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wwwuxing December 23, 2010 22:12

Cavitation and air admission
 
Hi, everyone, I have simulation the cavitation in the control valve, and I found the severe cavitation in the valve. But that is the problem, I want to solve the problem, and the best way maybe is air admission as everyone knows. However, the flow flux of the air admission is hard to fixed, so I want to solve it by the CFX.

My plan is add an air pipe in to the valve that is for air admission, according to the experience I should set the pipe as outlet, but any other conditions I should set? and how to set? does anyone knows?


best wishes

XING W

ghorrocks December 24, 2010 05:22

If the air pipe is to release air then it is an inlet.

You will have to consider what form the air enters the flow in. Is it in big bubbles or as a large number of tiny bubbles? I assume it is as tiny bubbles. In this case they are likely to significantly affect the cavitation nucleation and collapse mechanism which means you will need to adjust the cavitation model to account for this.

wwwuxing December 24, 2010 07:45

Quote:

Originally Posted by ghorrocks (Post 288367)
If the air pipe is to release air then it is an inlet.

You will have to consider what form the air enters the flow in. Is it in big bubbles or as a large number of tiny bubbles? I assume it is as tiny bubbles. In this case they are likely to significantly affect the cavitation nucleation and collapse mechanism which means you will need to adjust the cavitation model to account for this.

thanks for your answer. ok, i will study their differences in CFX, thank you.


merry chrismas!


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