Objective function for time-dependent optimization in thin film simulation

Joan Castello Belenguer

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Hello everyone,

I recently started working on COMSOL to solve a problem on a 2D squeeze film gas-lubrication. I want to perform a time-dependent optimization, however I am encountering some issues.

As my geometry is a short height cylinder surface which represents the profile, and the pressure is evaluated around the circular surface. My idea is to perform the time dependent optimisation is to use a Squared Error function.

The idea is to minimize the value of the function to find the steady stable pressure range of the system. However, I am not able to introduce the pfilm dependent variable, for which the Thin-Film Flow (tff) module is solving, as a variable in the objective function, however Comsol returns a message saying that the variable pfilm is not defined, also I tried using "tff.pfilm". I also tried using the average operator and integral operator but returns the same error.

I dont have that much experience with comsol yet, is anyone able to help me or provide any hints?

Thank you! Joan



1 Reply Last Post Oct 16, 2024, 3:22 a.m. EDT
Acculution ApS Certified Consultant

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Posted: 2 weeks ago Oct 16, 2024, 3:22 a.m. EDT

Maybe "comp1.tff.pfilm" instead, if the variable in question actually exists? Don't know anything about the physics though.

-------------------
René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
Maybe "comp1.tff.pfilm" instead, if the variable in question actually exists? Don't know anything about the physics though.

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