Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Questions about flux in transport of dilute species
Posted 04.11.2011, 04:55 GMT-4 Version 4.2a 0 Replies
Please login with a confirmed email address before reporting spam
I'm building a semiconductor quantum well model using electrostatics together with transport of dilute species (TDS). I use one TDS for the main electron population outside the well and one TDS model for the electron population inside the quantum well. I want to model the exchange between these two electron populations using flux due to thermionic emission into and out of the quantum well. I am using flux nodes at the boundary between the different regions in order to implement this behavior.
I am having problems understanding how the flux works in the TDS. Even with all flux disabled (and a 'no flux' default node active on all boundaries), if I plot 'normal total flux' along the boundaries, this is not zero but instead a large number. Since the 'no flux' node is the only specified flux in the TDS models, shouldn't the flux normal to the boundary be zero?
More generally, if I plot the flux normal to any boundary to the region where the 'no flux' node is active, I do get a finite flux.
How do I implement a flux through the boundary that is set specifically by my expression for thermionic emission?
Best,
Kristian
Hello Kristian Storm
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.