Nonstandard Constraints and the Power of Weak Contributions

Temesgen Kindo October 16, 2018

Have you ever wanted to add a certain boundary or domain condition to a physics problem but couldn’t find a built-in feature? Today, we will show you how to implement nonstandard constraints using the so-called weak contributions. Weak contributions are, in fact, what the software internally uses to apply the built-in domain and boundary conditions. They provide a flexible and physics-independent way to extend the applicability of the COMSOL Multiphysics® software.

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Lipeng Liu October 12, 2018

Using the Numeric Port feature, available in the COMSOL Multiphysics® software with the add-on RF Module, the mode of a port with an arbitrary shape can be computed numerically via a boundary mode analysis. By adding a Frequency Domain or an Adaptive Frequency Sweep study, the S-Parameter and Smith plots can be obtained. The numeric port also enables us to calculate the characteristic impedance of transmission lines operating in the transverse electromagnetic (TEM) mode.

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Lauren Sansone October 11, 2018

Another year, another great COMSOL Conference Boston. Thank you to everyone who attended and contributed to the success of our annual event. Over three days last week, we were able to connect with and learn from one another…and have some fun, too!

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Caty Fairclough October 5, 2018

“Every vision is a joke until the first man accomplishes it; once realized, it becomes commonplace.” — Robert Hutchings Goddard Known as the “Father of Modern Rocketry”, Robert Hutchings Goddard was an innovator, engineer, and physicist. While Goddard made many advancements in his time, such as creating and testing the first liquid-propelled rocket on Earth, his idea of sending a rocket to the Moon was not accepted by the public. Despite this setback, Goddard continued to reach for the stars.

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Caty Fairclough October 4, 2018

Imagine that you’re indoors during a thunderstorm, watching raindrops trickle down the window. Despite the storm, you remain dry and warm thanks to the building envelope protecting you from the outside environment. To design a well-functioning building envelope, engineers need to account for a variety of different factors. Simulation can help address this need.

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Andrew Griesmer October 3, 2018

It’s here! Version 5.4 introduces a new product, COMSOL Compiler™, which enables creators of simulation applications to deploy them to users without restrictions. In addition, the latest version of the COMSOL Multiphysics® software brings enhanced usability and new physics-specific modeling features, as well as the new Composite Materials Module for modeling thin, layered structures.

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Jenn Nguyen September 30, 2018

As a hydraulics engineer, Nora Stanton Blatch Barney paved the way for women in engineering, architecture, and mathematics. Influenced by her grandmother and mother, Barney was also a key figure in the woman suffrage movement in the United States. Throughout her life and career, the courageous engineer never shied away from forging ahead and left a lasting impression on New York City infrastructure.

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Harishanker Gajendran September 27, 2018

In a previous blog series on the weak formulation, my colleague Chien Liu introduced the weak form for stationary problems and the methodology to implement it in the COMSOL Multiphysics® software. This blog post is an extension of the weak form series, showing how to solve a time-dependent problem using the Weak Form PDE interface. As you will see, not much changes in the procedure. Allow us to demonstrate…

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Jiyoun Munn September 25, 2018

When we analyze high-frequency electromagnetics problems using the finite element method (FEM), we often compute S-parameters in the frequency domain without reviewing the results in the complementary domain; that is, the time domain. The time domain is where we can find other useful information, such as time-domain reflectometry (TDR). In this blog post, we will demonstrate data conversion between two domains in order to efficiently obtain results in the desired computation domain through a fast Fourier transform (FFT) process.

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Temesgen Kindo September 21, 2018

We previously discussed how to solve 1D variational problems with the COMSOL Multiphysics® software and implement complex domain and boundary conditions using a unified constraint enforcement framework. Here, we extend the discussion to multiple dimensions, higher-order derivatives, and multiple unknowns with what we hope will be an enjoyable example: variational image denoising. We conclude this blog series on variational problems with some recommendations for further study.

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Thomas Forrister September 20, 2018

After a pleasant day at the beach, you open your car door. It’s warm inside the vehicle, but it’s nothing a little air conditioning can’t fix. Then you sit down. The seat is burning hot, making for an uncomfortable ride home. Fortunately, there’s a way to avoid this scenario: Engineers can use thermoelectric devices that leverage the Seebeck and Peltier effects to control the temperature of car seats (among other applications).

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