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Energy Divergence

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Old   April 16, 2018, 16:32
Default Energy Divergence
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Andrew M
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So I have been having a repeating issue with my simulations for some months now and was hoping someone might have some insight.
I am trying to simulate a half model of simple Integrated Power Module (IPM) system wich consists of SiC MOSFETs (Heat sources) mounted to a direct bonded copper board (DBC) all mounted to a finned heat sink with rectangular liquid channels (Moving Fluid). The corresponding geometry can be seen in the 'Geometry.jpg'

However when I try to run this fairly simple multi physics simulation, my energy residuals continually diverge and I am hit with the errors: 'Divergence detected in AMG for Temperature' and 'Temperature limited to 5.00000+03 in cells on zone __ in domain 1'. Some of my Residual graphs are also presented below.

From past debugging I am fairly certain that this issue is rooted in my meshing somehow. I am using fairly straight forward Boundary Conditions (mass flow inlet, pressure outlet, wall-heat flux in) and have designed the entire system in DM.

As I am working with/evaluating the heat spreading throughout small scale electronics, my model consists of some very thin layers of materials for solder/ceramic substrates (i.e. 0.08mm - 0.25mm) and I believe it is very possible that the meshing is somehow having a hard time managing this, but either way I am completely stumped and have been stuck on this for some time now.

Any thoughts or advice would be much appriciated
Attached Images
File Type: jpg Geometry.jpg (47.1 KB, 8 views)
File Type: jpg Residuals.jpg (85.4 KB, 14 views)
File Type: jpg Residuals2.jpg (78.9 KB, 13 views)
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