Fluids

Fluids

How to change airfoil angle of attack without redrawing and remeshing?

    • Osama1998
      Subscriber

      Hello Im using ansys 2020 R2 , Im modelling Naca 0012 at 0 AOA I got good results cd 0.0062 and cl 0.00007 , which is good, but when I canged the AOA to 3 degrees from the inlet velocity , I setit to "magnitude and direction" my manitude is the same 43.8 , x- component is sin3 and y component is -cos3 , I got very bad results CD went to 0.0011 and CL 0.17 which not logical or accurate, what can I be doing wrong.

    • Robert Woolhouse
      Ansys Employee
      If you plot the velocity how does it look?
    • Osama1998
      Subscriber

      velocity residuals seem to be smooth
      Is this what you meant?
    • Robert Woolhouse
      Ansys Employee
      No, the velocity vector plot. We can use that to check the flow is going where you think it is.
    • DrAmine
      Ansys Employee
      You can use dynamic mesh for that. Save case file first. Then Enable Dynamic Mesh (after you switch to transient), Under your cell zone add mesh motion and provide Rotational Speed and direction of rotation, In dynamic mesh panel run single time step a 1 second to rotate the mesh by previewing mesh motion. Save new case after you switch off dynamic mesh and transient. Other idea is to create Fluent Expressions where you incorporate the AoA in your velocity profile prescription!
    • DrAmine
      Ansys Employee
      Your question title has nothing to do with the problem you are describing by the way!
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