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?
Posted Jan 17, 2024, 8:27 a.m. EST Fluid & Heat, Computational Fluid Dynamics (CFD), Optimization 0 Replies
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?
Attachments:
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.