“norm length” in lumerical transient simulation example

- April 11, 2022 at 5:56 pm
  
  Mariah Ha
  Subscriber
  
  Hello,
  My question is regarding lumerical transient example which is in lumerical courses (/courses/index.php/courses/lumerical-charge-small-signal-ac-and-transient-simulations/lessons/transient-simulations-lesson-2/) . Why the norm length in charge solver is set to "100 microns" for the 2D simulation for normalization, although the length of the device in the third direction (y) is 2 microns only not 100 .
  Thank you.
- April 11, 2022 at 7:43 pm
  
  Guilin Sun
  Ansys Employee
  
  The norm length in charge solver set to "100 microns" is the default, arbitrary choice I believe. This value is needed to get the current value, as internally the solver calculates the current density, not the current its self. Therefore the result "current" can be "arbitrary" depending on this norm length. The current density is fixed though.
  If you know the length in the 3rd dimension, you can use it.