How to Model Fundamental Sources in Enclosed Spaces

James Gaffney January 17, 2019

As the story goes, Archimedes was struggling with a case of suspected golden crown fraud. Whilst taking a bath, inspiration hit: Submerging an object displaces the same amount of water as the object’s volume, so he could expose any dilutions to the gold. Archimedes was so pleased, he yelled “eureka!” But would anyone have heard the now-famous shout? Using simulation, we can evaluate the acoustics of resonant and reverberant enclosed spaces, like bathrooms, and how they respond to fundamental sources.

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Erik Melin January 16, 2019

The goal of mesh adaptation is to modify the mesh to solve a problem more efficiently. We want to use as few elements as possible to obtain an accurate solution. Typically, we would like a coarser mesh in regions that are not very important and a more refined mesh in regions of interest. We might even consider anisotropic elements. As of version 5.4, the COMSOL Multiphysics® software includes enhanced tools to adapt a mesh. Let’s take a look.

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Bridget Paulus January 14, 2019

How can teachers improve student learning in undergraduate science, technology, engineering, and mathematics (STEM) courses? To find out, Ivana Milanovic, a professor at the University of Hartford, developed a simulation-based approach that combines problem-based learning (PBL) and inquiry-based learning (IBL). Milanovic discussed her strategy and its benefits during her keynote talk at the COMSOL Conference 2018 Boston. Below, you can find a summary and video recording of her presentation.

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Bridget Paulus January 11, 2019

From blood pressure sensors to electronic money cards, planar coils are widely used. Found on circuit boards, these coils are a good choice for inductive coupling, especially when space is limited. When designing these coils, it’s important to calculate both their inductance and resistance, as these factors play a key role in the device’s performance. To do just that, engineers can use layered shell functionality in the COMSOL® software, which enables them to model all coils on one plane.

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Prashant Srivastava January 9, 2019

Various machinery, such as engines, pumps, and turbines, employ components that transmit the load between the solid parts that are in relative motion. Common examples are piston rings, cams, gear teeth, and (of course) bearings. Often, these components are lubricated by maintaining an oil film between the two solid parts to minimize the friction and wear. In this blog post, we look at methods for modeling the fluid friction in lubricated joints.

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Brianne Costa January 8, 2019

It’s safe to say that Stephen Hawking is one of the most influential and highly regarded theoretical physicists in history. Besides contributing to the fields of astronomy and cosmology, Hawking inspired multiple generations with a curiosity for space exploration and a love of physics.

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Mark Robins January 7, 2019

In a previous blog post, we explored whether U.S. copyright law protects scientific models. That post concluded that models, alone, are frequently incapable of reflecting the type of creative expression required to be eligible for protection but also noted that functionality added to models — as occurs when building applications — may well contain such creative expression. Here, we explore the tools that COMSOL offers to help users of the COMSOL Multiphysics® software to publish and protect their proprietary applications.

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Kristian Ejlebjærg Jensen January 4, 2019

Engineers are given significant freedom in their pursuit for lightweight structural components in airplanes and space applications, so it makes sense to use methods that can exploit this freedom, making topology optimization a popular choice in the early design phase. This method often requires regularization and special interpolation functions to get meaningful designs, which can be a nuisance to both new and experienced users. To simplify the solution of topology optimization problems, the COMSOL® software contains a density topology feature.

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Emily Ediger January 1, 2019

Whether you refer to it on a daily basis or it brings up memories of a middle school chemistry class, the periodic table of elements is a household name. The United Nations has even named 2019 as the International Year of The Periodic Table of Chemical Elements. Today, we discuss the history of the periodic table of elements as well as why it is being celebrated for an entire year…

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Bridget Paulus December 31, 2018

An air ambulance flies overhead, speeding toward a hospital with a life-saving treatment. This “treatment” isn’t a new medicine or machine but an organ on its way to a patient on a transplant list. To keep the organ at just the right temperature during transport, it’s placed inside a special container called a cold or isothermal box. By using simulation, you can analyze the design of these boxes, making sure that they’re reliable for their life-saving purpose.

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Chien Liu December 27, 2018

Carrier dynamics plays an important role in the transient behavior and frequency response of semiconductor devices. Here, we use two tutorial models of PIN rectifiers in the Semiconductor Module, an add-on to the COMSOL Multiphysics® software, to demonstrate the simulation of dynamical effects.

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