Help me to solve that problem, please!

swapshot · November 11, 2012, 12:47

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

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.

November 11, 2012, 12:47	Help me to solve that problem, please!	#1
swapshot New Member Võ Duy Trung Join Date: Nov 2012 Posts: 5 Rep Power: 14	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.

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November 17, 2012, 04:55		#3
swapshot New Member Võ Duy Trung Join Date: Nov 2012 Posts: 5 Rep Power: 14	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?

November 17, 2012, 15:50		#4
atmcfd Senior Member ATM Join Date: May 2009 Location: United States Posts: 104 Rep Power: 17	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.