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Nozzle - Simulation converges, but data incorrect

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Old   July 20, 2009, 04:13
Default Nozzle - Simulation converges, but data incorrect
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I'm running a simulation on a laval converging-diverging nozzle, and while the answer is converging, the values are lower than what Fluent gave (a program I don't currently have access to, which is why I am using CFX, which I am less familiar with), or what experiments show. The problem is set using the energy equation, with a pressure inlet and supersonic outlet. The residuals are good, and the flow profile makes sense, but the velocities are about 20% low.
Because of the high pressure (~40 atm), I started with lower pressures and a subsonic outlet, and built up the speed slowly. In searching results, most people seem to have trouble with convergence, which I did not, but if anyone has any idea why the values are unusual, they would be much appreciated.

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