Fluid

Phillip Oberdorfer | April 24, 2014

In the second part of our Geothermal Energy series, we focus on the coupled heat transport and subsurface flow processes that determine the thermal development of the subsurface due to geothermal heat production. The described processes are demonstrated in an example model of a hydrothermal doublet system.

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Clemens Ruhl | April 21, 2014

The Wall Distance interface is used to calculate the distance to a wall in the turbulent flow interfaces available in COMSOL Multiphysics. It can be combined with any other interface and comes in handy when we need to calculate the distance to the nearest wall or detect, as part of a dynamic model, when a moving object will hit a wall. Today, we will study how the Wall Distance interface works and how other interfaces can benefit from its capabilities.

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Walter Frei | April 14, 2014

One of the questions we get asked all the time is: “Can I use COMSOL Multiphysics for solving my fluid-structure interactions problems?” Of course the answer is yes, so let’s talk a little about the various fluid-structure interaction (FSI) modeling techniques. Along the way, we will introduce the add-on modules you will need for these various types of analyses.

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Nancy Bannach | April 7, 2014

Fluid flow is involved in many engineering applications. In addition to typical CFD simulations, which replace experiments in wind tunnels, flow must also be considered in the cooling of electronic devices or in the chemical industry, where reacting species are transported by a fluid. COMSOL Multiphysics offers dedicated interfaces for various flow types. When should we use the Laminar Flow or Turbulent Flow interface?

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Amelia Halliday | April 1, 2014

The Leaning Tower of Pisa is regarded as one of the most famous landmarks in the world, although geotechnical engineers probably view it more as a construction gaffe. To prevent such a leaning fate, it could be useful to run an analysis in order to predict possible subsidence due to poroelastic deformation.

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Phillip Oberdorfer | March 28, 2014

In this first entry of our new Geothermal Energy series, we introduce the concept of modeling geothermal processes and the many physical phenomena involved. We also show you an example model of a borehole heat exchanger.

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Valerio Marra | March 18, 2014

What do heated soap bubbles, wavy clouds, and Jupiter’s Great Red Spot have in common? Their formation depends on the dynamics of the shear layer existing between two parallel streams moving at different velocities. This unstable motion, called Kelvin-Helmholtz instability, is ubiquitous and plays an important role in the dynamics of climate, for example. Let’s take a closer look at the onset and evolution of this instability with the help of Computational Fluid Dynamics (CFD) analysis.

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Ahsan Munir | February 26, 2014

DNA is a complex molecule that contains instructions for life and often referred to as a “digital fingerprint” or code telling a cell what to do. DNA is often the only means for accurate testing and identification of biomolecules, cells, or even an entire person during forensic investigations. The need to be able to test for DNA, as quickly as possible, and even at the site where the sample is taken, is becoming more and more important.

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Andrew Griesmer | February 25, 2014

A circulating fluidized bed (CFB) is used to create a homogeneous mixture of gas (usually air) and solid particles to increase the efficiency of the combustion process in boilers. A better understanding of this process will help engineers to optimize their design parameters based on their individual needs. The Circulating Fluidized Bed model in COMSOL does just this, simulating a CFB with a given set of parameters that are easily interchangeable, depending on the needs of the user.

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Alexandra Foley | January 27, 2014

There are, in general, two different types of ventilation systems: mixing ventilation and displacement ventilation. Displacement ventilation is used in large spaces with tall ceilings (at least three meters high), and therefore is mainly found in office buildings, schools, and other public spaces. These higher ceilings allow for upward convective flows exhausting air contaminants, thus resulting in improved air quality. This post explores the simulation of a displacement ventilation system to determine the air temperature and velocity within a room.

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Mark Fowler | January 24, 2014

Mixers with rotating components are essential in many industrial applications, including food production, manufacturing chemicals, pharmaceuticals, and other consumer products. While the industrial processes of mixers differ, product requirements like quality, reproducibility, and uniformity must remain constant. Using the Mixer Module is one way you can make sure these product requirements are met. In our upcoming webinar, you’ll learn how the fluid flow interfaces available in the Mixer Module allow you to streamline the design of mixers and their mechanisms.

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