Hi everybody, I am experienci
I am experiencing some strange behaviour with inflow BC'c. I computing the simplest case of an inviscid straight chanal of length 1m with inflow velocity 1m/s (10x1x1 grid pints). Outflow boundary condition is zero gradient for U and p=0, slip condition along walls for U, and zero gradient for p at the inlet. The solution should be constant U=1 everywhere! Solver is essentially turbFoam with turbulence switched off. The solution looks like this (obtained with the sample programm)
But that means I have a mass error of 6.5% at x=0.333. The runtime output tells me, however, a
continuity error of
sum local = 2.86984e-43, global = 2.86984e-43, cumulative = -1.12757e-16
which is very fine!
Is there an explanation for the velocity profile?
Thanks for any hints and help
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