Geometry
To save time, you can load the geometry sequence from a file. This sequence can then be edited at any time by expanding the Geometry  node.
1
In the Geometry toolbar click Insert Sequence .
2
Browse to the application library folder and double-click the file laminar_mixer_particle_geom_sequence.mph. The location of the files used in this exercise varies based on your installation. For example, if the installation is on your hard drive, the file path might be similar to C:\Program Files\COMSOL\COMSOL64\Multiphysics\applications\. The folder for this example is Particle_Tracing_Module\Fluid_Flow.
3
Click Build All  to see the geometry.
Alternatively, you can build the geometry, one step at a time. The modeling instructions for the Particle Trajectories in a Laminar Static Mixer example model in the Application Libraries include an appendix with a complete set of geometry setup instructions. Another alternative is to load a CAD geometry from another program by clicking the Import  button in the Geometry toolbar.
The surfaces of the mixing blades can be difficult to see because they are covered by the outer surfaces of the flow channel. There are several ways to view the inside of the geometry more easily. One option is to click the Wireframe Rendering button  in the Graphics toolbar, to hide all surfaces in the Graphics window.
An alternative is to click the Select Boundaries  and Click and Hide  buttons in the Graphics toolbar. Then you can hide the outer surfaces of the channel by clicking on them. The resulting view is shown below.
The mixer geometry consists of three twisted blades, each making a 90 degree angle with the adjacent blades. The middle blade is twisted in the opposite direction from the first and last blades.