Just a really quick sanity check. This equation...(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\nabla[/tex]sU = [tex]\nabla[/tex]U - n*(n [tex]\bullet[/tex] [tex]\nabla[/tex]U)

...the correct equation for the surface gradient given [tex]\nabla[/tex]U is the gradient of the surface and n is the normal unit vector?

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# The surface gradient.

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