# energy source term for 2d axisymmetric

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 December 27, 2022, 08:11 energy source term for 2d axisymmetric #1 New Member   arash Join Date: Aug 2009 Posts: 29 Rep Power: 16 Hi, I want to add energy source term in 2d axisymmetric problem. dimension of energy source term is W/m3. I completely confused how can I convert 200 W heat, to this 2d axisymmetric problem? I 3d I have no problem:

December 27, 2022, 12:23
#2
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Kareem
Join Date: Nov 2022
Location: New York
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Quote:
 Originally Posted by a.maroofi Hi, I want to add energy source term in 2d axisymmetric problem. dimension of energy source term is W/m3. I completely confused how can I convert 200 W heat, to this 2d axisymmetric problem? I 3d I have no problem:
A axisymmetric cell zone has volume which can be calculated as the revolution of the 2D face around the x-axis. The easiest way to define your source term is to use an expression:

200 [W]/Volume(['your_cell_zone'])

This will calculate the volume of the revolved domain and divide your input accordingly to get your source term in W/m^3.
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December 28, 2022, 01:26
#3
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arash
Join Date: Aug 2009
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Quote:
 Originally Posted by CFDKareem A axisymmetric cell zone has volume which can be calculated as the revolution of the 2D face around the x-axis. The easiest way to define your source term is to use an expression: 200 [W]/Volume(['your_cell_zone']) This will calculate the volume of the revolved domain and divide your input accordingly to get your source term in W/m^3.
Dear CFDKareem,
Please describe it for me with one example.We assume that a tube with radius 2cm and 5cm length. what is energy source term for 2d axisymmetric of this case?
200 W/(VOLUME???)
How can I calculate volume?

 December 28, 2022, 01:34 #4 Senior Member   Alexander Join Date: Apr 2013 Posts: 2,309 Rep Power: 33 google for "expressions in ansys fluent" a.maroofi likes this. __________________ best regards ****************************** press LIKE if this message was helpful

December 28, 2022, 09:29
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Kareem
Join Date: Nov 2022
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Quote:
 Originally Posted by a.maroofi Dear CFDKareem, Please describe it for me with one example.We assume that a tube with radius 2cm and 5cm length. what is energy source term for 2d axisymmetric of this case? 200 W/(VOLUME???) How can I calculate volume?
1) Select Source Term and add 1 term
2) Select expression for the source and hit the "F(x)" icon
3) Type in "200[W]/" and then add Function>Reduction>Volume
4) Replace <location> with the name of the cell zone you would like to add the energy to.

See pictures for further detail and check the Fluent guide on using expressions, as Alexander mentioned.
Attached Images
 ExpressionSource.png (64.9 KB, 6 views) ExpressionSource2.png (62.0 KB, 7 views)
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 Tags 2d axisymmetric, energy, source terms