# COMSOL Blog

## Can We Hear the Shape of a Drum?

##### Chien Liu | April 1, 2015

Over half a century ago, Mark Kac gave an interesting lecture on a question that he had heard from Professor Bochner ten years earlier: “Can one hear the shape of a drum?” He focused on the (then undetermined) uniqueness of the set of eigenvalues given the shape of a vibrating membrane. The eigenvalue problem has since been solved and here we explore the “hearing” part of the question by considering some interesting physical effects.

### Simulating the Insertion of a Snap Hook

##### Bridget Cunningham | March 31, 2015

Commonly used in the automotive industry, snap hooks are a type of fastener that involve the insertion of a hook into a slot. When designing snap hooks, it is important to analyze the forces required for the insertion of the hook as well as its removal. We can address this through simulation.

### Instability in Portable Washing Machines

##### Caty Fairclough | March 30, 2015

Lightweight and portable washing machines are great to use in situations where you do not have access to traditional washing machines. Yet problems may occur when a varied distribution of clothing causes walking instability in these machines. We tested for walking instability during the spin cycle of a portable washing machine and used an active balancing method in an attempt to remove this instability.

### Improving Your Meshing with Partitioning

##### Walter Frei | March 27, 2015

Often, the most tedious step of finite element modeling is subdividing your CAD geometry into a finite element mesh. This step, usually just called meshing, can sometimes be fully automated. More often, however, the careful finite element analyst will want to semi-manually create their meshes. Although this does require more work, sometimes there are significant advantages in doing so. In this blog entry, we will look at one of the key manual meshing techniques: the concept of geometric partitioning.

### Vivaldi Antenna Design Analysis

##### Caty Fairclough | March 25, 2015

The Vivaldi antenna, also known as the tapered slot antenna (TSA), is an ideal antenna for wide-band applications. It stands out due to its uncomplicated structure, simple manufacturing requirements, and high gain. When working on a Vivaldi antenna design, we can use simulation software to evaluate its far-field pattern and impedance.

### Tears of Wine and the Marangoni Effect

##### Brianne Costa | March 24, 2015

Try pouring some wine into a glass. Don’t drink it yet — this is a scientific experiment. When you hold up your glass, you’ll see what look like teardrops running down the sides. These tears of wine are caused by the Marangoni effect, which describes a mass transfer along the surface of two fluid phases caused by surface tension gradients along the interface between the two phases (for example liquid and vapor).

### Simulating Injection Mold Cooling

##### Brianne Costa | March 23, 2015

Behind the wheel of a car is not the ideal place to discover that the steering wheel is defective. That’s why special precautions are taken during the manufacturing process. The carefully controlled cooling of an injection mold ensures that whatever the product may be, its standards are up to par. Here, we use the Non-Isothermal Pipe Flow interface with the Heat Transfer in Solids interface to study the cooling path of an injection mold for a polyurethane car steering wheel.

### Modeling with Linearly Polarized Plane Waves

##### Bridget Cunningham | March 20, 2015

COMSOL Multiphysics version 5.0 introduced users to a new background field feature designed for linearly polarized plane waves. Explore the use of this new feature with an example of polarization-dependent scattering from our Model Gallery.

### Curve Fitting of Experimental Data with COMSOL Multiphysics

##### Walter Frei | March 19, 2015

We often need to work with experimental data in COMSOL Multiphysics, usually to represent material properties or other inputs to our model. However, experimental data is often noisy; it contains experimental errors that we do not want to introduce into our simulations. In this blog post, we will look at how to fit smooth curves and surfaces to experimental data using the core functionality of COMSOL Multiphysics.

### COMSOL Multiphysics Wins 2014 Product of the Year Award

##### Bridget Cunningham | March 18, 2015

COMSOL Multiphysics was awarded the 2014 NASA Tech Briefs‘ Readers’ Choice Product of the Year, just a month after winning NASA Tech Briefs‘ Product of the Month in December 2014. Learn more about this award and how it reflects the influence of COMSOL Multiphysics in the future of design engineering.

#### Categories

##### Caty Fairclough | March 17, 2015

Want to share your simulations with the world or simply your own team? After you build an application with the Application Builder in the COMSOL Multiphysics® software, you can share your app using a COMSOL Server™ license with anyone from colleagues to customers. Here is your introduction to COMSOL Server™ — what it is, why to use it, and a brief overview of how to get started.

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