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On Nov 22, 2010, at 7:52 PM, John Denker wrote:
On 11/21/2010 06:22 PM, John Mallinckrodt wrote:Indeed, that is an instance of what I called a "boring" steady flow.
/snip/ except in boring
cases, steady flows are only steady in *one* reference frame.
/snip/ two semi-infinite airmasses, one to the left of the XZ plane
and one to the right. They are sliding past each other. This
is a steady flow.
-- In some frame, airmass A is moving in the +X direction while
airmass B is moving in the -X direction.
-- In another frame, airmass A is moving while airmass B is
stationary.
-- In yet another frame, airmass A is stationary while airmass
B is moving.
So, in accordance with Bernoulli's principle, which airmass has
the lower pressure?