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swapshot November 11, 2012 12:47

Help me to solve that problem, please!
 
Dear all,

When i do my work which concern CFD, i met a problem. I want to simulate behavior of flow into pipe when the pipe is impacted by pressure of environmen at place that is defineted.
First i used CFD to perform it to flow into pipe and the pipe has no pressure impact.

So if i want to do my work, what i have to do? Somebody here can help me to solve that, thanks you very much.

atmcfd November 17, 2012 00:56

Quote:

Originally Posted by swapshot (Post 391506)
First i used CFD to perform it to flow into pipe and the pipe has no pressure impact.

Do you mean that there is no "pressure gradient" ?

swapshot November 17, 2012 04:55

Ofcourse, the pipe has no force by pressure, so in CFD i can simulate flow into the pipe. But i want to simulate flow into the pipe with a pressure which force to face on the pipe. In my mind, i design this model and mesh it by CFD, i'll connect it to solve by static to get strain. Then, i contineu to do with CFD, how do you think my way? Is it wrong or right, can u comment ur ideal?

atmcfd November 17, 2012 15:50

I dont clearly understand what you mean here, but if you are interested in simulating flow inside the pipe, you should specify appropriate boundary conditions.
In this case, you need pressure gradient to be specified. So, your pressure at the outlet of the pipe should be lesser than the inlet, so that a positive pressure gradient develops for the fluid to flow.
Otherwise you can give a velocity inlet and an outflow boundary condition.What CFD package are you using? Flow through a pipe is a fairly common test case..most commercial CFD software should have documentation on it.


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