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Fluids

Fluids

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Negative Drag

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    • May 3, 2024 at 1:19 am
      dkmenend
      Subscriber

      Hi I am running a simple case of external flow over a solar car. airspeed 17.88 m/s, moving ground -17.88m/s (in positive z axis) (to simulate road). Reference value for area is 0.6227 which is in the correct axis (z axis) and refernce vel is (17.88m/s) both computed from the car. I am getting a coef of drag of  -0.1105. I am confused as to why I am getting a negative value. Any ideas? 

    • May 3, 2024 at 9:11 am
      Rob
      Forum Moderator

      It's usually linked to the reference values. However, check the force reports (forces and not coefficients) to see what's happening. 

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