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Mesh Independence Study Problems

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Old   September 12, 2019, 07:38
Default Mesh Independence Study Problems
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Calum Hewlett
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I am trying to run a mesh independence study on an under tray and diffuser for an FSAE car. I am measuring downforce along the diffuser edge as the parameter I am observing when refining the mesh. Specifically I am increasing the mesh density around the inlet and outlet of the under tray and diffuser I have tested 100000, 500000, 700000, and 1000000 elements. I have attached the screen capture from fluent post processing showing the velocity contour. It can be seen that as the mesh increases the output flow begins to form eddies. My downforce results are varying too much to conclude a reasonable mesh density to conduct further studies. Does anyone have any advice on how to resolve this problem, so that my downforce results to not fluctuate as much.

Nothing is being changed inbetween the simulations other than mesh density.
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aerodynamics, ansys fluent, downforce, racecar, venturi

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