why when the window is open in a car the wind comes in so sporadically when driving
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Modern cars are designed to create as little drag as possible. This means the air flows as smoothly and uninterrupted as possible around the car. This means when you create a void for the flow to “fall” into, the air flow has to fall enough to divert into the car by hitting another surface, like the door pillar at the back of the window opening. When moving at speed, most of the flow is going fast enough to go over the window opening and hit the back window and continue on, same as it was going to. Only a little falls into the opening.
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