# COMSOL Blog

## 2014 COMSOL Training Course Series Released

##### Lauren Sansone | January 16, 2014

Whether you are interested in an introduction to COMSOL Multiphysics or want to delve deeper into application-specific courses, you will want to check out the newly released 2014 Training Course series. This is your opportunity to advance your simulation skills and maybe show off to your colleagues how quickly you can set up and solve a complex model. At a COMSOL training course, you can learn tips and tricks from skilled application experts as well as the modeling of applications […]

### Modeling PSU Cooling with COMSOL

##### Alexandra Foley | January 15, 2014

With shrinking electronic devices and ever-increasing power densities, efficient thermal management is at the heart of many R&D activities for electronics engineers. When developing complete systems containing multiple components, designs can become rather complex. An example of such a design would be a computer power supply unit (PSU), which can include not only electronics, but also multiple heat sinks, cooling fans, perforated grilles, and other large components — all within a small enclosure. In this blog post, we will explore […]

### Solving Algebraic Field Equations

##### Bjorn Sjodin | January 14, 2014

Many of our users are well aware of the fact that COMSOL Multiphysics can be used to solve partial differential equations (PDEs) as well as ordinary differential equations (ODEs) and initial value problems. It may be less obvious that you can also solve algebraic and even transcendental equations, or in other words, find roots of nonlinear equations in one or more variables with no derivatives in them. Are there real applications for this? Absolutely!

#### Article Categories

##### Fanny Littmarck | January 13, 2014

It’s easy to navigate from place to place thanks to GPS, but what about once you actually get there — what about navigating indoors? From venues of leisure to buildings in flames, there are many situations where indoor location tracking is useful. GPS technology does not work inside buildings, but there are now other methods under development that will make indoor navigation possible as well.

### Upcoming Webinar on Particle Tracing Simulations

##### Lexi Carver | January 10, 2014

Charged particles (such as ions and electrons) are susceptible to electromagnetic fields that exist in the space they occupy. Macroscopic and microscopic particles (dust, pollutants, etc.) are primarily susceptible to forces due to the background fluid (liquid or gas) in which they reside. Particles may also interact amongst each other, or influence the surrounding fields. For systems such as particle accelerators, aerosol distributors, and filtration devices, it can be helpful to calculate particle trajectories or know where the collisions and […]

### Differentially Pumped Vacuum Systems for Spectroscopic Imaging

##### Jennifer Segui | January 9, 2014

Spectroscopic imaging has been used for decades to map the chemical composition of material surfaces with atomic-scale resolution. In order to achieve adequate chemical specificity and spatial resolution during imaging, both the material sample and the imaging system are placed under high or ultra-high vacuum (UHV). In practice, materials are often used outside of vacuum environments and therefore it is also necessary to evaluate their surface properties at higher or ambient pressure. Differential pumping is the key to designing vacuum […]

### Parameterizing the Dimensions of Imported CAD Files

##### Walter Frei | January 8, 2014

When you are working with foreign CAD data, such as files in STEP or IGES file formats, you may think that you need to re-import a new CAD file and start your modeling over from scratch if you want to study a change in size or shape. But, in fact, you can modify the geometry that you’ve imported with some clever usage of the Deformed Geometry interface in COMSOL Multiphysics. Here, we will look at how this can be done.

### Simulating an RF MEMS Switch

##### Lexi Carver | January 7, 2014

An RF MEMS switch is an electromechanical component found in RF systems. It usually consists of a micromechanical bridge or cantilever, a substrate, and an electrode or dielectric layer. These devices can switch at RF frequencies and tend to have high isolation, i.e. power loss when the switch turns off; low insertion loss (loss of signal power when the switch is on), and extremely low (almost zero!) power consumption. Letâ€™s take a look at how you can use COMSOL Multiphysics […]

### Conjugate Heat Transfer

##### Nicolas Huc | January 6, 2014

In this blog post we will explain the concept of conjugate heat transfer and show you some of its applications. Conjugate heat transfer corresponds with the combination of heat transfer in solids and heat transfer in fluids. In solids, conduction often dominates whereas in fluids, convection usually dominates. Conjugate heat transfer is observed in many situations. For example, heat sinks are optimized to combine heat transfer by conduction in the heat sink with the convection in the surrounding fluid.

### Red Blood Cell Separation from a Flow Channel

##### Fanny Littmarck | January 3, 2014

Before conducting certain blood sample analyses, researchers need to separate the red blood cell particles from the blood plasma. Using lab-on-a-chip (LOC) technology, red blood cell separation can be achieved via magnetophoresis, i.e. motion induced by magnetic fields. Since the magnetic permeability of the particles is different from the blood plasma, their trajectory can be controlled within the flow channel of the LOC device and thereby separated out from the fluid.