Menu

Discussion Forum

New Discussion
Filter

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.

Seriously sick pre-conditioner.

Posted Dec 23, 2023, 3:15 a.m. EST Computational Fluid Dynamics (CFD), Optimization, Studies & Solvers Version 6.2 1 Reply

兆炜 何
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

While performing 3D fluid topology optimization, an error occurred: "Solution not found. At velocity u, pressure p. Severe pathological preconditioner. The returned solution does not converge. Not all parameter steps were returned." How should this error's be solved? What does the severe pathological preconditioner stand for?

1 Reply Last Post Jan 2, 2024, 4:26 a.m. EST
Kristian Ejlebjærg Jensen COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 11 months ago Jan 2, 2024, 4:26 a.m. EST
Updated: 11 months ago Jan 2, 2024, 7:02 a.m. EST

Hi

Does the problem happen immediately for the first iteration? It could be that you are using a Fully Coupled solver, when a Segregated approach would be better.

Best regards

Kristian. E. Jensen

Technical Product Manager, Optimization

Hi Does the problem happen immediately for the first iteration? It could be that you are using a Fully Coupled solver, when a Segregated approach would be better. Best regards Kristian. E. Jensen Technical Product Manager, Optimization

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.

Suggested Content