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How to dimensionless N-S control equations?

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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 Jan 17, 2024, 8:27 a.m. EST
COMSOL Moderator

Hello YL Gavin

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