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incorrect drag and lift coefficient (smooth ball vs golf ball)

    • Jim Beet
      Subscriber

      I am conducting a simulation to compare the drag and lift coefficients of a smooth sphere and a golf ball under various rotational speeds and flow velocities. However, I have encountered difficulties with the smooth sphere simulation. The computed drag coefficient and lift coefficient differ significantly from those reported in previous studies. While past research indicates a decrease in the drag coefficient and an increase in the lift coefficient, my simulation results show the opposite trend. Specifically, I obtained a negative lift coefficient and a very small drag coefficient of 0.0216, which is substantially lower than the values reported in the literature (ranging between 0.4 to 0.5). I have checked my simulation setup, and the results appear to have converged. Could someone help me on what I am doing wrong.

       

    • Federico
      Ansys Employee

      Lift and drag coefficient will be highly dependent on surface mesh and boundary layer solution.

      How does your mesh look near the ball?

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