CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Energy Divergence

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 16, 2018, 16:32
Default Energy Divergence
  #1
New Member
 
Andrew M
Join Date: Apr 2018
Location: Toronto
Posts: 18
Rep Power: 6
michal28 is on a distinguished road
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)
michal28 is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
PEMFC model with FLUENT brahimchoice FLUENT 22 April 19, 2020 15:44
[ANSYS Meshing] Help with element size sandri_92 ANSYS Meshing & Geometry 14 November 14, 2018 07:54
fluent divergence for no reason sufjanst FLUENT 2 March 23, 2016 16:08
help with energy eq divergence lord_rayleigh FLUENT 1 July 18, 2014 08:12
Divergence problem Smaras FLUENT 13 February 21, 2013 05:03


All times are GMT -4. The time now is 20:02.