New Impedance Boundary Conditions for Acoustics Simulations

Søren Vedel | December 3, 2015

When developing a new product or functionality, the first step is typically to understand the functional properties in isolation. To achieve reliable and accurate predictions via mathematical modeling, it is essential that the critical components, test setup, and boundary conditions are specified in great detail. Most engineers, however, would prefer to focus on the critical components rather than “irrelevant” boundary conditions. New impedance boundary conditions in the Acoustics Module of COMSOL Multiphysics help to close this gap.

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Fanny Littmarck | December 2, 2015

Healthcare-associated infections (HAI) affect millions of people around the globe. While the most common cause of HAI is direct contact with the source, airborne bacteria may also play a role in patient infections. To prevent airborne infection and make hospital clean rooms safer, it’s important to design efficient ventilation systems. As an added benefit, efficient ventilation designs also lead to lower energy-related costs. The first step to a better design is CFD modeling.

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Deepa Krishna | November 30, 2015

Just a few weeks ago, the COMSOL Conference — the premier event for multiphysics simulation — made a stop in Pune, India. Around 270 attendees gathered for the two-day conference, which included more than 25 training courses, along with user presentations, industry talks, and panel discussions. Take a look at this collection of photos from the event.

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Ed Fontes | November 25, 2015

During the discharge of a battery, the current in the circuit flows from the positive to the negative electrode. According to Ohm’s law, this means that the current is proportional to the electric field, which says that current flows from a positive to negative electric potential. But what happens inside the battery? Does the current flow from negative to positive electric potential? This blog post explains the potential profile inside a battery during discharge and recharge.

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Brianne Costa | November 23, 2015

At the COMSOL Conference 2015 Boston, Jeff Crompton from AltaSim Technologies — a COMSOL Certified Consultant — spoke about building, sharing, and deploying apps and what this means for the future of simulation. The team at AltaSim develops apps for a variety of purposes, from analyzing power electronics to additive manufacturing technologies. While some apps are deployed for commercial use, others are customized to meet the specific needs of companies. See how AltaSim is making simulation more accessible with apps.

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Walter Frei | November 18, 2015

When solving a chemical species transport problem, we are often dealing with cases that have a high Péclet number, where the ratio of the advection to diffusion is very high. We may also be dealing with such problems in structures that are periodic along the flow direction, and where the flow field itself is periodic. Using COMSOL Multiphysics, we can greatly reduce our computational requirements for such problems by using General Extrusion component couplings and the Previous Solution operator.

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Ed Gonzalez | December 1, 2015

In structural mechanics, you may want to specify user-defined material models in your simulation. COMSOL Multiphysics® software version 5.2 enables you to access material models derived from external libraries as well as material functions programmed by yourself. We demonstrate how the new functionality works with the example of implementing Mazars’ model to describe damage to concrete.

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Brianne Costa | November 26, 2015

Locating and removing landmines and other improvised explosive devices (IEDs) is an important yet challenging task, especially with new advancements in cloaking technology. Using COMSOL Multiphysics® software, one team of researchers studied electromagnetic detection for subsurface objects to better understand the technique and improve its accuracy.

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Bridget Cunningham | November 24, 2015

At the COMSOL Conference 2015 Grenoble, attendees had the opportunity to learn about a variety of innovative research involving COMSOL Multiphysics. During the industry talks, keynote speakers from four companies — ArcelorMittal Global R&D, ABB, B&C Speakers, and CHLOE — took the stage to share their stories. Take a closer look at this interesting mix of multiphysics applications.

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Daniel Smith | November 19, 2015

Many different tools are available for counting particles. Choosing the optimal method depends on the application; specifically, whether you want to use the number of counted particles in equations or during postprocessing. The Particle Tracing interfaces in COMSOL Multiphysics feature three main particle counting options. While these approaches are versatile enough to compute quantities such as charge density and momentum flux, our focus here will be computing the number of particles on a set of domains or boundaries.

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Nandita Roche | November 17, 2015

For the first time, the COMSOL Conference made a stop in Pune for a two-day simulation event. Attendees came from all over India to present work in a wide range of applications. The conference saw over 100 user presentations in the form of posters and oral sessions. Let’s review the award-winning papers and posters from the COMSOL Conference 2015 Pune.

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