CFD Online Discussion Forums

CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)
-   CFX (https://www.cfd-online.com/Forums/cfx/)
-   -   interface doubt (https://www.cfd-online.com/Forums/cfx/123170-interface-doubt.html)

shaswat September 5, 2013 22:35
interface doubt
 
Dear all,

I have a doubt in the domain interface tab (fluid-porous), I found the following option. interface model>option >pressure change
What is exact meaning of it?
for example, I just put the default value of 70 mmHg.

Can you please explain the theory of it?

I set fluid domain initialization as 89 mm Hg .


is it correct the porous domain pressure is 19 mm Hg? if this is correct , we can put the porous domain pressure initialization as 19 mmHg instead.


Thank you

brunoc September 6, 2013 10:34
With the tab 'Addition Interface Models' opened, hit F1 on your keyboard.

Quote:
Pressure Change
Enter a numerical quantity or CEL expression that specifies the pressure change across the interface (from side 1 to side 2). If there is a pressure drop, the specified value should be negative.
This is a pressure jump you specify across the interface. So if side1 has a pressure of 89 mm Hg and the jump is set to 70 mm Hg, side2 should have pressure of 159 mm Hg.

This should be used to model local pressure losses (a screen, for example) or to fix the pressure loss on a periodic translational domain, not to model the pressure loss across a porous domain. For that you should use the porous domain loss model.

Cheers.

shaswat September 7, 2013 01:35
Quote:
Originally Posted by brunoc (Post 450232)
With the tab 'Addition Interface Models' opened, hit F1 on your keyboard.



This is a pressure jump you specify across the interface. So if side1 has a pressure of 89 mm Hg and the jump is set to 70 mm Hg, side2 should have pressure of 159 mm Hg.

This should be used to model local pressure losses (a screen, for example) or to fix the pressure loss on a periodic translational domain, not to model the pressure loss across a porous domain. For that you should use the porous domain loss model.

Cheers.
It is very useful information and clear
Thank you so much.
Regards.


All times are GMT -4. The time now is 23:45.