“…Probably the result of the effect described. I think there is also a term used by tugboaters called "bank suction" which happens if a moving barge gets too close to the shallow side of a channel and it pulls the barge closer to the shore”.
It’s Bernoulli’s Principle or the Bernoulli Effect, e.g. this short summary: http://scienceworld.wolfram.com/physics/BernoulliEffect.html
Or “For horizontal fluid flow, an increase in the velocity of flow will result in a decrease in the static pressure. The equation describing this effect is known as Bernoulli's law. The most practical example of this is in the action of an airfoil. The shape of an airplane wing is such that air flowing over the top of the wing must travel faster than the air flowing under the wing, and so there is less pressure on the top than on the bottom, resulting in lift.”
So, whether it’s a car with very low underbody or a venturi in a carburetor or a boat zipping by a shoreline or another boat, the effect is the same---creation of a relative low pressure or vacuum where the stream flow necks down. In the case of the low pan car, this causes the car to suck down to the ground---in the case of the boats, it results in the boat being sucked to the side of the narrowest and fastest relative stream flow.
-mt
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