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\begin{document}

Invisid flow about a blunt object involves limiting to 0 viscosity.
There should be 0 drag according to the theory, but there is significant
drag. There is a boundary layer. 

The boundary layer tends to seperate from the object when the cross
section of the object decreases. In order to avoid momentum loss by
the object it is desirable to keep the boundary layer next to the
object as long as possible. Methods:

\begin{itemize}

\item streamlining

\item inducing turbulence

\item drag crises

\end{itemize}

\end{document}
