Error when calculating patch interpolation coefficients

When running a case with a rotational volume zone, if you get a solver error that looks like this:

Error when calculating patch interpolation coefficients. Patch has a distance mismatch of 0.7883948e-01
with matching patch at location [1.7592032e-1, 1.0184957e-03, -4.7304816e-1].

This means that at a given time step, once the mesh has been rotated according to the prescribed motion, the maximum distance between the two interfaces is 0.7883948e-01. If this maximum distance between the two patches is greater than 20% of the maximum edge length contained in either patch, this error will be raised. It indicates that either the center of rotation/axis of rotation is likely incorrect or that the mesh is too coarse in this location.

This threshold is controlled by the interface_interpolation_tolerance parameter (a field of Fluid, default 0.2); the 20% above corresponds to that default. If the two patches are intentionally separated and should not exchange data (for example, both sides have wall boundary conditions), you can increase interface_interpolation_tolerance to relax or effectively disable this check. This is a solver parameter, distinct from the meshing sliding interface tolerance (which controls how curves lying on sliding interfaces are detected during mesh generation and has no effect on this check).