Happy Birthday, Hendrik Lorentz

Thomas Forrister July 18, 2018

Hendrik Lorentz was a Dutch physicist who clarified the concept of the electron within an atom and theorized the connection between electricity, magnetism, and light. Not only did Lorentz win the Nobel Prize for his work in electron theory, he also illuminated the path to other branches of theoretical physics, including quantum mechanics as well as general and special relativity.

Read More

Categories

Nathan Martin July 17, 2018

Following up on a previous blog post about glacier flow modeling, we are going to delve a bit further into a crucial component of geophysics modeling in general: parameterizing numerical models using observations. Let’s see how we can quantify sensitivity and infer unknown parameters through indirect observations using the COMSOL Multiphysics® software and add-on Optimization Module.

Read More

Caty Fairclough July 13, 2018

Circulators are a bit like traffic circles (also known as rotaries or roundabouts), where motion occurs in one direction only and each pathway doubles as an entrance and exit. In a circulator, however, the microwave signal always exits at the next available port. This characteristic makes circulators useful for applications that involve coupling transmitters and receivers to common antennas. To ensure that circulators function successfully, electrical engineers can study their designs with electromagnetics simulation.

Read More

Categories

Brianne Costa July 11, 2018

The word “turbocharged” is often used colloquially to describe increased speed, such as “turbocharged” coffee that energizes you faster than a regular cup of joe. Actual turbochargers also increase speed, but in combustion engines instead of your morning mug. Turbochargers operate via turbine-driven forced induction and often rely on hydrodynamic bearings for support. However, these bearings naturally include cross-bearing forces that cause negative damping and system failure. Using rotordynamics modeling, you can analyze how these forces affect turbocharger designs.

Read More

Jenn Nguyen July 9, 2018

Jacob Perkins, also known as the “Father of the Refrigerator”, had a wide range of interests that extended further than the common household appliance. This mechanical inventor had 21 American and 19 English patents, which is no surprise, given his curiosity and ingenuity. Let’s take a moment to appreciate a few of Perkins’ major contributions…

Read More

Categories

Guest Bojan Jokanović July 5, 2018

Guest blogger Bojan Jokanović of SGL Carbon GmbH, one of the world’s leading manufacturers of carbon-based products, discusses the optimization of thermal processes in the carbon industry. Carbon products are used in many industries, including semiconductors, car manufacturing, ceramics, and metallurgy. Properties of graphite including high-temperature stability, good thermal and electric conducting behavior, and high chemical stability make this material unique. However, carbon manufacturing is an energy-intensive industry. We must build digital process chains to optimize processes and minimize costs.

Read More

Brianne Costa July 4, 2018

Multijet tubular reactors are used to manufacture polymers such as polyester. The turbulent flow that occurs in this type of reactor can affect the manufacturing process, including the reaction kinetics, fiber quality, conversion, and yield. By developing a reactor model that fully takes into account both the fluid dynamics and chemical reactions, you can optimize a reactor design for efficient and reliable polymer production.

Read More

Thomas Forrister July 3, 2018

In electrochemistry, it’s common to use a microdisk as the working electrode in an analytical technique known as cyclic voltammetry. However, unlike with a macroelectrode, diffusion at a microelectrode occurs very fast on the timescale of the experiment. To simplify the analysis, we can use an approximation that assumes the microdisk has stationary diffusion properties on the timescale of the voltammetry study — eliminating the need for a time-dependent model.

Read More

Brianne Costa July 2, 2018

What do beer fermentation, soil analysis, and the production of dairy products have in common? They all involve the use of ion-sensitive field-effect transistors (ISFETs) for pH measurement. These sensors are small, efficient, and durable, which makes them suitable for food, environmental, and biomedical applications. However, ISFETs can experience drift and are sensitive to different temperatures, which limits their accuracy and stability. Using the COMSOL® software, engineers can accurately analyze ISFET designs and improve their performance.

Read More

Kateryna Vyshenska June 28, 2018

Say you want to compute thermal expansion and stresses in an object. You provide the heat fluxes and temperature constraints on the boundaries, compute, and get a convergence error. Often, this result comes from a lack of displacement constraints. However, it is not trivial to provide constraints that do not induce artificial stresses. Today, we showcase the Rigid Motion Suppression feature in the COMSOL Multiphysics® software, which you can use to automatically figure out the constraints you need.

Read More

Thomas Forrister June 27, 2018

Batch reactors are used to manufacture a wide variety of products in the fine chemical, pharmaceutical, and food industries. In some cases, fine chemical processing may require more consistent operating conditions than batch reactors can offer, and continuous plate reactors may then provide better control of the process. Chemical modeling can help in the design of continuous plate reactors that are optimized for thermal control and product purity.

Read More


Categories


Tags

1 2 3 119