free surface flow

songsh0227 · April 14, 2015, 02:35

hi i want to freesurface simulation.

attach boundary condition

inlet Q : 111,000 kg/s massflow

outlet : free discharge

i know inlet boundary condition

but i don't know how enter outlet boundary condition

CFX tutorial Free Surface Flow Over a Bump,

outlet boundary condition : static pressure

relative pressure : DownPres

but in my simulation i don't know DownH

i want to free discharge

how did i ??

ghorrocks · April 15, 2015, 06:56

First of all - this simulation really needs to be split up into the inlet section, the long pipe and the outlet section. Modelling it all together is going to be very challenging.

What is the outlet condition in the real device? That is what should guide your boundary condition choice.

songsh0227 · April 15, 2015, 22:21

thank you for your answer.

real device is rainwater storage

also free discharge

i perform many boundry condition, like static pressure outlet, opening and entrainment. but i didn't know what boundary condition right....

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April 15, 2015, 06:56		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	First of all - this simulation really needs to be split up into the inlet section, the long pipe and the outlet section. Modelling it all together is going to be very challenging. What is the outlet condition in the real device? That is what should guide your boundary condition choice.

April 15, 2015, 22:21		#3
songsh0227 New Member song sooho Join Date: Sep 2014 Posts: 9 Rep Power: 12	thank you for your answer. real device is rainwater storage also free discharge i perform many boundry condition, like static pressure outlet, opening and entrainment. but i didn't know what boundary condition right....