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-   -   Volume in fluent 2d (http://www.cfd-online.com/Forums/fluent/100507-volume-fluent-2d.html)

NAD April 26, 2012 08:59

Volume in fluent 2d
 
Hi.
when we use fluent 2D (2d or 2ddp), at the begining fluent display a statistics about volume and face area (minimum volume, maximum volume, total volume, minimum face area ....etc).
I want to ask: what represent the volume in this case????

LuckyTran April 27, 2012 01:52

Quote:

Originally Posted by NAD (Post 357185)
Hi.
when we use fluent 2D (2d or 2ddp), at the begining fluent display a statistics about volume and face area (minimum volume, maximum volume, total volume, minimum face area ....etc).
I want to ask: what represent the volume in this case????

these are just mesh metrics. volume would refer to cell volumes, etc.

NAD April 27, 2012 10:23


LuckyTran, thanks for your reply.
in my question I meant what represent the volume in 2D?

regards

LuckyTran April 27, 2012 11:30

Quote:

Originally Posted by NAD (Post 357488)
LuckyTran, thanks for your reply.
in my question I meant what represent the volume in 2D?

regards

When you create a 2D mesh, you're actually creating a 3D mesh with only 1 cell in the 3rd direction. Depending on the meshing tools, format, and the way the solver interprets it, the thickness of the cell in the 3rd dimension varies.

Hence, even for a 2D problem, there is still a 3D representation, with volumes and all. You can also think of it mathematically, 2D is just 3D with everything the same in one direction. It's not that a 2D problem only has 2 dimensions, just that the 3rd dimension is either ignored or treated differently.

NAD April 28, 2012 08:49

LuckyTran,Hi.
I get it.
Thanks for these clarifications and explanations.

hassansalem January 23, 2013 18:42

the volume of a 2d cell is simply the area of the cell multiplied by unit depth
so, for a cell with area A, it's volume V=A*1 m^3

hassansalem January 23, 2013 18:43

the volume of 2d cell is the area of the cell multiplied by unit depth.

manxu October 25, 2013 04:00

Quote:

Originally Posted by hassansalem (Post 403660)
the volume of 2d cell is the area of the cell multiplied by unit depth.

Hi,

When i return the value of C_VOLUME(c,t), I get zero for a 2D mesh ! So how do we know the third dimension ?

hassansalem October 25, 2013 05:36

Dear,

Fluent doesn't identify the Macro C_VOLUME(c,t) for 2-d mesh, you should instead use the cell area Macro to return the value of the cell area...then the volume of your cell will simply be the returned cell area multiplied by unit depth of 1m.

manxu October 25, 2013 07:02

Quote:

Originally Posted by hassansalem (Post 458948)
Dear,

Fluent doesn't identify the Macro C_VOLUME(c,t) for 2-d mesh, you should instead use the cell area Macro to return the value of the cell area...then the volume of your cell will simply be the returned cell area multiplied by unit depth of 1m.

I am sorry, I made a mistake while giving the cell and thread. Now, after revising, I get exactly A*1m as a return value for C_VOLUME(c,t).

Thank you, Salem.


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