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why the cavitation incepts in the area of high pressure ? |
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April 23, 2014, 11:27 |
why the cavitation incepts in the area of high pressure ?
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#1 |
New Member
cuocuozhuo
Join Date: Apr 2014
Posts: 4
Rep Power: 11 |
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. http://a4.images22.51img1.com/6000/3...1b41e4eb39.jpg http://ad.images22.51img1.com/6000/3...598580dedd.jpg |
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April 24, 2014, 08:11 |
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#2 |
Senior Member
Behrooz Jamshidi
Join Date: Apr 2013
Posts: 110
Rep Power: 12 |
Hi
What is your operating pressure? and what cavitation pressure you have set on the mass tab in define>phases>interaction? Be careful that cavitation pressure is an absolute value. check your initialization pressure.Maybe your run is initialized with a lower pressure than cavitation pressure. Its better to converge your solution under non-cavitation condition, then activate cavitation. Best regards |
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April 26, 2014, 06:29 |
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#3 |
New Member
cuocuozhuo
Join Date: Apr 2014
Posts: 4
Rep Power: 11 |
Thank you for your reply. I am very appreciate that.I have resolved this problem. The result I display is a wrong calculation result.
The cavitation pressure I set is 3540 Pa, and I used the singhal-et-al model.I think it is alright. The problem is I gave a bad initialization value of Turbulent Kinetic Energy, Turbulent Dissipation Rate,and phase-2 volume fraction. After I revised them, I got the reasonable result. By the way, I am a rookie of CFD. Thank you again for your help. Best wishes. |
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