Quote:
Originally Posted by gtengr
Right, but it's nearly always modeled as the hood running into the windshield as if it's a simple obtuse-angled corner, ignoring the void area that is recessed towards the front of the car and under the rear of the hood. And the influence of an engine bay that has trapped a lot of air that wants to escape is also generally ignored. The Corvette example I pointed to earlier, while it is a different car, demonstrates that the high pressure area doesn't necessarily have to travel below the hood line and towards the front of the car. I'm not trying to say that I'm right, because I do understand your point. I just haven't seen enough to convince me it is 100% factual in this case.
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Going back to your case, I have attached the same picture with some arrows to point out areas.
Red Arrow: Best for evacuation, lowest pressure
Orange Arrow: Good for evacuation, low pressure
Yellow Arrow: Worst place for evacuation on the entire hood. This location has the highest pressure and would result in the least productive evacuation. Likely air would actually make its way *into* the engine bay.
People reduce complexity on CFD models to aid in solving. There are industry standards (followed by OE's, privateers, and race teams) that are accepted because they do not result in incorrect results.
Hope that helps,
Eric