multiphase volume fraction defintion

daniebae · November 9, 2010, 10:24

Dear all,

i am doing a transient simulation. A solid is pressing in a fluid. the Fluid contains water and air. How can i define in CFX which part of the domain contains water or air ? there is no outlet and inlet.

thanks for an answer.

daniel

ghorrocks · November 9, 2010, 16:40

The CFX tutorials show the various ways water and air can be specified. The 2D flow over a bump one shows the free surface approach, the bubble column one shows the eularian approach.

100tinela · November 18, 2010, 12:01

Quote:

Originally Posted by ghorrocks

The CFX tutorials show the various ways water and air can be specified. The 2D flow over a bump one shows the free surface approach, the bubble column one shows the eularian approach.

Like ghorrocks said, the tutorial "Flow over a bump" show how you can define it. You basically define these fluids in your domain settings and create a expression using step function to define two different volume fractions.

You also can find more information in CFX manual looking for "free surface".

Good luck,
Willian

vishal.indomitable · September 2, 2011, 05:01

Specify the working fluids as Water and air. That may solve your problem.

November 9, 2010, 10:24	multiphase volume fraction defintion	#1
daniebae New Member Daniel Baeriswyl Join Date: Oct 2009 Posts: 9 Rep Power: 16	Dear all, i am doing a transient simulation. A solid is pressing in a fluid. the Fluid contains water and air. How can i define in CFX which part of the domain contains water or air ? there is no outlet and inlet. thanks for an answer. daniel

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November 9, 2010, 16:40		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	The CFX tutorials show the various ways water and air can be specified. The 2D flow over a bump one shows the free surface approach, the bubble column one shows the eularian approach.

September 2, 2011, 05:01		#4
vishal.indomitable New Member Vishal Join Date: Feb 2011 Location: Bhopal, M.P. (India) Posts: 18 Rep Power: 15	Specify the working fluids as Water and air. That may solve your problem.