Hi Greg,
The Morison discs in Aqwa are purely abstract - they don't have any structural mass or physical thickness. Their only properties are the values required for the Morison equation, i.e. diameter, Ca and Cd, plus the disc normal direction.
The error messages are due to some diffracting panel elements failing the mesh quality checks. You can change the errors to warnings by clicking on the Hydrodynamic Diffraction Analysis Settings, and changing 'Ignore Modelling Rule Violations' to 'Yes'.
Generally we recommend that the proportion of elements failing the mesh checks is small (< 1%) compared to the total number of diffracting elements. Otherwise, you may need to reduce the mesh size a bit.
Cheers, Mike
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