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.

Dynamic Viscosity of solids - Surrounding Material

Please login with a confirmed email address before reporting spam

Hello everyone,

I am trying to simulate joule heating & heat transfer in a MEMS device (materials: polysilicon and silicon nitride). I would also like to add air in the surroundings.

When I run the simulation, it gives an error saying that the dynamic viscosity of the materials in missing - however, I could find no clue about these values for the materials I am using. So what is the way around that?

To add air in the surroundings, I am trying to add laminar flow on the boundaries - is that correct, and how to make it consider air as the material? Otherwise are there any other possible ways of doing that?

Would appreciate your help, Thank you


0 Replies Last Post Nov 27, 2022, 7:00 a.m. EST
COMSOL Moderator

Hello Josee Mallah

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.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.