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derivative for 2D axisymetric model

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Old   April 3, 2012, 08:46
Question derivative for 2D axisymetric model
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Hi,

I'm trying to write a UDF which use derivative in a 2D axisymetrical model.

I wonder if there is a command like "C_DUDX" for Radial an Axial velocity which get back that velocities for the concerning cell.

Thanks for your answer !!
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Old   April 3, 2012, 10:06
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Maybe it's the same thing and Fluent know that when I write C_DUDX, I want the axial-velocity derivative for x (the axial variable).

What do you think ?
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Old   April 5, 2012, 12:33
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I don't have any answer from users

My udf doesn't give an error message, but I don't have what I want as result from the post process. So there is a problem and I wonder if it's from the command C_DUDX used to take the axial velocity derivative for x.

Can someone help me to know how can I make a variable with the name "new_velocity" as the axial-velocity for example?
The idea is to compare my new variable(make with the command C_U) with the real axial velocity?

Thanks !!
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