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 The information provided may be out of date.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.
setting mass flow rate at inlet
Posted 14 giu 2013, 16:53 GMT-4 Computational Fluid Dynamics (CFD) Version 4.3b 2 Replies
Please login with a confirmed email address before reporting spam
Model description
I have a 3D laminar air flow inside channel whose cross section is rectangle. for BC ,
1- the inlet , mass flow rate boundary is set (kg/s),
2- the outlet , zero pressure p=0 pa
3- the all other boundaries are symmetry.
My problem:
When I run it, I have a problem with convergence , then eventually failed to find the solution
Thanks
Attachments:
Hello Ahmed Suleiman
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
I know that it's the old post, but I'll try to ask, because I have the same problem here. Did you find the solution?
Please login with a confirmed email address before reporting spam
have you tried to either ramp up the flow, or add some more realistic initial conditions, as some average velocity and Poiseuille first estimate pressure drop across the channel as initial conditions ?
Starting a CFD model with "0" initial conditions and high inlet flow is tricky and not really "physical"
--
Good luck
Ivar