Thinning Issue After Smoothing in Peltier Cooler Model

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I'm working on a Peltier cooler model with topology optimization in COMSOL. I used the smoothing operation from the official "Topology Optimized Hook" model. https://www.comsol.com/model/exporting-and-importing-a-topology-optimized-hook-68861 After smoothing, the TE leg on the right became thinner, which is a concern because it affects the structure's integrity.

Can you advise how to smooth without making critical parts thinner? I’ve attached an image to show the problem.

Thank you!



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