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 The information provided may be out of date.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.
Solver settings study step
Posted 20 apr 2011, 03:08 GMT-4 Studies & Solvers Version 4.1 2 Replies
Please login with a confirmed email address before reporting spam
Hi
I'm using a stationary study for my problem in v4.1. When the Dependent Variable in solver settings was set to "defined by study step- step 1:stationary", the solution was not converging. But when I set the same to "defined by study step: user defined" the solution converges. Can anyone point out the logic behind this change affecting the convergence of the solution.
Thanks in advance.
Rahul
I'm using a stationary study for my problem in v4.1. When the Dependent Variable in solver settings was set to "defined by study step- step 1:stationary", the solution was not converging. But when I set the same to "defined by study step: user defined" the solution converges. Can anyone point out the logic behind this change affecting the convergence of the solution.
Thanks in advance.
Rahul
2 Replies Last Post 20 apr 2011, 03:27 GMT-4
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Hi
if I understand you well, you are changing the initial conditions (?) for your solver, this can indeed give a better starting point and allow the solver to find a solution (particularly the iterative ones)
--
Good luck
Ivar
if I understand you well, you are changing the initial conditions (?) for your solver, this can indeed give a better starting point and allow the solver to find a solution (particularly the iterative ones)
--
Good luck
Ivar
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Thanks for the reply Ivar.
But the initial conditions remained the same for both the cases i have described. The only change I made was the study step for dependent variable.
For your information, I had set the inital values for the problem as the velocities that are present in the actual flow itself, and not the defult value of zero, anticipating that it will help in better convergence.
I got the solution, but I couldn't understand the logic. If you can help me out, I will be thankful.
Regards
Rahul
But the initial conditions remained the same for both the cases i have described. The only change I made was the study step for dependent variable.
For your information, I had set the inital values for the problem as the velocities that are present in the actual flow itself, and not the defult value of zero, anticipating that it will help in better convergence.
I got the solution, but I couldn't understand the logic. If you can help me out, I will be thankful.
Regards
Rahul