non contacting parts error in heat transfer module

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I imported a complex geometry in comsol to use heat transfer in solids and heat transfer by surface-to-surface radiation. During the import and form union, there are some parts that comsol can not recognize their connection to the neighboring parts. As results, those parts became cooler than every temperature I defined weirdly. how should I suppress this error to at least keep the non-contacting surfaces in the initial value?


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