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X- momentum divergence in 2D axisymmetric model

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Old   January 29, 2015, 10:53
Default X- momentum divergence in 2D axisymmetric model
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Harold Jankowski
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Hey to all experts out there,
I'm simulating an axisymmetric 2D-model for a rotary kiln. The 3D-model has worked properly, however in order to reduce the calculation effort I want to also build a 2D-model.
I have defined it as an axisymmetric model in fluent and have also built my model on the XY-plane along the x-axis, which is the standard symmetry-axis if I got that right.

Here comes my problem:
Whenever I start the simulation I get the following message after one Iteration:

Error: Divergence detected in AMG solver: x-momentum
Error Object: #f

I have already done some Internet research, but nothing so far could fix my problem.

Thanks to everyone who can contribute to this problem,
hjan
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Old   January 30, 2015, 10:36
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Cees Haringa
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I'm not sure if this may cause a divergence error, but is your symmetry axis exactly on the x-axis? if it is off by just a little bit, axisymmetric calculation will give an error. I'm just not sure at what point.
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Old   January 30, 2015, 17:11
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Harold Jankowski
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Thanks for the reply, first of all.

I checked my mesh and it said my geometry starts exactly at y=0.
I also built another geometry, and had the same problem again, so I guess that was not the problem :/
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