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 The information provided may be out of date.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.
no convergence for cylinder under external pressure
Posted 07.02.2014, 09:25 GMT-5 Computational Fluid Dynamics (CFD), Structural Mechanics Version 4.4 1 Reply
Please login with a confirmed email address before reporting spam
I have a 2D model of a cylinder tube.
External pressure acts on the outer wall of the cylinder, a different pressure on the inner wall.
The analysis does not converge:
I get an error message:
"Failed to find a solution for the initial parameter./Maximum number of Newton iterations reached./There was an error message from the linear solver./The relative error (3.9e+002) is greater than the relative tolerance./Returned solution is not converged./ - Feature: Stationary Solver 1 (sol1/s1)"
What is missing, to make it converge?
I include a model file.
I got the same problem with a 3D modeling of a cylinder tube, if I put the base on a "Roller" foundation, while it does converge, if I use "fixed constraint".
External pressure acts on the outer wall of the cylinder, a different pressure on the inner wall.
The analysis does not converge:
I get an error message:
"Failed to find a solution for the initial parameter./Maximum number of Newton iterations reached./There was an error message from the linear solver./The relative error (3.9e+002) is greater than the relative tolerance./Returned solution is not converged./ - Feature: Stationary Solver 1 (sol1/s1)"
What is missing, to make it converge?
I include a model file.
I got the same problem with a 3D modeling of a cylinder tube, if I put the base on a "Roller" foundation, while it does converge, if I use "fixed constraint".
Attachments:
1 Reply Last Post 12.02.2014, 05:05 GMT-5
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
With increasing experience I found the solution for 2-D myself: I need to insert a "fixed constraint" at two "points" or a "roller" on one surface segment.