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‘fatal error’ in a DC Conduction model when material conduction is too low

- April 27, 2021 at 5:40 pm
  
  js175rice
  Subscriber
  
  (First time user)nWe have what appears to us to be a simple conduction model of tissue around a medical device. In short, there is a small current sink in the tissue (active neural tissue) with a distant ground (V=0) and a larger insulating body (sigma = 0 or even as high as 0.01). If sigma_tissue is 1.1 [S/m] or greater then model works fine. If sigma_tissue <= 1.0 then it gives the following error. Also showing a picture of the current sink and larger insulating body when sigma = 1.01. The tissue block is 14x14x14mm surrounding the sink and insulator (not seen). (We have also modeled this in COMSOL with good success using identical parameters.) I can share the file if that is helpful. Zip?
- April 28, 2021 at 2:23 pm
  
  DELI
  Ansys Employee
  
  Default Insulator/Conductor threshold is 1 Siemens/m, and user can manually change this in Design Settings.
  Top Menu Bar->Maxwell 3D->Design Settings
- August 4, 2022 at 7:49 pm
  
  HDLI
  Ansys Employee
  
  Hello!
  There are material thresholds in menu Maxwell 3D->Design Setting.... Generally, the default value of conductivity of insulator is 1, so it would be insulator if sigma_tissue <= 1.0.
  Please change the material threshold to a proper value to consider the sigma_tissue's conductivity of <= 1.0.
  HDLI

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