June 18, 2019 at 7:48 amMrFCASubscriber
June 18, 2019 at 8:31 amDrAmineAnsys Employee
1/Bad convergence behavior
2/Negative Absolute Pressure might tell that water is cavitating inside the Pump.
June 19, 2019 at 7:50 amMrFCASubscriber
Hello! The first problem was solved (it was due to the boudary conditions). However, the second problem not. Why is it cavitating in this stranger zone? I have followed the step of two videos upload in YouTube (ANSYS How To Videos). This are the links followed:
June 19, 2019 at 7:55 amMrFCASubscriber
Do not you have manuals on centrifugal pumps to follow the steps and solve the problem correctly?
June 19, 2019 at 8:08 amDrAmineAnsys Employee
No I do not have the manuals for that. The videos are sufficient.
Which 2nd Problem are you now meaning? The negative Aboslute pressure?
June 19, 2019 at 8:12 amMrFCASubscriber
Yes, I refer to the negative absolute pressure. How can I solve that?
June 19, 2019 at 8:14 amMrFCASubscriber
I have been traying a lot of things, but in this zone of the blade I always have this problem. I hace tried with different geometries and it always happens.
June 19, 2019 at 8:16 amDrAmineAnsys Employee
If all settings are correct and convergence is now excellent, then as I said it probably seems cavitating.
June 19, 2019 at 8:16 am
June 19, 2019 at 8:19 amMrFCASubscriber
But in real life, negative absolute pressures are not possible. Why the program give me this result?
June 19, 2019 at 8:31 amDrAmineAnsys Employee
That is why one requires modeling cavitation to avoid negative absolute pressure. Absolute Pressure is only limited for material properties.
June 19, 2019 at 8:32 amDrAmineAnsys Employee
Make some more tutorials especially one related to cavitation.
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