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Just as an FYI for everyone doing CFD. The more correct the data you feed your simulation the more accurate results you will get.
I have been playing with the model of my car to get it right. I just did a check on the underbody airflow. At the bottom of the picture you can see where I have made the front wheel well more like my car. It has less flow separation (and less drag) than the front wheel at the top of the picture. Also the stream lines diverge less from the lower front wheel (also indicating less drag). Small changes can have a big impact on what your being shown and thus the conclusions you make from your model.
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