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.

How to dimensionless N-S control equations?

Please login with a confirmed email address before reporting spam

In multi-objective topology optimisation, how to normalise the objective function for different physical fields is a crucial factor for convergence. By means of dimensionless equations, the problem of the huge difference in the order of magnitude of the objective function can be fundamentally solved. My question is, how to input the equations in dimensionless form in comsol? In my model, some of the physical quantities can be dimensionless, but if I want to extract the built-in variables of the software (e.g. in the laminar flow module, spf.Qvd represents the flow dissipation of the system), how can I get the results in dimensionless form? Without dimensionlessness, the variables will always be shown in yellow in the software. Dimensionlessness is done formally by dividing the variable by 1 [units], but I think this method is flawed. I wonder if there are other methods of dimensionlessness?



0 Replies Last Post 17.01.2024, 08:27 GMT-5
COMSOL Moderator

Hello YL Gavin

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.