## How to Use Interpolated Material Data to Model Irregular Geometries

##### Hanna Gothäll March 20, 2018

We have already discussed different ways to create geometry objects of irregular shapes on the blog. In this blog post, we will demonstrate an incredibly powerful alternative approach by using interpolation functions. Instead of creating geometry objects, we will indirectly define the irregular shape by taking advantage of the spatial variation of a material property in the object we want to study.

### How to Use the Boundary Element Method in Acoustics Modeling

##### Mads Herring Jensen March 19, 2018

The boundary element method (BEM) is included in the Acoustics Module as a physics interface. This interface, available as of version 5.3a of the COMSOL Multiphysics® software, can be seamlessly combined with interfaces based on the finite element method (FEM) to model, for example, acoustic-structure interaction problems. This functionality expands the range of problems that can be solved with the Acoustics Module. Here, we look into the BEM functionality, examples, and BEM-specific postprocessing.

### Using the Inflow Boundary Condition in Nonisothermal Flow Simulations

##### Nicolas Huc March 15, 2018

Nonisothermal flow combines CFD and heat transfer analysis. In cases where the temperature of the fluid at an inlet is a known quantity, a Temperature boundary condition can be used. However, there are some important situations where this is not the case, and an Inflow boundary condition can improve the model accuracy and reduce the computational cost of the simulation. Here, we review how this more sophisticated thermal boundary condition can be set at a flow inlet.

### Happy Birthday, Albert Einstein

##### Jenn Nguyen March 14, 2018

“The important thing is to not stop questioning. Curiosity has its own reason for existing.” –Albert Einstein A passionate and curious intellectual, Albert Einstein is considered one of the most influential physicists of the 20th century. The German-born mathematician and physicist made numerous discoveries throughout his lifetime. Most notably, he developed the special and general theories of relativity. For discovering the law of the photoelectric effect, he earned a Nobel Prize in Physics in 1921.

### Modeling Phase Change in a Thermosiphon

##### GuestMandar Gadgil March 12, 2018

Guest blogger Mandar Gadgil of Noumenon Multiphysics discusses modeling phase change in a thermosiphon. Thermosiphons have been used for keeping houses warm since the 1800s. These devices use central heaters and pipe networks that carry water and steam to different rooms. The cool part (figuratively) is that no pump is needed for fluid transport — convective currents induced by the heater located at the bottom of an installation are enough. Let’s discuss modeling thermosiphons using a “pseudofluid” with temperature-dependent properties.

### How to Run on Clusters from the COMSOL Desktop® Environment

##### Lars Drögemüller March 9, 2018

Many types of analyses benefit from running the COMSOL Multiphysics® software on high-performance computing (HPC) hardware. This is one of the main reasons behind the Cluster Computing node, which helps seamlessly integrate the COMSOL® software with any kind of HPC infrastructure, while maintaining the convenience of a graphical user interface. In this blog post, learn how to run large simulations remotely on HPC hardware directly from the COMSOL Desktop® graphical environment.

### Top 4 Reasons to Attend the COMSOL Conference

##### Frida Nilsson March 8, 2018

Each year, the COMSOL Conference brings the simulation community together to advance modeling skills and discuss innovations in science and engineering. Attendees come to the conference from a wide range of technical backgrounds and industries, and the event offers something for everyone. Keep reading for four reasons why you should attend the COMSOL Conference this year.

#### Categories

##### Caty Fairclough March 7, 2018

Additive manufacturing has a wide array of applications, such as creating custom medical devices, aerospace components, and artwork. With the list of potential uses continuing to grow, it’s important that this type of manufacturing can keep up with the demand. However, analyzing and optimizing this complex process can be difficult. What can engineers do to overcome this challenge?

### Happy Birthday, Joseph von Fraunhofer

##### Caty Fairclough March 6, 2018

In 1801, the building around a glassmaker apprentice named Joseph von Fraunhofer collapsed, trapping him in rubble. While he didn’t know it at the time, this dramatic event (and resulting encounter with a prince-elector and politician) set him on the path toward improving the field of optics…

### Analyzing Triaxial Testing Methods for Geomechanics

##### Thomas Forrister March 5, 2018

The foundation of a tunnel, dam, building, or other structure can be analyzed with a method called triaxial testing. Performing triaxial tests before, during, and after construction helps to ensure that structures are safe and reliable. To better understand the mechanics of soil and improve a structure’s stability, you can model the loading and unloading curves for a triaxial testing apparatus and test the soil’s model parameters in the COMSOL Multiphysics® software.

### Happy Birthday, Frances Spence

##### Thomas Forrister March 2, 2018

Frances Spence was an American mathematician and one of the first computer programmers in history. She is best known for her work as a programmer of the first digital computer, Electronic Numerical Integrator and Computer (ENIAC). Although she helped program the computer during WWII, her contributions to computer programming have only recently been recognized.