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.
Diffusion in a solid cylinder
Posted 20.11.2018, 20:43 GMT-5 Version 5.3a 0 Replies
Please login with a confirmed email address before reporting spam
Hello!
I am trying to map the diffusion in a cylinder with the parameters of .25 dia / 2 length ( -1 to 1), specifically to understand the effects of removing boundary conditions and the effect this has on the simulation time to reach steady state.
Initially, I'm working with a 1-D axial diffusion set up, with insulation imposed on the cylinder length wise. All's well and good here, the solution approaches steady state in ~2,1 seconds.
Then, my objective is to do a 2-D analysis by removing the insulating boundary condition on the surface of the cylinder's length. I've tried to do this by over riding the flux condition, as well as an open boundary condition, however i am still getting 2.1 seconds to steady state, what gives?
My values for clarification - initial concentration is zero, diffusion is set to 1, and the concentrations on either end are set to 1.
Additionally, I want to make this a 3-D model by breaking symmetry along the theta direction, ie making theta vary from 0 to pi at the maximum radius. Any idea how to do this on comsol? I'm relatively new, and any help would be appreciated!
Thank you!
Attachments:
Hello Jose Bravo
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.