Modeling Linear Motors or Generators in COMSOL Multiphysics

Nirmal Paudel | October 6, 2015

The Rotating Machinery, Magnetic physics interface available in the AC/DC Module is used to model rotating machines such as motors or generators. When modeling the linear or tubular device with the Magnetic Fields and the Moving Mesh physics interfaces, it is appropriate to use a customized linear periodic boundary condition. In this blog post, we will explore how to customize the linear periodic boundary condition and model the tubular generator that is used for wave energy.


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Temesgen Kindo | October 5, 2015

Previously on the blog, we introduced you to Linear Extrusion operators and demonstrated their use in mapping variables between a source and a destination. This approach, as explained earlier, is limited to cases in which the source and destination are related by affine transformations. Today, we will discuss General Extrusion operators, which are designed to handle nonlinear mappings and the mapping of variables between geometric entities of different dimensions.


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Mads Herring Jensen | October 1, 2015

This past July, I had the pleasure of attending the 22nd International Congress on Sound and Vibration. In addition to running the COMSOL vendor booth with my Italian colleague Gabriele, I was also a presenter at the event. My presentation was based on a paper I wrote with Henrik Bruus and Jonas Karlsen that focuses on how to determine acoustic radiation forces including thermoviscous effects. Let’s explore acoustophoretic effects in greater detail and the research findings highlighted in my presentation.


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Bridget Cunningham | September 25, 2015

Göttingen, Germany, a city located in the valley of the Leine River, is home to one of our COMSOL branch offices. Recognized as a university town, the city features a vibrant and youthful atmosphere, with an emphasis on freedom in scientific research and exploration. Let’s take a closer look at the history of Göttingen’s prestigious university — the University of Göttingen — and learn more about the character and feel of the city.


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Benjamin Loubet | September 23, 2015

Think about the first architects who designed a bridge above water. The design process likely included several trials and subsequent failures before they could safely allow people to cross the river. COMSOL Multiphysics and the Optimization Module would have helped make this process much simpler, if they had computers at the time, of course. Before we start to discuss building and optimizing bridges, let’s first identify the best design for a simple beam with the help of topology optimization.


Andrew Griesmer | September 18, 2015

If you are in the process of learning how to build simulation apps, the video shown here is a fantastic introduction to writing methods. With a fully functioning app already built, we create a method with the click of a button and then proceed to play a sound, include user inputs, and add an if-else statement. All of this is done using Language Elements, which are included in the Method Editor to help make creating methods a breeze.


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Bridget Cunningham | October 2, 2015

Over the years, energy harvesting has become a popular approach to power small wireless devices. For energy harvesters to yield optimal results, it is important that their design configurations maximize the level of power transfer. Here, we will explore the role of simulation in advancing the design of a piezoelectric energy harvester.


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Temesgen Kindo | September 29, 2015

In many simulation tasks, it is necessary to transfer variables from one region of a computation domain (the source) to another region or component (the destination). In COMSOL Multiphysics, this functionality is achieved by defining a point-to-point map, called an extrusion operator, that relates a set of destination points with a set of source points. Once a mapping is established by an extrusion operator, all variables defined at the source can be accessed from the destination using the same operator.


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Pankaj Nerikar | September 24, 2015

In an operating nuclear reactor, complex and highly coupled physical phenomena occur. Analyzing such phenomena within these devices by conducting physical experiments is often difficult and sometimes impossible. Simulation offers a simplified approach to studying and optimizing nuclear reactor designs, saving time, money, and other resources.


Brianne Costa | September 22, 2015

The Application Builder and the COMSOL Server™ license have changed the way simulation engineers develop a project — from research and design to testing and development. If you are wondering how you can use these tools for your own modeling needs, read our list of seven use cases for the Application Builder and COMSOL Server™.


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Aditi Karandikar | September 16, 2015

Do you drool at the very mention of chocolate? If so, you’re a “chocoholic” like me, and Nestlé’s Kit Kat® bar is one of my favorites. For 80 years, people around the globe have devoured this four-piece delight. To ensure every bar of chocolate produced has the same consistency, texture, and taste, the engineers at Nestlé’s Product Technology Centre in York, UK (PTC York) are using simulation to optimize the Kit Kat® bar manufacturing process.


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