Bridget Cunningham | September 1, 2015

An important element in the design of any simulation app is organization. Maintaining an orderly structure makes it easier for you to build the app and also enhances the usability experience for app users. Today, we will show you how to create organized apps in COMSOL Multiphysics with the help of subforms and form collections.

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Caty Fairclough | August 31, 2015

Adjusting the focal length of a camera lens allows you to change your angle of view. Miniature lenses can achieve this change by using a method called electrowetting. Electrowetting involves changing the balance of forces at a contact point of a free surface and a solid by applying a voltage. However, focus is not obtained immediately due to oscillations in the free surface. Here, we investigate the optimal viscosity for critically damping the free surface when a voltage is applied.

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Fabio Bocchi | August 27, 2015

Each year, tennis players from around the world compete at the U.S. Open, one of the oldest and largest tennis tournaments. With the 2015 tournament approaching, I found myself reflecting on my own experiences playing tennis, particularly how the feeling you get after hitting the ball is never quite the same. Is this simply a figment of the imagination or is there a physical answer? As I will explain here, so-called “sweet spots” can account for this feeling.

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Bridget Cunningham | August 26, 2015

Polymerase chain reaction tests have many applications within medical and biological research. In the past, these tests have been performed within a laboratory setting due to their high power requirements and the slow speed at which results are delivered. Researchers at the University of California, Berkeley have developed a new LED-based polymerase chain reaction system that, with its simplicity and speed, could be used in point-of-care testing.

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Andrew Griesmer | August 25, 2015

When a user running your COMSOL app finds a particularly interesting set of results, they might need to save their app so they can come back to it later. Without save options, you’d have to re-run the simulation later with the input parameters they gave you. That would be very inefficient and defeat the purpose of creating simulation apps. Today, we’ll show you how to add a file menu with save options in your app.

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Chien Liu | August 24, 2015

Today we continue our discussion on the weak formulation by looking at how to implement a point source with the weak form. A point source is a useful tool for idealizing the situation where a source is concentrated in a very small region of the modeling domain. We will find that it is very convenient to set up such a point source using the weak form.

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Brianne Costa | August 20, 2015

We sometimes hear of tourists getting into trouble for carving their initials into the walls of the Coliseum in Rome and other famous structures. However, the more serious damage to this architecture is caused by something else entirely — salt. Transported by wind and water droplets, and even found in some building materials, salt is a powerful mineral that can cause a building’s façade to crumble and break. Researchers studied this effect to better predict salt’s behavior and prevent damage.

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Brianne Costa | August 19, 2015

Have you ever noticed that being around a happy, enthusiastic friend makes you feel happy too? You can look at mutual induction in a similar way: A current flowing through one circuit creates a current in a nearby circuit. Mutual inductance measures the amount of change required for this effect to take place. Here, we explore using simulation to compute the mutual inductance in different wire coil arrangements.

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Andrew Griesmer | August 18, 2015

The Application Builder is an easy-to-use tool built into COMSOL Multiphysics. After watching the 10-minute video below, you will know how to build a functioning app from a model — and be on your way to building your own customized simulation apps.

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Caty Fairclough | August 17, 2015

Many aquatic vehicles use power-hungry active sensing methods to detect and identify objects within an oceanic environment. In order to find an energy-efficient alternative, a team of researchers from the PSG College of Technology in India used numerical simulation to investigate a pressure sensor design inspired by a blind cave fish. In this blog post, we’ll take a closer look at this passive MEMS-based pressure sensor.

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Bridget Cunningham | August 13, 2015

Diffraction gratings are often used as a tool for bending and spreading light in optical instruments. Analyzing the diffraction efficiency of such optical components is important, as this can affect the instrument’s performance. Simulation offers an efficient way for testing various grating designs to achieve an optimal configuration. By creating a simulation app, you can further expedite this process, extending simulation capabilities to a wider audience. Our Plasmonic Wire Grating Analyzer demo app highlights this approach.

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