Analyzing Multiphase Flow in an Airlift Loop Reactor Benchmark Model

Thomas Forrister May 23, 2018

Multiphase flow involves the simultaneous flow of fluids of different phases, such as gases and liquid, or solid particles suspended in a fluid. As such, modeling multiphase flow can require multiple approaches. One approach is to use a bubbly flow model to analyze the effects of bubble-induced turbulence. Here, we discuss a benchmark model of liquid and gas flow in a water-filled airlift loop reactor and validate the simulation results with experiments.

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Thomas Forrister May 21, 2018

Gustave-Gaspard Coriolis was a French physicist with a passion for mechanics. He spent much of his time contemplating the nature of movement in machinery and introduced the concept of kinetic energy in relation to work. When he extended these ideas to rotating machinery, his sphere of influence grew: The Coriolis force and subsequent Coriolis effect are observed in rotating systems with applications in engineering, meteorology, stellar dynamics, and more.

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Caty Fairclough May 17, 2018

Mount Erebus, one of Earth’s most remote volcanoes, sits covered in snow and ice. These chilly surroundings can be misleading, as Mount Erebus has another claim to fame: It’s the most active volcano in Antarctica. One option for mapping its magma flow is with a technique called magnetotellurics (MT), which measures the electrical resistivity of Earth’s crust. To study and improve MT, engineers can analyze its performance with electromagnetics simulation.

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Bridget Paulus May 16, 2018

Thanks to their ability to “tune out” specific frequencies, electromagnetic band gaps (EBGs) are found in many different applications. EBGs can suppress unwanted electromagnetic interference (EMI) and increase electromagnetic compatibility (EMC). These structures are commonly used between nearby antennas, which can help minimize undesirable coupling and thereby enhance their performance. However, using an EBG isn’t always a guarantee for better antenna isolation. To analyze the effectiveness of an EBG, engineers can use the COMSOL Multiphysics® software and add-on RF Module.

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Ed Fontes May 15, 2018

There are four methods for modeling free liquid surfaces in the COMSOL Multiphysics® software: level set, phase field, moving mesh, and stationary free surface. In the first part of this blog series, we discuss the level set and phase field methods, which are field-based methods that describe almost any type of free liquid surface. In part two, we will compare the results from this post with those obtained using the Moving Mesh interface for solving free surface problems.

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Caty Fairclough May 13, 2018

What’s at the center of the earth? To answer this question, Inge Lehmann, a Danish geophysicist and seismologist, used seismic waves generated by earthquakes to study the middle of the planet. Her results revealed what truly lies at the center of the earth: a solid inner core inside a molten outer core.

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Brianne Costa May 11, 2018

Shape memory alloys (SMAs) are alloys with “memory”: They can return to their original shape after being deformed via a change in pressure or temperature. SMAs are used in a wide variety of applications — including metallurgy, manufacturing, biomedicine, and children’s arts and crafts — and their uses are always expanding…

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Andrew Griesmer May 10, 2018

The Application Libraries, accessed directly in the COMSOL Multiphysics® software, contain an ever-growing number of examples filled with valuable information on how to model certain types of problems, use certain features, and employ specific modeling techniques. To get the most out of the Application Libraries, you should be able to easily find the information you need.

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Brianne Costa May 9, 2018

During his life, John Scott Russell chased his passion for science — literally. While watching horses pull a boat through a shallow canal, he noticed a wave behaving strangely and followed it for one or two miles on horseback. For the rest of his life, he continued to chase this wave (which he called the “wave of translation”) figuratively, persevering even when his theories were ridiculed by scientists. Did Scott Russell ever catch up to his wave?

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Angela Straccia May 8, 2018

The lid-driven cavity is a popular problem within the field of computational fluid dynamics (CFD) for validating computational methods. While the boundary conditions are relatively simple, the flow features created are quite interesting and complex. Here, we demonstrate how to define this benchmark problem in the COMSOL Multiphysics® software. We also showcase techniques like mapped meshing and nonlinearity ramping, which can be applied to a wide variety of CFD models.

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Stuart Barnes May 7, 2018

The Ray Optics Module extends the modeling capabilities of the COMSOL Multiphysics® software to include ray tracing simulation. This module makes it possible to accomplish advanced thermal, structural, and other studies of complex optical systems in an integrated software environment. The first step in a successful simulation is the creation of the model geometry. This blog post examines how to create a complex lens geometry, using the Petzval lens as an example.

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