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Turbulent kinetic energy for accelerating fluid (nozzle)

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Old   September 24, 2013, 08:17
Default Turbulent kinetic energy for accelerating fluid (nozzle)
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hekseli
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Hey!

Assuming a high pressure chamber with a converging or converging-diverging nozzle, the fluid is accelerating on its way out. While determining the turbulence boundary conditions for the nozzle inlet, a question arises which mean velocity should be used in kinetic energy equation k=(3/2)(UI)^2. Intensity is probably low, around 1%?

Personally I guess after some simple simulations that mean velocity between inlet and throat could be appropriate. (v_throat - v_inlet)/2.
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Old   September 30, 2013, 08:26
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It is also interesting to calculate the parameter values with the initial velocity in a chamber, which is really really slow compared to the throat velocities. Pressure and velocity field results do not change so much but of course turbulence quantities change drastically...

Any ideas?
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