Initial Condition

mojtabaivi · June 6, 2015, 08:30

Hi everybody;
I want to simulate a free surface flow (transient) in CFX.
I have to set fluid elevation as Initial Condition.
The model is a reservoir that has an initial volume of water. The elevation of water surface is 2 meters. I really need your help.
What should I do?

Thanks, Mojtaba

ghorrocks · June 6, 2015, 23:31

Have you tried the CFX tutorials? The free surface flow over a bump tutorial looks relevant here.

mojtabaivi · June 7, 2015, 03:01

Quote:

Originally Posted by ghorrocks

Have you tried the CFX tutorials? The free surface flow over a bump tutorial looks relevant here.

Yes I did it, but my problem has not solved yet!

My question is about fluid elevation in initial condition, but it isn't mentioned in the tutorial.

ghorrocks · June 7, 2015, 03:18

You can set initial conditions with simple commands like setting the initial liquid volume fraction to:

step((2[m]-y)/1[m])

and the gas volume fraction to automatic.

June 6, 2015, 08:30	Initial Condition	#1
mojtabaivi New Member Mojtaba Ans Join Date: Mar 2015 Posts: 14 Rep Power: 12	Hi everybody; I want to simulate a free surface flow (transient) in CFX. I have to set fluid elevation as Initial Condition. The model is a reservoir that has an initial volume of water. The elevation of water surface is 2 meters. I really need your help. What should I do? Thanks, Mojtaba

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June 6, 2015, 23:31		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,001 Rep Power: 146	Have you tried the CFX tutorials? The free surface flow over a bump tutorial looks relevant here.

June 7, 2015, 03:18		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,001 Rep Power: 146	You can set initial conditions with simple commands like setting the initial liquid volume fraction to: step((2[m]-y)/1[m]) and the gas volume fraction to automatic.