Open Source Field Operation and Manipulation

2. What is OpenFOAM? • OpenFOAM is a library of C++ codes that solve partial differential equations • Incompressible flow (Navier-Stokes) • Compressible flow (Navier-Stokes) • Solid displacement (Elasticity) • Pricing stock options (Black-Scholes)

3. How does OpenFOAM work?

4. How does OpenFOAM work? • Editing input files in case folder • Preprocessing • Utilities • Fluid properties • Turbulence properties • Meshing

5. How does OpenFOAM work? • Editing input files in case folder • Solving • Discretization schemes • Numerical Methods • Parallel processing • Creates output files for each write step • Velocity, pressure, turbulence properties, temperature, displacement

6. How does OpenFOAM work? • Postprocessing • paraFOAM • Reads output files created when solving • Uses paraView • Displays flow properties within the domain • Various filters • Cut into domain • Vector plots • Contour plots • Plot cell centers • Create image and video files

7. 2D Poisuille Flow • Geometry and fluid properties • Length L = 0.1 m • Width 2h = 0.01 m • Origin located at the inlet along the centerline • Uniform velocity of 0.01 m/s at the inlet • Uniform pressure of 0 Pa at the outlet • Density of ρ = 1.205 kg/m3 • Dynamic viscosity of μ = 1.82 x 10-5 Pa-s

8. 2D Poisuille Flow • Analytical Solution • Pressure Gradient • -0.02184 Pa/m • Maximum velocity • 0.015 m/s • Average velocity • 0.01 m/s

9. 2D Poisuille Flow • Numerical Solution – Mesh • Cells are clustered at the channel entrance and walls

10. 2D Poisuille Flow Numerical Solution – Pressure Gradient

11. 2D Poisuille Flow Numerical Solution – Pressure Gradient

12. 2D Poisuille Flow Numerical Solution – Velocity Profile (uniform)

13. 2D Poisuille Flow Numerical Solution – Velocity Profile (graded)

14. 2D Poisuille Flow Numerical Solution – Velocity Profile (comparisson)

15. 2D Laminar Flow Over Cylinder • Metric • Drag coefficient • Strouhal Number (vortex shedding) • Variable • Reynolds number • Meshes • Boundary conditions

16. 2D Laminar Flow Over Cylinder First mesh

17. 2D Laminar Flow Over Cylinder First Velocity Field

18. 2D Laminar Flow Over Cylinder Second Mesh

19. 2D Laminar Flow Over Cylinder Second Velocity Field

20. 2D Laminar Flow Over Cylinder Discontinuities

21. 2D Laminar Flow Over Cylinder Third Mesh

22. 2D Laminar Flow Over Cylinder Third Velocity Field (discontinuities)

23. 2D Laminar Flow Over Cylinder • Fifth and Sixth meshes • Results are invariant to cell density

24. 2D Laminar Flow Over Cylinder Velocity Field

25. 2D Laminar Flow Over Cylinder Drag Coefficient

26. 2D Laminar Flow Over Cylinder • Strouhal Number • Lift Coefficient

27. Lid-Driven Cavity Flow • Start-to-finish walkthrough • Linux in general • Laminar • Turbulent • Mesh density • Grading • Numerical Schemes • paraFoam