(adsbygoogle = window.adsbygoogle || []).push({}); What is a "lifting function"?

Hi,

I was reading a journal article and they mentioned something called a "lifting function". It was apparently used with the Navier-Stokes equation to translate the boundary conditions (which were complicated, and NOT non-slip), into a body force.

It looks like think technique could be useful, so I wanted to find out what it was. The problem is that they reference given in the article was some lecture series from the 1950s, which I can't get a hold of.

So, could anyone here explain what a lifting function is, or hopefully point me to a good explanation?

(I notice that there is something called a lifting function used in topology, but I assume it's unrelated.)

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# What is a lifting function ?

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