About Editing Geometry Length and Angular Units
The default units are meters for length and degrees for angles. For many applications, an independent length unit for the geometry might be required. For example, if the model describes a MEMS device, the natural length unit might be µm (micrometers), or the geometry imported from a CAD file might use another unit than meters. It can also be useful to specify the angular unit in radians instead.
The length unit for the geometry does not affect the units that include length in the physics interfaces or any other part of COMSOL Multiphysics.
1
Create or open a model file.
2
In the Model Builder, under a Component node, click the Geometry node.
3
Under Units, select a Length unit from the list.
4
Select an Angular unit: Degrees or Radians.
5
Select the Scale values when changing units check box to automatically scale for dimensions in the existing geometry.
6
Enter a Default relative repair tolerance and select a Geometry representation.
When importing 3D CAD geometries, you can choose to use the length unit from the CAD file or the length unit from the COMSOL Multiphysics software.
The Geometry Node