How to Place Inlet and Outlet Boundary Conditions in CFD Simulations

Mats Nigam August 20, 2018

When setting up fluid flow simulations, we typically focus on a single (possibly a few) components in a larger system, such as a pump or sedimentation tank in a water treatment plant. Naturally, this raises a question: At what distance can we apply boundary conditions without interfering with the process? In this blog post, we look at the effects of the proximity of inlet and outlet boundaries for interior and exterior flows of a homogeneous fluid with negligible compressibility.

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Thomas Forrister August 17, 2018

“If you want to find the secrets of the universe, think in terms of energy, frequency, and vibration.” — Nikola Tesla Can we “see” sound? Not directly, but we can come close. By changing our perspective, we can learn a lot about the nature of acoustics. One way to observe acoustics phenomena is by studying standing waves in a solid medium known as a Chladni plate. A special technique creates patterns on the plate that reveal sound’s physical nature.

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Brianne Costa August 14, 2018

If you ever visit the extravagant dome within St. Paul’s Cathedral in London, be careful what you say. As Lord Rayleigh discovered circa 1878, the vaulted structure exhibits an interesting acoustics phenomenon: Whispers from one part of the dome can be clearly heard in other areas. Rayleigh called the effect a “whispering gallery”. Surprisingly, you can observe a similar effect in another field of science entirely: light waves traveling in an optical ring resonator.

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Caty Fairclough August 13, 2018

Contributing to the development of a famous fluid dynamics equation, naming the phenomenon of fluorescence, and advancing the field of geodesy: These are a few of the many accomplishments of Irish physicist and mathematician Sir George Gabriel Stokes…

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Caty Fairclough August 9, 2018

Electrically erasable programmable read-only memory (EEPROM) is a type of nonvolatile memory that enables users to repeatedly store and erase small amounts of data by applying a voltage pulse. EEPROM is often used as a storage medium in computers and mobile devices and has applications in devices like microcontrollers. To analyze the designs of EEPROM devices, engineers can turn to semiconductor simulation.

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Thomas Forrister August 8, 2018

Paul Dirac was a theoretical physicist who laid the foundations for quantum theory as we now know it. He was highly motivated by the pursuit of mathematical beauty, and his calculations led him to predict the existence of antimatter and reconcile special relativity with quantum mechanics. Regarded as the founder of quantum electrodynamics, Dirac played an important role in the development of atomic theory for the 20th century and beyond.

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Bridget Paulus August 6, 2018

Efficient, cost effective, and environmentally friendly, friction stir welding (FSW) is useful for many applications. As the name implies, this process involves using friction to heat materials and then stirring them together. For optimal FSW performance, the generated heat has to be just the right temperature: Too high and the materials melt, weakening the weld; too little and the process is inefficient. Using the COMSOL® software, you can evaluate and improve heat transfer in the FSW process.

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Thomas Forrister August 1, 2018

Considered the “Father of Nuclear Medicine”, George de Hevesy was a radiochemist who was just as interested in chemical processes as he was in their outcomes. Among his many discoveries, de Hevesy is best known for expanding the applications of X-ray florescence and using radioactive isotopes as tracers to study chemical processes. He also helped discover a chemical element and cofounded the field of radioactivation analysis.

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Brianne Costa July 31, 2018

The Oldroyd-B numerical model defines flow in fluids that exhibit complex viscoelastic behavior under strain, such as clay, toothpaste, oil, and polymer solutions. In a benchmark model of an Oldroyd-B fluid, the COMSOL Multiphysics® software and add-on CFD Module are used to solve the numerical model, the results of which have been validated by published research.

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Bridget Paulus July 30, 2018

From home HVAC systems to spacecraft ejectors, diffusers find use in all kinds of applications. For example, diffusers are often used in supersonic aircraft like ramjets to slow down fluid flow and increase static pressure. To design transonic diffusers for supersonic applications, engineers must account for factors like high-speed turbulent flow and shock waves. As this benchmark model illustrates, these complex phenomena can be accurately analyzed using the COMSOL® software.

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Caty Fairclough July 25, 2018

Rosalind Franklin knew that she wanted to pursue a career in science from a young age. This ambition led her to become a chemist and X-ray crystallographer. Her work in these roles helped to advance how we understand the inner workings of DNA, the study of virology, and more.

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