## How to Make Boundary Conditions Conditional in Your Simulation

##### Henrik Sönnerlind June 27, 2016

Say you are working on a modeling case where loads are moving in such a way that they cross over different mesh elements and boundaries during the simulation. In these cases, among other instances, you may want to apply a boundary condition to only part of the geometrical boundary or only under certain conditions. In this blog post, we’ll discuss how you can utilize the flexibility of COMSOL Multiphysics to handle such situations.

### How to Model Solar Concentrators with the Ray Optics Module

##### Christopher Boucher June 23, 2016

A paraboloidal solar dish can focus solar radiation onto a small target or cavity receiver. Because solar energy is collected over a large area, the incident heat flux at the receiver is extremely high. This thermal energy can then be converted to electrical energy or used to produce a chemical energy source, such as hydrogen. Today, we discuss strategies for computing the distribution of heat flux in the focal plane of a typical solar dish concentrator/receiver system.

### Thermal Modeling of the Air Flow Inside and Around Your House

##### Walter Frei June 22, 2016

Have you ever wanted to quickly predict the temperature of an enclosed structure, such as your house, that is exposed to ambient environmental conditions? The temperature inside depends on the surrounding air temperature, wind speed, and solar loads, all of which have significant variability. For simplicity, we often also want to approximate the inside air as well-mixed. Today, we will discuss the tools in COMSOL Multiphysics that help you quickly build such thermal models.

### Designing Reliable and Efficient CDRA Systems with Simulation

##### Caty Fairclough June 21, 2016

Manned vessels traveling through space require highly efficient and reliable life support systems, such as carbon dioxide removal assemblies (CDRAs). Poorly designed systems can shorten missions and cause potential danger. Simulating CDRA systems, however, can be quite time-consuming and difficult due to their complex nature. To address such challenges, a team at NASA’s Marshall Space Flight Center developed a 1D model in the COMSOL Multiphysics® software to efficiently analyze the 4-bed molecular sieve (4BMS) of a CDRA system.

### Using the New Ray Tracing Algorithm in COMSOL Multiphysics® 5.2a

##### Christopher Boucher June 20, 2016

With the release of COMSOL Multiphysics® version 5.2a, it is now possible to trace rays in unmeshed domains and even release and trace rays outside a geometry. The Ray Optics Module provides an entirely new algorithm that offers these capabilities and more, so that you can model your ray optics designs with ease and accuracy. Let’s investigate how this new algorithm affects your workflow when setting up a typical ray optics model.

### User Feedback Powers COMSOL Multiphysics® Version 5.2a

##### Bridget Cunningham June 17, 2016

We have been extensively collecting user feedback and are now happy to share the resulting software enhancements with the release of COMSOL Multiphysics® software and COMSOL Server™ product version 5.2a. The latest version of the COMSOL® software includes many new and improved features and functionality to help you further optimize and advance your modeling processes.

### AltaSim Uses Simulation to Improve Bolometer Sensitivity

##### Caty Fairclough June 15, 2016

Bolometers have the ability to detect and measure the power of incident electromagnetic radiation. This allows them to be used in a range of technologies, from night vision cameras to far-reaching astronomy projects. Designing bolometers often requires devoting a lot of time and energy to the development phase, as these devices must be optimized for sensitivity and customized for their specific applications. To efficiently design bolometers with increased sensitivity, AltaSim Technologies utilized the simulation capabilities of COMSOL Multiphysics.

### Part 2: Model a Linear Electromagnetic Plunger with a Blocker

##### Nirmal Paudel June 14, 2016

In the previous part of our Electromagnetic Device series, we showed you how to model a linear electromagnetic plunger attached to a spring and damper and compute the position, velocity, and electromagnetic forces. Here, we will demonstrate an actuator that includes a blocker/stopper to restrict linear motion. We will also discuss how to model the contact and release of this actuator using the Events, Magnetic Fields, Moving Mesh, and Global ODEs and DAEs interfaces.

### Stretchable Electronics Blend Flexibility with High Performance

##### Bridget Cunningham June 13, 2016

Strong performance is a key focal point in designing any electronic device. In an effort to extend the design space for further applications and to take steps toward realizing the Internet of Things, the desire for high performance is now paired with an interest in achieving greater physical flexibility — a change from today’s rigid and brittle electronic devices. See how stretchable electronics are successfully blending strength and flexibility to offer new opportunities for technological growth.

### App: Analyze the Design of a Viscoelastic Structural Damper

##### Abbie Weingaertner June 9, 2016

Ever been in a tall building on a windy day or had an aircraft pass over your house? Along with the noise that you hear, which can be disruptive and unpleasant in its own right, you’ll also notice some low-frequency vibrations that can ultimately affect the structure’s stability. One solution to this problem is to incorporate dampers, particularly viscoelastic structural dampers, into the structure’s design. With simulation apps, the path to optimizing these devices is more efficient than ever before.

### Evaluating Static Mixer Performance with a Simulation App

##### Christopher Boucher June 8, 2016

Static mixers are well-established tools in a wide variety of engineering disciplines due to their efficiency, low cost, ease of installation, and minimal maintenance requirements. When evaluating whether a mixer can be used for a certain purpose, it is important to determine whether the resulting mixture is sufficiently uniform. In this blog post, we will discuss the setup of an app designed to quantitatively and qualitatively analyze the performance of a static mixer using the Particle Tracing Module.