@TechReport{	  it:2000-007,
  author	= {Lars Ferm and Per L{\"o}tstedt},
  title		= {On numerical errors in the boundary conditions of the
		  {E}uler equations},
  institution	= {Department of Information Technology, Uppsala University},
  department	= {Division of Scientific Computing},
  year		= {2000},
  number	= {2000-007},
  month		= apr,
  abstract	= {Numerical errors in solution of the Euler equations of
		  fluid flow are studied. The error equations are solved to
		  analyze the propagation of the discretization errors. In
		  particular, the errors caused by the boundary conditions
		  and their propagation are investigated. Errors generated at
		  a wall are transported differently in subsonic and
		  supersonic flow. Accuracy may be lost due to the
		  accumulation of errors along walls. This can be avoided by
		  increasing the accuracy of the boundary conditions. Large
		  errors may still arise locally at the leading edge of a
		  wing profile. There, a fine grid is the best way to reduce
		  the error. }
}