Under a Mesh Part node you add nodes for importing and modifying an externally generated mesh.
The Settings window for a
Mesh Part node contains the following section:
Mesh files are unitless, which means that the physical size of an imported mesh is independent of the length unit of the mesh part. Select the Scale values when changing units check box to scale the unit-dependent properties of the mesh part’s nodes such that these properties remain unchanged. The default setting is to not scale the values when changing units; the program then interprets the values for the geometric dimensions using the new units for length and angle. The values themselves do not change.
From the Length unit list select the length unit to use in property fields for lengths. When solving the model, all lengths are converted to the base unit for length. If you change the unit, COMSOL Multiphysics
converts all pure numeric values in fields for lengths to the new unit, if you have selected the
Scale values when changing units check box (see above).