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July 27, 2006, 02:56 |
Hi everybody,
I am experienci
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New Member
Michael Oevermann
Join Date: Mar 2009
Posts: 15
Rep Power: 17 |
Hi everybody,
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) x U_x 0 1.00176 0.111111 1.00848 0.222222 1.035 0.333333 1.06522 0.444444 1.0575 0.555556 1.04222 0.666667 1.0397 0.777778 1.03272 1 1.0012 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 Michael |
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