# What depth does fluent use in 2D problems?

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 December 12, 2009, 10:01 What depth does fluent use in 2D problems? #1 Member   thanos Join Date: Oct 2009 Posts: 30 Rep Power: 16 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. Thank you in advance!

 December 14, 2009, 04:05 #2 Senior Member   Max Join Date: Mar 2009 Posts: 133 Rep Power: 17 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

 December 14, 2009, 04:14 #3 Member   thanos Join Date: Oct 2009 Posts: 30 Rep Power: 16 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

 January 11, 2010, 03:24 #4 Senior Member     YH Tan Join Date: Mar 2009 Location: Malaysia Posts: 119 Rep Power: 17 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. __________________ Herntan, Add Reputation if I am right