Specifying diverted discharge

niko35 · May 17, 2021, 06:09

Hi Dear Flow3D users,

I have a linked open channel system (one main and one diversion channel) and I need to specify diversion discharge (as if there is a pump at the outlet). I tried to specify an outflow discharge but there is no such option. How can I do this? Does a negative volume flow rate at outflow work?

Thank you for your help.

Flow Science Australasia · May 17, 2021, 19:08

Hi niko35,

I think there are a few options for what you describe.

1) You can use a volume flow rate boundary type with the flow direction vector specified in the direction that pulls it out of the domain.

2) You could also apply a mass momentum source near your boundary that would act as a sink and draw flow from the model.

Good luck. Let me know if you have trouble getting it to work.

May 17, 2021, 06:09	Specifying diverted discharge	#1
niko35 New Member timothy Join Date: May 2021 Posts: 1 Rep Power: 0	Hi Dear Flow3D users, I have a linked open channel system (one main and one diversion channel) and I need to specify diversion discharge (as if there is a pump at the outlet). I tried to specify an outflow discharge but there is no such option. How can I do this? Does a negative volume flow rate at outflow work? Thank you for your help.

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May 17, 2021, 19:08		#2
Flow Science Australasia New Member Eric Lemont Join Date: Aug 2020 Location: Brisbane, Australia Posts: 25 Rep Power: 6	Hi niko35, I think there are a few options for what you describe. 1) You can use a volume flow rate boundary type with the flow direction vector specified in the direction that pulls it out of the domain. 2) You could also apply a mass momentum source near your boundary that would act as a sink and draw flow from the model. Good luck. Let me know if you have trouble getting it to work.