## Studying the Artificial Ground Freezing Method with Simulation

##### Bridget Cunningham May 18, 2017

When the German engineer F. H. Poetsch first developed the artificial ground freezing (AGF) method in 1883, he did so to avoid water within Belgian coal mines. The method, which first received praise in the late 1800s, remains similar to its original form and is still valuable today. To develop a more effective AGF method, we can turn to simulation analyses.

### How to Use the v2-f Turbulence Model in the CFD Module

##### Ed Fontes May 15, 2017

Accurately modeling turbulent flow is always a challenge with turbulence models, since they inherently involve simplifications. In addition, accurate models tend to add equations that don’t help the convergence of the already highly nonlinear models. To solve this problem, version 5.3 of the COMSOL Multiphysics® software introduces the v2-f turbulence model. It combines the accuracy obtained with models that describe the anisotropy of the turbulent boundary layers with the robustness of two-equation turbulence models.

### Modeling Natural and Forced Convection in COMSOL Multiphysics®

##### Walter Frei April 28, 2017

Whenever we have a heated or cooled part exposed to air, there is some transfer of heat from the part to the air via convection. The movement of the air can be either forced, via a fan, or free, as a result of the natural buoyancy variations due to changes in the air temperature. Today, we will look at several different ways of modeling these types of convection in the COMSOL Multiphysics® software.

### Analyzing Heat and Mass Transfer During Cake Baking with Simulation

##### Bridget Cunningham April 26, 2017

Sometimes when you bake a cake, it doesn’t turn out how you expected. Part of this is due to the underlying heat and mass transfer phenomena that occur within the baking process, which affect the end result. With tools like the COMSOL Multiphysics® software, you can study and predict how these mechanisms work and use this knowledge to bake a better cake.

### Finding an Accurate Model to Study Blood Flow Around a Stent

##### Caty Fairclough April 18, 2017

To treat cerebral aneurysms, doctors can use endovascular methods, like flow-diverting stents, that alter blood flow and reduce the risk of rupture. When studying these methods, researchers normally assume that the blood flowing around the stent is a Newtonian fluid. This might be inaccurate, since blood flow around stents is slower than normal. Using the COMSOL Multiphysics® software, researchers tested the accuracy of modeling blood flow as a Newtonian fluid by comparing it to a more realistic non-Newtonian model.

### Exploring the Effect of Greenery on Urban Air Pollution via Simulation

##### Caty Fairclough April 5, 2017

When looking to mitigate air pollution, a major health concern in many highly populated cities, one option is to use plants and greenery. Before this method can be used, it’s important to confirm that this technique is a functional strategy for improving air quality and determine the best way of implementing it. To accomplish this, researchers created a model in the COMSOL Multiphysics® software to see how different types of greenery affect pollution reduction in urban canyons.

### Predicting Deformations in a Bank Protection Structure with Simulation

##### Caty Fairclough April 3, 2017

People living near waterways can avoid the damaging effects of flooding by building embankments, which can be made safer using bank protection structures. However, factors such as soil pressure, water level fluctuation, and groundwater seepage can cause bank protection structures to deform and eventually collapse. To better understand this issue, researchers modeled a bank protection structure located within the Yangtze River in China, enabling them to predict the structure’s displacement and deformation.

### Predict the Performance of Rotating Cone Micropumps with Simulation

##### Caty Fairclough March 23, 2017

For those designing process equipment with conventional centrifugal pumps, rotating conical (or cone) micropumps may provide a simpler alternative. However, the performance of rotating cone micropumps needs further analysis, which can be difficult to achieve with only trial-and-error empirical studies. To solve this issue, researchers used the COMSOL Multiphysics® software to develop a realistic model for analyzing the fluid dynamics and performance of a rotating cone micropump. Here, we discuss their research and results.

### Understand Phenomena in the Viscous Catenary Problem via Simulation

##### Bridget Cunningham March 22, 2017

The viscous catenary problem has generated a lot of theoretical and experimental interest in recent years. This is due to the industrial importance of the rich phenomena that occur within it. Using the flexibility of the COMSOL Multiphysics® software, we can gain fundamental insights into complex problems like the viscous catenary problem and determine the validity of the assumptions made in previous analyses.

### Simulating the Electrothermal Transients in Superconducting Magnets

##### Bridget Cunningham March 9, 2017

When a superconducting magnet suddenly transitions to a normal state — known as a quench — its coils may overheat. Quench detection and protection systems are often included in the magnets to enable safer operation. For these systems to be effective, it’s important to understand the resulting electrothermal transient phenomena that take place within the magnet. Using numerical simulation, we can develop sophisticated systems that prevent possible disruption effects.

### How to Analyze Thermoelectric Cooler Designs with a COMSOL App

##### Nancy Bannach March 8, 2017

Thermoelectric coolers come in various types and sizes, including single-stage and multistage devices. Their application area is large, as they are used in both consumer products like cooling boxes and as temperature controllers in satellites. If you are looking to analyze the design of a thermoelectric cooler and optimize it for a specific application area, a simulation app is an efficient way to accomplish your goals. We discuss how to use the Thermoelectric Cooler demo app in this blog post.