Using Low-Reflecting Boundary Conditions to Model Wave Propagation

Bridget Cunningham April 6, 2017

Modeling the propagation of waves from a large vibrating structure can be a challenging task. It requires balancing the reduction of the computational domain’s size with the decrease of reflection at surface boundaries. With the low-reflecting boundary conditions in the COMSOL Multiphysics® software, we can easily reduce our computational domain to a practical size while ensuring accurate simulation results. Today, we illustrate this with the example of modeling wave propagation in rocks under blast loads.

Read More

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.

Read More

Categories

Walter Frei April 4, 2017

Have you ever wanted to query the results of your model within an arbitrary geometric subregion? You might think that this requires adding geometries to a model and recomputing the solution. Instead, in the COMSOL Multiphysics® software, we can just add and reposition a part solely for the purpose of evaluating the results. We will demonstrate this in the context of computing mutual inductance between coils and discuss simpler techniques that can be used for a reduced set of cases.

Read More

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.

Read More

Caty Fairclough March 31, 2017

When designing multibody systems, interconnected flexible and rigid bodies must be analyzed to see how they are affected by large rotational and translational displacements. While we can achieve this with the Multibody Dynamics Module in the COMSOL Multiphysics® software, we first want to confirm the reliability of the simulation results. Here, we discuss a benchmark model of a four-bar mechanism that helps prove the validity of these multibody dynamics simulations.

Read More

Bridget Cunningham March 28, 2017

Measuring acceleration is important in high-speed dynamics, as velocity, force, and pressure are derived from it. Sensing elements inside accelerometers make it possible to obtain such measurements. As technology advances, these sensor packages must be optimized to handle higher vibrational frequency bandwidths. To accomplish this, researchers tested their novel piezoresistive sensor chip as part of a package design. Their simulation results, which agree well with experimental data, pave the way for optimizing sensor packages to achieve higher bandwidths.

Read More

Bridget Cunningham March 27, 2017

Wilhelm Röntgen was a German physicist who is best known for his discovery of X-rays — a finding that earned him the first Nobel Prize in Physics. Recognized as the father of diagnostic radiology, Röntgen’s contributions marked a revolutionary breakthrough within the medical community. On this day, the anniversary of his birthday, we celebrate the life and legacy of this influential figure.

Read More

Categories

Caty Fairclough March 24, 2017

Magnetic resonance imaging (MRI) systems must produce high-resolution images in order for doctors to accurately diagnose their patients. To achieve this level of image quality, there must be a known reliable base magnetic field distribution within the MRI machine and its components, such as birdcage coils. This is where simulation comes in. By designing MRI birdcage coils with the COMSOL Multiphysics® software, we can manipulate and optimize the magnetic field and improve the scanned data that MRI machines generate.

Read More

Categories

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.

Read More

Categories

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.

Read More

Bridget Cunningham March 21, 2017

Exposure to the environment can negatively impact an antenna’s radiation characteristics and lead to greater losses. One way to protect these devices is with radomes, which are enclosures that can shield antennas while improving their overall performance. When designing a radome, measuring its effectiveness is key, as designs without optimized configurations have less influence. With the example of a patch antenna, we discuss using simulation to gain insight into a radome’s ability to improve antenna directivity.

Read More

Categories


Categories


Tags

1 5 6 7 8 9 122