Summary
For simulation of the movement of dusty air and dust extraction start with some known solutions.
Setup Details
Simulate dusty air with a variety of sizes of entrained particles like saw dust would have.
3D design (or fine designs) of cyclone dust separators such as:
https://grabcad.com/library/cylone-dust-collector-1

The Simulation
Now put dusty air through the cyclone dust separator.
Results Analysis
Does the simulated system separate larger particles from smaller as real world saw dust is separated?
Report here:
Summary
For simulation of the movement of dusty air and dust extraction start with some known solutions.
Setup Details
Simulate dusty air with a variety of sizes of entrained particles like saw dust would have.
3D design (or fine designs) of cyclone dust separators such as:

https://grabcad.com/library/cylone-dust-collector-1
The Simulation
Now put dusty air through the cyclone dust separator.
Results Analysis
Does the simulated system separate larger particles from smaller as real world saw dust is separated?
Report here: