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Tutorial 2 A Finite Cylinder in a Wind Tunnel

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Tutorial 2 A Finite Cylinder in a Wind Tunnel

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    1. Tutorial 2 A Finite Cylinder in a Wind Tunnel Xin Yan

    2. Show the regular access to external flow Set up a turbulent problem Expressions Additional choices for deal with the result 2 Objectives

    3. A finite cylinder in a wind tunnel Problem Description 3

    4. Geometry: DesignModeler Pre-processor Mesh: CFX-Meshing CFX-Pre Solver CFX-Solver Post-processor CFX-Post Simulation Process 4

    5. ANSYS workbench:DesignModeler (.agdb) Modeling Wind tunnel: Cylinder: Cut material Geometry 5

    6. ANSYS workbench:DesignModeler (.agdb) Modeling Wind tunnel: Cylinder: Cut material Geometry 6

    7. ANSYS workbench: CFX-Mesh Specify regions Set spacing for regions Inflation mesh Generate the surface & volume mesh Meshing 7

    8. ANSYS workbench: CFX-Mesh Specify regions Set spacing for regions Inflation mesh Generate the surface & volume mesh Meshing 8

    9. ANSYS workbench: CFX-Pre Create a domain Set up boundary conditions Set solver control Simulation: CFX-Pre 9

    10. ANSYS workbench: CFX-Pre Create a domain Set up boundary conditions Set solver control Simulation: CFX-Pre 10

    11. ANSYS workbench: CFX-Pre Create a domain Set up boundary conditions Set solver control Simulation: CFX-Pre 11

    12. Simulation: CFX-Solver 12

    13. Why? Increase accuracy Where? Near wall area where you are interested in. How? Insert inflated boundary. 13 Inflation

    14. Inlet 14 How to decide boundary condition

    15. Outlet & Opening Outlet: the flow is predominantly directed out of the domain. Opening: allows the fluid to cross the boundary surface in either direction. Wall No-slip: velocity of the fluid at the wall boundary is set to zero. Free-slip: the velocity component parallel to the wall has a finite value (which is computed), but the velocity normal to the wall is zero. Symmetry 15 How to decide boundary condition

    16. Simulation: CFX-Solver 16

    17. ANSYS Workbench: CFX-post Contour and vector of velocity in the plane of z=0.5m. Simulation: CFX-Post 17

    18. ANSYS Workbench: CFX-post 2) Streamline of velocity in the plane of y=1.5m. Simulation: CFX-Post 18

    19. ANSYS Workbench: CFX-post 3) Streamline of 2-D velocity (v&w) in the plane of x=0.58m. Simulation: CFX-Post 19

    20. ANSYS Workbench: CFX-post 4) Contour of turbulence kinetic energy (k) and vorticity (?x) in the plane of x=0.58m. Simulation: CFX-Post 20

    21. ANSYS Workbench: CFX-post 5) Quick animation Streamlines Planes Simulation: CFX-Post 21

    22. Finish the simulation Capture the picture of streamline with two vortexes in the plane parallel to the plate. Capture another picture which you are interested in and give a brief introduction of this picture, include the plane location and the feature in the picture. Due day: 13/10/2010 22 Assignment

    23. Questions 23

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