Quote:
Originally Posted by tjts1
Why are we using 2,500,000?
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Because I said so apparently. But I said so because it is about right for an automobile. All that really matters is that the Re is in the millions range. Variations within that range shouldn't affect the flow.
But if you want a more official source,
The Reynolds number
As for the white area, the flow needs some room to develop before it hits your car. Otherwise you will get bad results.