See Introduction to Solvers and Studies and Solution Operation Nodes and Solvers in the COMSOL Multiphysics Reference Manual.
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Acoustic–Structure Boundary, gives one iterative solver suggestion. The suggestion depends on which physics are coupled with the multiphysics coupling. Different suggestions are given when coupling acoustics to shell/membrane and solid. The suggestion will also be different depending on if the acoustics interface is based on the FEM or BEM formulation.
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Thermoviscous Acoustic–Structure Boundary, generates two suggestions. The first is fast and can save 20% of memory while the second that uses domain decomposition (DD) is very robust and memory lean.
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Combining Acoustic–-Structure Boundary and Piezoelectricity yields a suggestion that can be used for modeling large piezoelectric transducer assemblies.
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The Acoustic BEM–FEM Boundary generates a dedicated hybrid iterative solver to solve the combined FEM and BEM problems.
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