# Bernoulli to explain Magnus Effect

Hi

I have been reading some internet articles that state the Bernoulli equation does NOT explain the Magnus Effect. The articles state that the effect is due to circulation (Bernoulli requires inviscid flows)

Could someone explain the cause of the Magnus effect without reference Bernoulli's equation?

In other words, I pieced this together from reading... If this is true, could someone elaborate and then explain the cause of the effect?

Many attribute the effect to Bernoulli’s equation wherein fast moving fluid. However, Bernoulli’s principle doesn’t cause anything. It is a calculation scheme. It lets one calculate the pressure when you know the velocity. It has restrictions in its use. It is only valid along a streamline. It is only valid for inviscid flow (fluid with zero viscosity). It is only valid for incompressible flow (constant density fluid).

The Bernoulli argument is somehow flawed because the velocity difference does not lead to pressure difference, it is the circulation that leads to pressure difference. Bernoulli principle always assumes no viscosity and vorticity.

Last edited:

kuruman
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Did you see this wikipedia article?
https://en.wikipedia.org/wiki/Magnus_effect
There is no mention of Bernoulli, just Newton's Third law which gives an intuitive explanation in terms of air friction.

Normally, I check wiki. this time, I did not. Thank you!