## How to Reuse a Deformed Shape as a Geometry Input

##### Temesgen Kindo September 1, 2016

Suppose you take a piece of metal — a thin sheet, for example — and apply some mechanical loads. The metal will deform and take on a new shape that differs from the original undeformed configuration. Say you now want to use this deformed object as part of a new geometry construction. You can then solve another physics problem on the new composite domain. Today, we’ll demonstrate how to use a deformed object as an input to a geometry sequence.

### Studying Bioreactor Landfills to Solve a Growing Trash Problem

##### Caty Fairclough August 26, 2016

Around the world, trash is added to landfills at an increasingly rapid rate. Since these landfills take up large areas of land and can cause environmental issues, researchers are looking for safer, space-saving solutions. One option is to convert traditional anaerobic landfills into aerobic bioreactor landfills. This conversion process needs to be studied further, which could take years experimentally. For faster results, researchers at the University of Western Ontario used the COMSOL Multiphysics® software to efficiently analyze this process.

### Compressibility Options and Buoyancy Forces for Flow Simulations

##### Beatrice Carasi August 22, 2016

The numerical analysis of fluid flow and temperature fields can offer valuable insight in many engineering applications. Efficiency, of course, is important when performing such simulations. Here, we’ll discuss the various formulations for fluid flow equations in the COMSOL Multiphysics® simulation software and when it’s best to use each option, paying particular attention to how this selection influences heat transfer analyses. We will also cover how to set up both natural and forced convection simulations using these formulations.

### How to Build Gear Geometries in the Multibody Dynamics Module

##### Pawan Soami August 17, 2016

Realistic gear geometries are useful for multibody dynamics simulations when coupled with other physical phenomena. Rather than manually building these geometries, we can use built-in parts available in the Part Library. With these highly parameterized gear parts, we can build a wide range of parallel and planetary gear trains and learn how to use different aspects of the built-in parts to create a realistic gear model in the Multibody Dynamics Module.

### Optimizing the Hydration Operation in the Thermal Processing of Dates

##### Bridget Cunningham August 16, 2016

Like many crops, the quality of dates is heavily impacted by agronomic practices. In Tunisia, for example, such elements have caused these soft edible fruits to become drier in nature. One approach to improving the quality of these dates is thermal processing, where the key unit of operation is hydration. Combining the power of experimental studies with simulation analyses, a team of researchers sought to optimize the hydration process in order to foster greater efficiency and reliability.

### Design an App to Efficiently Model the Flash Method Procedure

##### Peng-Chhay Ung August 15, 2016

The flash method, first described by W.J. Parker et. al in 1961, is a widely used technique for measuring the thermal conductivity of materials. Our Flash Method demo app, highlighted here, performs a numerical simulation of this experiment, offering a simplified approach to modifying parameters that can impact its overall accuracy. Today, we’ll take a closer look at this easy-to-use app, as well as the theory behind it.

### How to Model Contact Fatigue in COMSOL Multiphysics®

##### Mateusz Stec August 4, 2016

Damage occurs in bearings, gears, rails, and cams due to a damage mechanism called contact fatigue. This happens in assemblies when two parts in contact experience a time-dependent contact pressure. When the transferred load is too high, and after numerous load cycles, a piece of the surface material can flake off and leave a small crater. This phenomenon is called spalling or pitting. With the COMSOL Multiphysics® software, we can model contact fatigue and predict failure in these components.

### Evaluating Microphones and Transducers with Simulation

##### Aditi Karandikar August 2, 2016

Acoustic measurements aren’t always accurate due to imperfections in the measurement tools. To limit incorrect results, devices, such as microphones and vibration transducers, have standards that define their allowable margin of error. Meeting these standards is required, but good measurement tools go a step further and keep their error range consistent over time. To create quality devices, research teams at Brüel & Kjær use multiphysics simulation to model their microphone and transducer designs.

### Using Apps to Optimize Induction Heating for Food Processing

##### Abbie Weingaertner August 1, 2016

Modern food processing techniques are constantly being analyzed and improved. To evaluate the efficiency of such techniques and the equipment that they utilize, researchers and engineers can turn to simulation tools like COMSOL Multiphysics. Numerical modeling apps are helping to bring this simulation power to a wider audience, accelerating the optimization of such processes along the way. Let’s see how this applies to the analysis of induction heating for food processing.

### How to Model Adhesion and Decohesion in COMSOL Multiphysics

##### Henrik Sönnerlind July 28, 2016

In the latest version of COMSOL Multiphysics® — version 5.2a — we bring you new features designed to enhance your structural mechanics contact modeling. You can, for instance, simulate objects that stick together once they come in contact (adhesion) as well as those that pull apart (decohesion), including full cohesive-zone modeling. Learn how to address each of these scenarios using the new functionality in COMSOL Multiphysics.

### Evaluating an Insulin Micropump Design for Treating Diabetes

##### Bridget Cunningham July 21, 2016

In any form of treatment, it is always desirable to minimize the level of discomfort that the treatment process causes patients, while ensuring overall safety and effectiveness. For diabetes patients, insulin injections remain an important form of treatment, but the process itself can be painful. With the help of multiphysics simulation, a team of researchers from the University of Ontario Institute of Technology sought to develop a MEMS-based micropump that could administer insulin injections in a safe and painless way.