documentation: 10.1.1.4 Outflow boundary conditions unclear
section 10.1.1.4 Outflow boundary conditions is unclear
Note that in the moving body work of Bao et al. [4] some care must be made to identify when the flow over the boundary is incoming or outgoing and so a modification of the term
This doesn't explain clear enough what the difference how inflow and outflow should change the parameters.