CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLOW-3D (http://www.cfd-online.com/Forums/flow-3d/)
-   -   symmetry Boundary Conditions (http://www.cfd-online.com/Forums/flow-3d/75577-symmetry-boundary-conditions.html)

club68512 April 29, 2010 05:47

symmetry Boundary Conditions
 
hello every

I have a problem about...symmetry Boundary Conditions,Dose it means no flux of any property across that boundary ?

the flux is heat? or??

thanks!

MuxaB May 2, 2010 16:14

This is correct, all fluxes into the boundary are zero, and there is no friction at it.

club68512 May 3, 2010 10:43

Quote:

Originally Posted by MuxaB (Post 257223)
This is correct, all fluxes into the boundary are zero, and there is no friction at it.

but I set the boundary as symmetry that still has fluid across.

MuxaB May 4, 2010 23:55

Is there another mesh block on the other side of that boundary? If so, then this boundary will automatically be set as an inter-block boundary, which allow for a flow through it.

If it is stays a symmetry boundary, then there is definitely no flow through it. What makes you think there is flow?

club68512 May 7, 2010 09:50

Quote:

Originally Posted by MuxaB (Post 257591)
Is there another mesh block on the other side of that boundary? If so, then this boundary will automatically be set as an inter-block boundary, which allow for a flow through it.

If it is stays a symmetry boundary, then there is definitely no flow through it. What makes you think there is flow?


thanks!! now I see.

I set another mesh block on the side!

club68512 September 29, 2010 03:59

I have some problems...

as you say... Is there another mesh block on the other side of that boundary? If so, then this boundary will automatically be set as an inter-block boundary, which allow for a flow through it. do you mean any boundary on the other side ? even P or Wall ?

How do you know about that? I can't find any
documents to prove that .


sorry about my poor English~

stefmascio September 29, 2010 09:47

yes, whatever you set, if two boundaries are connected, the connected boundaries are automatically switched to a special type called "inter-block" as soon as you run the simulation.

This happens for linked blocks and for nested blocks too. In this second case, clearly, only the boundaries of the inner block will be converted to the inter-block type.
If you have two linked blocks, not of the same dimensions, the part of the boundary not connected to the other block will automatically become a wall.

hhh August 30, 2012 09:05

boundary condition (symmetry vs periodic doubt)
 
Dear friends,
i am doing 3D wing analysis, i have doubt on boundary conditions in fluent ie both symmetry and periodic, anybody have the answer please let me know briefly,for what kind of purpose to use symmetry & periodic boundary conditions, please tell any example with problem.


All times are GMT -4. The time now is 08:06.