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Hi, I'm Matthew.

You asked what the physical meaning of the slip/no-slip condition means.

You need to look up the term "Knudsen Number".

This is simply a reminder of what CFD is base upon.

This will give insight into your question.

Fluid Dynamics is mostly based on Continuim Mechanics which assumes that the properties of a gas or liquid can be approximated by some very simple rules.

These would be:
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