enclosed circulating flow

keeper · April 10, 2014, 04:50

Hello all.

I have a question about simulating water flow inside enclosed system. The water goes from the tank through the pipes and goes back.

But I don't know how to set up BCs for inlet/outlet. Where to put them to have fluent circulating flow?

Thank you for your suggestions.

Regards

ghorrocks · April 10, 2014, 06:29

Try the fluent forum. This is the CFX forum.

But your question does not seem to be specific to a CFD solver. Your question would apply just as well to any CFD solver.

You have to think of the real system. The flow will not move unless something moves it. Is there a pump? Is an area heated? Is there inertia left over from previous flow? In all these cases you simply model the thing which is making the flow move. You would model all of these situations differently.

keeper · April 10, 2014, 06:55

Sorry ghorrocks I meant to make the flow fluetly going

yes there is a pump. So I just have to move with the pump and I don't have to specify any in/out BC?

thank you for your answer.

ghorrocks · April 10, 2014, 07:11

If there is a pump then model the pump. I presume you do not want to model the detail of the pump - so generally that means use a momentum source term to move the flow, with the source term set up to provide the same power to the fluid as the pump does.

Have a look in the documentation for how to set up source terms.

keeper · April 10, 2014, 07:19

yes you are right I don't want to model it. perfect, thanks a lot

April 10, 2014, 04:50	enclosed circulating flow	#1
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	Hello all. I have a question about simulating water flow inside enclosed system. The water goes from the tank through the pipes and goes back. But I don't know how to set up BCs for inlet/outlet. Where to put them to have fluent circulating flow? Thank you for your suggestions. Regards

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April 10, 2014, 06:29		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Try the fluent forum. This is the CFX forum. But your question does not seem to be specific to a CFD solver. Your question would apply just as well to any CFD solver. You have to think of the real system. The flow will not move unless something moves it. Is there a pump? Is an area heated? Is there inertia left over from previous flow? In all these cases you simply model the thing which is making the flow move. You would model all of these situations differently.

April 10, 2014, 06:55		#3
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	Sorry ghorrocks I meant to make the flow fluetly going yes there is a pump. So I just have to move with the pump and I don't have to specify any in/out BC? thank you for your answer.

April 10, 2014, 07:11		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	If there is a pump then model the pump. I presume you do not want to model the detail of the pump - so generally that means use a momentum source term to move the flow, with the source term set up to provide the same power to the fluid as the pump does. Have a look in the documentation for how to set up source terms.

April 10, 2014, 07:19		#5
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	yes you are right I don't want to model it. perfect, thanks a lot