## Reduce the Fan Noise of a Turbofan Aeroengine with Simulation

##### Caty Fairclough September 26, 2016

The fans in an airplane’s turbofan engine are one of its main sources of noise. In excess, this can cause a range of health problems, including hearing impairment, sleep disturbance, and stress-related illnesses. To optimize the design of turbofan engines to reduce noise pollution and its correlating side effects, you can turn to acoustic modeling. Our jet pipe tutorial model speaks to the benefits of using such an approach.

### Rotordynamics Fosters the Design of Reliable Rotating Machines

##### Caty Fairclough September 8, 2016

Rotating machinery is an important element in many structures, from wind turbines to engines. The analysis of this rotating machinery — a field known as rotordynamics — is key in reducing noise and vibrations in many areas of technology. Here, we’ll take a closer look at rotordynamics and its relevance within various applications.

### Using Simulation to Ensure the Cooling Efficiency of Refrigerated Trucks

##### Caty Fairclough September 6, 2016

Refrigerated trucks must maintain a cool temperature in order to avoid damaging the products that they carry. Optimizing the insulation materials and cooling systems of these vehicles is therefore an important step in their design. To ensure that such components work effectively under open- and closed-door cycles, Air Liquide teamed up with SIMTEC, a COMSOL Certified Consultant, to perform heat transfer and CFD simulations with the COMSOL Multiphysics® software.

### 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.