# Volume in fluent 2d

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 April 26, 2012, 08:59 Volume in fluent 2d #1 Member   Join Date: Oct 2011 Posts: 37 Rep Power: 6 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????

April 27, 2012, 01:52
#2
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Lucky Tran
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Quote:
 Originally Posted by NAD 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.

 April 27, 2012, 10:23 #3 Member   Join Date: Oct 2011 Posts: 37 Rep Power: 6 LuckyTran, thanks for your reply. in my question I meant what represent the volume in 2D? regards

April 27, 2012, 11:30
#4
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Lucky Tran
Join Date: Apr 2011
Location: Orlando, FL USA
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Quote:
 Originally Posted by NAD 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.

 April 28, 2012, 08:49 #5 Member   Join Date: Oct 2011 Posts: 37 Rep Power: 6 LuckyTran,Hi. I get it. Thanks for these clarifications and explanations.

 January 23, 2013, 19:42 #6 New Member   hassan salem Join Date: Aug 2012 Posts: 5 Rep Power: 6 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

 January 23, 2013, 19:43 #7 New Member   hassan salem Join Date: Aug 2012 Posts: 5 Rep Power: 6 the volume of 2d cell is the area of the cell multiplied by unit depth.

October 25, 2013, 04:00
#8
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Rams Manu
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Quote:
 Originally Posted by hassansalem 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 ?

 October 25, 2013, 05:36 #9 New Member   hassan salem Join Date: Aug 2012 Posts: 5 Rep Power: 6 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.

October 25, 2013, 07:02
#10
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Rams Manu
Join Date: Oct 2013
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Quote:
 Originally Posted by hassansalem 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.

 Tags fluent 2d, volume

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