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why the cavitation incepts in the area of high pressure ?

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Old   April 23, 2014, 10:11
Question why the cavitation incepts in the area of high pressure ?
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cuocuozhuo
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I use the software FLUENT 14.5 to simulate this case.
I use liquid-vapor two phases method:I choose the k-e model, two phases mixture model and s-e-a model.
Boundary conditions are as followsressure inlet,total pressure is 101325 Pa; volume fraction of vapor is 0 at the inlet.; Pressure outlet, 0 Pa.
The result shows that the pressure in upstream area is higher than 8.8e +04. I think there shouldn't be cavitation. But the result shows that the vapor volume fraction is higher than 6.5e-03. I don't think it is reasonable.
I tried other models like schnerr-sauer model and zwart-gerber-belamri model.The results are same as this.
I think maybe you can help me. Thank you.
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