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Fluids

Fluids

Topics related to Fluent, CFX, Turbogrid and more.
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  3. Too high cd values

Too high cd values

    • July 21, 2021 at 5:47 pm
      toni1398
      Subscriber

      I am running some cfd test to a motorbike in fluent 19.0 and I dont know why the cd values are so high (in the order of 10^7)

    • July 22, 2021 at 6:44 am
      aitor.amatriain
      Subscriber
      Could you please give us more information? Contours of the mesh and velocity, pressure, BCs, reference values for Cd...
    • July 22, 2021 at 8:49 am
      Rob
      Forum Moderator
      Especially the latter - everyone misses that.
    • July 22, 2021 at 11:31 am
      toni1398
      Subscriber
      bc: velocity inlet, pressure outlet, ground and sky moving walls, symmetry
    • July 22, 2021 at 1:07 pm
      Rob
      Forum Moderator
      Have a look in the various NACA aerofoil examples (there's probably on in the Help system in the newer releases). You need to alter the reference values to suit the model.
    • July 22, 2021 at 4:44 pm
      toni1398
      Subscriber
      moreover when I try to add rotationary movement to the wheels this happens: too high speeds in one of them. do you know what i could fix?

    • July 23, 2021 at 12:36 pm
      Rob
      Forum Moderator
      Assuming you set the centre of rotation and axis correctly check the spacing and mesh resolution between the tyre and mud guard.
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