See Built-In Operators in the COMSOL Multiphysics Reference Manual for additional information about the ballavg and diskavg operators.
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You can specify the source to be a harmonic perturbation in a frequency domain analysis. To mark the source as being a harmonic perturbation, right-click the node and choose Harmonic Perturbation. Note that this updates the node’s icon. See Theory for Harmonic Heat Transfer for more details.
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Heat Conduction with a Localized Heat Source on a Disk: Application Library path Heat_Transfer_Module/Verification_Examples/localized_heat_source
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