Overview of the User’s Guide
The Molecular Flow Module User’s Guide gets you started with modeling using COMSOL Multiphysics. The information in this guide is specific to this module. Instructions how to use COMSOL Multiphysics in general are included with the COMSOL Multiphysics Reference Manual.
As detailed in the section Where Do I Access the Documentation and Application Libraries? this information can also be searched from the COMSOL Multiphysics software Help menu.
Modeling in Molecular Flow
The Modeling Guidelines chapter discusses these topics: Molecular and Rarefied Gas Flows, Modeling Transitional Flows, and Modeling Free Molecular Flows.
Rarefied Flow
Rarefied Flow Interfaces describes The Transitional Flow Interface and The Free Molecular Flow Interface including the underlying theory for the physics interfaces.