# Calculation of the Inlet Area in Axisymmetric 2D Simulation

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December 22, 2022, 06:04
Calculation of the Inlet Area in Axisymmetric 2D Simulation
#1
New Member

Felix Leh
Join Date: Oct 2021
Posts: 4
Rep Power: 4
Hi guys,

i am wondering how fluent calculates the surface area of a inlet surface in a 2d axisymmetric simulation.
I try to simulate the flow of two gases (air and methane) through a combustor in a combustion chamber. A drawing of the geometry is attached.
In my opinion the real surface area of "Inlet 1" is S1 = pi*R1^2 = 28.27 mm2 since the line of "Inlet 1" with the length of R1 leads to a circular surface. BUT Fluent says the surface area of "Inlet 1" is 405.27mm2 (im reporting the surface area of "inlet 1" in the calculation.
The real surface area of "Inlet 2" should be S2 = pi*R3^2 - pi*R2^2 = 480.66mm2 since this is a annular surface. But Fluent says the surface area is 1611,6 mm2...

Does anybody know how fluent calculates these surface areas?
Attached Images
 Geometry.png (23.9 KB, 23 views)

December 23, 2022, 11:39
#2
Senior Member

Kareem
Join Date: Nov 2022
Location: New York
Posts: 115
Rep Power: 3
If the domain is setup correctly, the area should be correct (see picture).

For axisymmetric models the axis of revolution is the X-axis, not the edge you defined as "axis". Make sure your domain is located directly on the X-axis.

From the numbers you are getting it looks like the axis defined is off the X-axis.
Attached Images
 Axis_Area.jpg (96.3 KB, 22 views)
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 December 27, 2022, 05:52 #3 New Member   Felix Leh Join Date: Oct 2021 Posts: 4 Rep Power: 4 Hi, thank you for your answer. My Problem was that my "axis" was NOT located at the x-axis. CFDKareem likes this.

 Tags axisymmetric 2d fluent

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