All posts by Christopher Boucher
![](http://cdn.comsol.com/wordpress/sites/1/2021/07/Blog_Header_Imgs_MirrorCurve_ThumbnailImg.png)
Curve Fitting of Solution Data in COMSOL Multiphysics®
We discuss curve fitting of continuous solution data, the concept of orthogonality, and how to fit solution data to a set of orthogonal functions for a simple and convenient postprocessing operation.
![](http://cdn.comsol.com/wordpress/sites/1/2020/12/COMSOL_Blog_ModelImgs_TurbomolecularPump_ThumbnailImg.png)
How to Analyze Turbomolecular Pumps with COMSOL Multiphysics®
Modeling gas flow in a turbomolecular pump calls for specialized numerical methods, because at such low pressures, the gas molecules rarely collide with each other.
![](http://cdn.comsol.com/wordpress/sites/1/2020/12/COMSOL_Blog_ModelImgs_LaminarMixer_ThumbnailImg.png)
What Formulation Should I Use for Particle Tracing in Fluids?
The COMSOL® software gives you 4 equation formulation options when modeling particle tracing in fluids: Newtonian; Newtonian, first order; Newtonian, ignore inertial terms; and Massless.
![](http://cdn.comsol.com/wordpress/sites/1/2020/11/COMSOL_Blog_ModelImgs_ElectronBeam_ThumbnailImg.png)
Modeling a Pierce Electron Gun in COMSOL Multiphysics®
Cathode ray tubes, electron microscopes, spectrometers, and particle accelerators: These devices and components commonly use Pierce electron guns.
![](http://cdn.comsol.com/wordpress/sites/1/2019/02/COMSOL_Blog_ModelImgs_FresnelRhomb_ThumbnailImg.png)
Studying the Polarization of Light with a Fresnel Rhomb Simulation
A Fresnel rhomb is a simple optical system for studying light polarization. Follow along as we simulate linearly, elliptically, and circularly polarized incident light in a Fresnel rhomb.
![](http://cdn.comsol.com/wordpress/sites/1/2018/11/COMSOL_Blog_ModelImgs_PetzvalLensSTOP_ThumbnailImg.png)
How to Perform a STOP Analysis with COMSOL Multiphysics®
Interested in structural-thermal-optical performance (STOP) analysis? We go over the theory, background, and how to perform such an analysis in the Ray Optics Module.
![](http://cdn.comsol.com/wordpress/sites/1/2018/04/COMSOL_Blog_ModelImgs_Laser_ThumbnailImg.png)
Ray Optics Simulation of Sagnac Interferometers and Ring Laser Gyros
Have you ever been in a revolving restaurant that slowly spins as you dine? This same concept can be used to understand the operating principles of Sagnac interferometers and ring laser gyros.
![](http://cdn.comsol.com/wordpress/sites/1/2017/05/COMSOL_Blog_ModelImgs_CzernyTurner_ThumbnailImg.png)
How to Use the New Ray Termination Feature for Geometrical Optics
You can simplify your optical simulations performed with the Ray Optics Module — including model setup and results analysis — with the Ray Termination feature. Read about how to use it here.