## Exploiting Maximum Principles to Save Time and Resources

##### Temesgen Kindo May 9, 2017

When your simulations consume significant memory, do you buy a bigger computer? When they take too long to solve, do you just run them overnight? Often, you don’t have another option. But sometimes, if you have the right tools, you can find a better approach by exploiting the mathematical structure. Today, we will show you how to use the so-called maximum principles to save computational resources and time in the COMSOL Multiphysics® software.

### How to Use the Find and Auto Completion Tools for Faster Model Setup

##### Amelia Halliday May 8, 2017

When making improvements to a model in the COMSOL Multiphysics® software, you are likely to add more parameters and variables. As the complexity of your model grows, it can become difficult to keep track of where these parameters are being used and defined, as well as to recall them for use in the settings of other nodes. In this blog post, we show you how to use the Auto Completion and Find tools for efficient model setup.

### Capturing Eddy Current Losses in a Permanent Magnet Motor Design

##### Bridget Cunningham May 4, 2017

Permanent magnet motors are useful in various high-end applications, but they come with design limitations. One example is their sensitivity to high temperatures, which can result from heat losses generated by currents — specifically, eddy currents. Version 5.3 of the COMSOL® software includes functionality to capture eddy current losses in the permanent magnets of such motors. Engineers can use these results to better understand the full behavior of permanent magnet motors and identify ways to optimize their performance.

### Modeling a Transient Contact Problem with Stick-Slip Friction Transition

##### Bridget Cunningham May 3, 2017

For many mechanical contact problems, stick-slip friction transition is an important point of analysis. When present, this phenomenon influences the stresses, strains, and deformations near the contact area between the two bodies. In version 5.3 of the COMSOL Multiphysics® software, we have the tools necessary to handle this type of mechanical contact problem and validate the results. With a better understanding of stick-slip friction transition and its subsequent effects, we can improve the safety and energy efficiency of relative systems.

### How to Use the New Ray Termination Feature for Geometrical Optics

##### Christopher Boucher May 2, 2017

The release of version 5.3 of the COMSOL Multiphysics® software includes a new Ray Termination feature to simplify the setup and results analysis for optical simulations with the Ray Optics Module. Use the Ray Termination feature to remove rays that are no longer relevant to the solution, either because they have escaped from the geometry or their intensity is negligibly small. In this blog post, we’ll learn how to use this feature and see how it simplifies ray optics simulation.

### Faraday Cages Say ‘Do Not Pass’ to Electromagnetic Waves

##### Brianne Costa May 1, 2017

We thrive on the ability to stay constantly connected to the rest of the world through technology. But there are times when our devices hold us back, distracting us when we should be working on an important project or connecting with friends over dinner. Fortunately, a device that was first theorized over 200 years ago — the Faraday cage — offers a way to take ourselves offline, if only for a little while.

### Modeling Natural and Forced Convection in COMSOL Multiphysics®

##### Walter Frei April 28, 2017

Whenever we have a heated or cooled part exposed to air, there is some transfer of heat from the part to the air via convection. The movement of the air can be either forced, via a fan, or free, as a result of the natural buoyancy variations due to changes in the air temperature. Today, we will look at several different ways of modeling these types of convection in the COMSOL Multiphysics® software.

### Analyzing a Silicon Solar Cell Design with the Semiconductor Module

##### Caty Fairclough April 27, 2017

When analyzing semiconductor devices, it is important to account for the multiple physics affecting their performance. The Semiconductor Module — an add-on product to the COMSOL Multiphysics® software — can help you model these complex devices. In this blog post, we discuss a new tutorial model of a 1D silicon solar cell, which is available with the latest release of the COMSOL® software, version 5.3.

### Analyzing Heat and Mass Transfer During Cake Baking with Simulation

##### Bridget Cunningham April 26, 2017

Sometimes when you bake a cake, it doesn’t turn out how you expected. Part of this is due to the underlying heat and mass transfer phenomena that occur within the baking process, which affect the end result. With tools like the COMSOL Multiphysics® software, you can study and predict how these mechanisms work and use this knowledge to bake a better cake.

### Speed Up Your Modeling with COMSOL® Software Version 5.3

##### Fanny Littmarck April 25, 2017

Ready to speed up your modeling? Today, we released a new version of the COMSOL Multiphysics® software and COMSOL Server™, version 5.3, and we think you’ll love the performance improvements.

### A Multilevel Approach to Modeling Planar Discharge in CO2 Lasers

##### Bridget Cunningham April 24, 2017

Due to the complex pumping scheme of high-power CO2 lasers, there are many species and collisions to consider in their analysis. This makes modeling plasma behavior in these devices — a key element in their optimization — a challenging task. Applying a multilevel approach, one researcher used the COMSOL Multiphysics® software to create a full 3D model of planar discharge in a CO2 laser. The results showcase the homogeneity of the discharge while offering further potential for optimizing laser designs.