# Vacuum Initial condiction

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 March 11, 2010, 08:46 Vacuum Initial condiction #1 New Member   liang liam Join Date: Nov 2009 Location: Taiwan Posts: 28 Rep Power: 7 hello, every one i have a problem does the Initial condiction can set Vacuum ? thanks

 March 12, 2010, 01:04 #2 Senior Member   michael barkhudarov Join Date: Mar 2009 Posts: 331 Rep Power: 9 voids can be assigned pressure and temperature, but without the use of a bubble model it does not make much difference for one-fluid incompressible flow. What is the application you are using it for?

March 12, 2010, 03:07
#3
New Member

liang liam
Join Date: Nov 2009
Location: Taiwan
Posts: 28
Rep Power: 7
Quote:
 Originally Posted by MuxaB voids can be assigned pressure and temperature, but without the use of a bubble model it does not make much difference for one-fluid incompressible flow. What is the application you are using it for?

so the voids is air?
I don't know the void means,and how to use it.

i wanna use vapor started into a tube to condensation and I think the tube should not have any fluids at first. so i wanna set the tube as vacuum condiction at first.

thank you very much! you really help me many times!

 April 6, 2010, 10:20 #4 Senior Member   michael barkhudarov Join Date: Mar 2009 Posts: 331 Rep Power: 9 If you want to inject vapor into a vacuum, then a void model will not work. You will need to use the two-fluid model, with fluid #1 representing liquid phase and fluid #2 representing the vapor. The initial vacuum will have to approximated by the vapor at a low density. You can then inject vapor (fluid #2) at a mesh boundary by specifying the velocity, density and temperature at it. As it condenses it will form fluid #1, liquid that is..

April 6, 2010, 10:32
#5
New Member

liang liam
Join Date: Nov 2009
Location: Taiwan
Posts: 28
Rep Power: 7
Quote:
 Originally Posted by MuxaB If you want to inject vapor into a vacuum, then a void model will not work. You will need to use the two-fluid model, with fluid #1 representing liquid phase and fluid #2 representing the vapor. The initial vacuum will have to approximated by the vapor at a low density. You can then inject vapor (fluid #2) at a mesh boundary by specifying the velocity, density and temperature at it. As it condenses it will form fluid #1, liquid that is..

The initial vacuum will have to approximated by the vapor at a low density. I don't know that means??...

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