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Standard isentropic acoustic models do not include the dissipative effects of viscous friction and heat conduction. These viscothermal effects can be important, for example in models of small acoustic transducers. Viscothermal acoustics can be modeled in arbitrary geometries with models that contain four or fivecoupled fields. Therefore, these fully coupled models are computationally costly.O nt he other hand, efficient approximate viscothermal acoustic models exist, butthese are only applicable to certain simplified geometries. Anew approximate model is presented which fills the gapbetween these twoextremes. This newmodel can be used for arbitrary geometries and has acomputational efficiencywhich is higher than the full model and lower than the models with geometrical constraints. The newmodel is derivedand demonstrated on several problems, including acoustic-structure interaction problems.

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