On 25 Mrz., 17:01, "Igor " <is.marke...@gmail.com> wrote: > > I doubt that a steady-state solution for your problem exists if a boundary condition depends on time. > > Or did I misunderstand something ? > > If my BC constant I can obtain the result in 300sec, but if my BC depends (just 1 BC(t) and others still constant) on time then result will be available in 3-4 hours