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-   -   [Domain]Three different Domain (http://www.cfd-online.com/Forums/cfx/25735-domain-three-different-domain.html)

Young April 26, 2008 23:17

[Domain]Three different Domain
 
Dear My Colleagues

I have tired to make a radiant floor model.

But I'm in trouble.

As you know, there are three different domain types

__________________________________

Room " Fluid Domain (Ideal Gas)

__________________________________

Slab " Solid Domain (concrete)

_______________________________

Tube " Fluid Domain (water)

----------------------------------

When I make room a fluid domain with idea gas, the fluid property of the tube domain (which was assigned with water) is changed automatically as water.

How do I separate the domain between room and tube?

Thanks your attentions


Young April 26, 2008 23:44

editied : [Domain]Three different Domain
 
Dear My Colleagues

I have tired to make a radiant floor model.

But I'm in trouble.

As you know, there are three different domain types

__________________________________

Room " Fluid Domain (Ideal Gas)

__________________________________

Slab " Solid Domain (concrete)

_______________________________

Tube " Fluid Domain (water)

----------------------------------

When I make room a fluid domain with idea gas, the fluid property of the tube domain (which was assigned with water) is changed automatically by Idea gas as room domain.

Moreover, tube domain is automatically assigned bouyancy and radiation input as room domain.

How do I separate the domain between room and tube?

Thanks your attentions


andy2o April 27, 2008 13:49

Re: editied : [Domain]Three different Domain
 
This caused me problems once in the past, but is very easy to fix. Look up "Constant domain physics in the CFX help". A short quote from the documentation describing what to do is below:

"By default, CFX-Pre always enforces the physics between fluid domains to be consistent. However, for some classifications of problem it is viable to define different physics in different dis-connected fluid domains. In order to de-activate the enforcement of constant domain physics, select Edit > Options > CFX-Pre > Enable Beta Features and a new action becomes available in the right-click menu on the 'Simulation' branch of the tree. The 'Constant Domain Physics' action can then be de-selected if required."

There is another method to do the same thing which doesn't use beta options. It uses an environment variable to tell CFX to allow different fluids. Search for it in the help system...

Regards, andy

Young April 27, 2008 14:11

Re: editied : [Domain]Three different Domain
 
Hi Andy,

Thank for your help...

I can fix the problem with your comments.

I appreciate you.

Best Regards,

Young


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