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.
Modeling Boltzmann Transport equation in COMSOL using coefficient form of PDE
Posted 19 nov 2015, 22:03 GMT-5 Heat Transfer & Phase Change, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers Version 5.1 1 Reply
Please login with a confirmed email address before reporting spam
I am modeling Phonon transport using Boltzmann transport equation.
Referring:
a. www.comsol.com/paper/nanoscale...tzmann-transport-equation-6408
b. www.comsol.com/paper/finite-el...ransfer-in-two-di-19319
As an initial case, I am simulating a 1D Geometry (line) with Dirichlet BC at the ends.
a. However, I am unsure on the implementation of the Discrete Ordinates method (using Gauss Quadrature)** - specifically the weights applied.
1. I have referred pomax.github.io/bezierinfo/legendre-gauss.html and www.nptel.ac.in/courses/112101001/downloads/lec29.pdf to get the weights. However, these present apparently different values.
Would appreciate some insight into the discrete ordinates method implementation (it's weights) while using the PDE Coefficient form.
Attached is the model. A more detailed description is provided in the model root name (presentation section)
** I know that COMSOL does implement DOM method for Surface-Surface radiation model. However, although these equations (1D-BTE and radiative transport) are very similar, due to relaxation time approximation in BTE , I have to use PDE form.
If someone has solved BTE using built in surface-surface radiation model, I would be happy yo gain insights.
Thanks
Regards
Yash Ganatra
Attachments:
Hello Yash Ganatra
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.
Please login with a confirmed email address before reporting spam
your file " COMSOL_BTE_11_19.mph" canot be opened in comsol 5.1.
would you like to send us the file again?
Thank you very much !
Best wishes!
Apeng