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-   -   What depth does fluent use in 2D problems? (https://www.cfd-online.com/Forums/fluent/71024-what-depth-does-fluent-use-2d-problems.html)

 thanos December 12, 2009 11:01

What depth does fluent use in 2D problems?

Hello engineers,
I try to simulate the flow in a duct. As inlet boundary condition i choose the velocity inlet and as outlet the outflow. When i take the solution the mass flow result differs from this that i calculate with my pencil. I found out that in 2D problems fluent in order to calculate the mass flow rate regards the 2D geometry as a plate 1m deep. However, i want to have a cylindrical duct simulated and not a quadrangular one!
What can i do to change this option? I have not find a solution to this yet.

 coglione December 14, 2009 05:05

Hi Thanos,

for axisymmetric problems ( i guess your pipe is so) use the axi-symmetrical solver in Fluent. Using the cartesian 2-D solver will give incorrect results independant of the depth defined.

cheers

 thanos December 14, 2009 05:14

Hello coglione!

Actually, my problem is not axisymetric. It is a T-junction of two ducts. is there any option to help me or i have to run a 3-D simulation for sure?

With respect

 herntan January 11, 2010 04:24

Thanos,

I think u need to run it 3D.
2D simulation will give u the depth of 1 unit of the unit u use. If u use meter, u get 1 meter depth. even worst is, its not representing round.

I guess doing 3D won't take u alot of time. unless ur flow is very complex.

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