Why compare viscous flow to inviscid for external and internal flows?

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matt horman
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why is it useful to compare viscous flow to inviscid
 

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matt horman said:
why is it useful to compare viscous flow to inviscid
For external flows, inviscid flow provides a very close approximation to the solution for a viscous fluid outside the thin boundary layer at a solid surface. For internal flows, inviscid flow provides a very close approximation to the solution for a viscous fluid in the entrance region of the duct or channel, outside the wall boundary layer at the solid surfaces.
 

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