From an external standpoint, the most significant change to the Williams car for 2018 appears to be the sidepod area. The intake is preceded by an array of fins, much like the 2017 Ferrari, into which Dirk de Beer had a large input. The first thing to note is that the entire sidepod intake has been raised significantly, now being almost half its previous height.
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This requires a very good cooling package in order to avoid overheating, but the benefit is less impact of front tyre turbulence on internal airflows, reducing drag. Ahead of the intake, the upper two vanes seem to be aimed at directing the flow downwards, in the direction of the initial sidepod slope, ensuring the smoothest possible flow entry.
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A more global view of the new sidepods provides a greater insight into how they might work. The blue arrow above indicates the direction of flow exiting the bargeboards, which is trying to pull the front tyre wake as far outwards as possible, around the rear tyres. Meanwhile, the extremely narrow new sidepod design provides more space between the rear wheel and bodywork for airflow to travel through, making this path ‘more attractive’. Overall therefore, it is possible that there is less airflow heading towards the rear tyres, lowering their negative consequences in terms of drag and squirting flow laterally into the diffuser’s path.
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