Note that the forces applied on the fluid flow rely on the gradients of the acoustic fields. Therefore, to obtain continuous and smooth derivatives, it is recommended to use a higher element order than the default setting for The Thermoviscous Acoustics, Frequency Domain Interface (see the Discretization section). It is recommended to use quadratic serendipity for the acoustic pressure and cubic serendipity for the acoustic velocity and temperature. This discretization is automatically set when adding the predefined multiphysics interfaces.
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