> On Feb 11, 2011, at 1:07 PM, Julien Derr wrote: > > > I din't express myself well ; I was meaning, is it possible to impose > that the resulting gradient would be normal to the side ? > > The vector boundary conditions are always normal to the side. > > > Hi, I don't really understand, the gradient of the concentration field is not necessarly normal to the side ? or is it ? a priori the direction of grad(c) can be different than the normal, no ?
is there a way to impose this condition, or is this condition imposed by default ? Julien
