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Jun 6, 2014 at 12:02 vote accept jokersobak
Jun 6, 2014 at 10:39 answer added Carlo Beenakker timeline score: 3
Jun 6, 2014 at 9:36 comment added leo monsaingeon Just found a reference in my archives: look at this paper and in particular their equation (1.5). I guess the references [5,10] therein should help
Jun 6, 2014 at 9:19 comment added leo monsaingeon I'm no expert here, but I seem to remember just the opposite: if $\mathbf{n}$ is the exterior normal then you just impose zero Neumann BC where $\mathbf{v}\cdot \mathbf{n}\geq 0$, whereas you have to prescribe $a\frac{\partial u}{\partial n}+\beta(u-u_b)=F$ for given $F$ where $\mathbf{v}\cdot \mathbf{n}<0$. This makes physical sense to me: in the outflow region the boundary conditions are just self-adjusting to what comes "from the inside", but in the inflow region you have to know what comes from the outside (the PDE cannot know this information). But I have no reference, sorry...
Jun 6, 2014 at 9:10 history asked jokersobak CC BY-SA 3.0