I am running a drag and lift prediction for flow over an ahmed body and Star-CCM+ consistently gives me under predicted values by around 20%. I have tried changing turbulence models and refining the mesh in the wake but neither helped. My question - what are some basic steps I can take to diagnose the problem?
still need help
I have provided these images if they can be of use determining my issues.
Centreline Velocity Magnitude
Velocity Magnitude from a different piece of software (correct!)
Streamlines from Literature
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