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Even bigger aero numbers!
We're back on the er8 project, now targeting WTAC 2023! A lot has changed since the previous update, such as running CFD on a server optimized for it. Over 10x faster, and much easier to manage updates on a shared memory system like this, compared to running our previous distributed system. Computer tech has come a long way!
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We successfully ran a 18.2 million cell CFD case on our newest GT model, which includes the engine, gearbox, differential, shafts etc. This is the closest detail level to a production car we will be running CFD calculations on.
The finer mesh seems to have improved the quality of the results since the calculation converged much sooner with the finer mesh.
Downforce: 5431N
Drag: 1101.8N
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We are satisfied with the numbers the last aero kit produced and are now focusing on creating a production capable model.
None of our previous aero kits included the engine/gearbox/drivetrain, we added these to the last kit and it dramatically reduced the downforce value to around 4000N. However, we can sacrifice the weight distribution a bit to gain some(most) of the lost downforce. This is partly possible due to the small 1l engine we will be using which allows us to place it quite freely.
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We adjusted the new model slightly. The new diffuser design produces massive values in the CFD calculations. With a design that is based on a stock car we have a considerably better downforce/drag-ratio than the group C Le-mans prototypes before the rule changes. The Nissan P35 at best achieved a downforce/drag-ratio of 5.36. Our most recent value is 5.69.
As for how realistic our CFD values are, we won't really know until we are able to take the car to the track.
Downforce: 6303N
Drag: 1107N
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We had a great idea and completely redid the diffuser. The new diffuser produced a much larger low-pressure area than before and thus produced much more downforce than any of the previous versions. We can likely further improve the model with a few small changes so we will continue the development.
New values:
Downforce: 5714N
Drag: 1056N