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oscillation of energy equation in steady state heat transfer

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Old   June 30, 2020, 11:36
Default oscillation of energy equation in steady state heat transfer
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mohammadreza
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hi everybody
I have a problem with my simulation and I hope that there is some person that can help me.
before everything I truly apologize for my lack of skill in writing English well.
I'm simulating the heat transfer and material flow in FSW welding by using a UDF.
in UDF the coordinate system defined how I should put the center of the tool in them. but when I start to simulate the energy equation starts to oscillating in the wrong rang. (0k to 5000k) that the fluent put this limit by default. but in this way when I take contour the shape of the contour is right and it's like the reality.
in another way when I put the coordinate system at the first of the workpiece the energy equation has a normal act to convergence and the rang of temperature is right. but when I take the contour its wrong.

I want to ask is there anybody to know why this happens and what should I do?
for your know, my work is steady-state, pressure-based, simple method simulation.
I send my pictures and my UDF in case if anyone wants to see.
Attached Images
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File Type: jpg photo_2020-06-30_20-00-30.jpg (121.2 KB, 1 views)
File Type: jpg photo_2020-06-30_20-00-20.jpg (110.8 KB, 1 views)
File Type: jpg photo_2020-06-30_20-00-17.jpg (121.9 KB, 1 views)
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File Type: c UDF_970321.c (4.8 KB, 0 views)
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