Measuring mass flow rate through a surface

    • Fernando Hernández

      Hi there!

      I am currently performing a 3D analysis of a Formula Student car. The objective is to measure the air mass flow rate that passes through the sidepods, so I have created a surface at the sidepod entry and I have defined a Surface -> Mass Flow Rate report on that surface.

      The X velocity contour can be seen in the attached picture (I have assumed that the dark spots are just a visual glitch, but maybe I'm wrong). The area of the surface is around 0.1 m2. So according to my calculations the mass flow rate through it should be around 1 kg/s.


      However, as seen in the next picture, the resulting mass flow rate varies between 0.015 and 0.025 kg/s.

      Am I doing something wrong? Is this mass flow rate measuring method incorrect?

      I would appreciate any help. Thank you in advance.

      Kind regards!


    • Rob
      Ansys Employee

      You may need to run a few more iterations. Most real models don't converge in 180 iterations. How do the residuals look?

      Please replot the contour with node values off, that's a good way to check the mesh resolution. 

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