What is the difference between Flow and Boundary Separation?

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SUMMARY

The discussion centers on the distinction between Flow Separation and Boundary Layer Separation as described in Paul K. Chang's book "Separation of Flow." The participant argues that the Wikipedia definition is misleading and asserts that both terms refer to the same phenomenon, emphasizing that flow separation is fundamentally linked to viscosity. The participant critiques the Wikipedia explanation, particularly the statement regarding the boundary layer speed, labeling it as nonsensical.

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JTC
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Could someone please go here...

https://en.wikipedia.org/wiki/Flow_separation

And explain to me the difference between Flow and Boundary Separation discussed in the opening.

Because this explanation makes no sense to me. I have the problem. I just don't understand the difference.
 
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I don’t think that there is a difference. In Paul K. Chang’s book "Separation of Flow“ one reads in chapter I: "The classical concept of flow separation is because of viscosity; therefore, it is often expressed as boundary layer flow separation or boundary layer separation.“
 
Boy that Wikipedia intro is a mess. There's no difference, and their description of what it is ("speed of the boundary layer relative to the object falls almost to zero") is utter nonsense.
 
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