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Convergance and assymetry issues

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Old   November 4, 2004, 19:58
Default Convergance and assymetry issues
Amit Dhingra
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The model is a very thin(1mm) laminated struture of glass and silicon. On the interface between the glass and silicon, a platinum heater is placed. The problems are as follows

1. On solving, the energy resildual remains constant for an under-relaxation factor of less than one, i.e it dsnt solve at all. The sytem blows up for a factor of 1. So I 'kickstart' the system with 5 iterations at factor 1 and then solve at 0.98 which seems to work.

2. On changing the heating value and restartting from a previous solution, the sytem does not want to change. I have to re-initialize and go over step 1 to get a solution.

3. The solution given is an asymmetrical solution contrary to expectation. I am not reducing the model right now because of symmetry since I will be adding a flow channel which will break the symmetry.

Note: The elements in my model are very thin. 1x1x0.05mm

Thanks in advance. Amit.
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