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General Blog Posts

Deformed Mesh Interfaces: Rotations and Linear Translations

September 7, 2015

When using the finite element method, we often want to model solid objects that are rotating and translating within other domains. The deformed mesh interfaces in COMSOL Multiphysics can be used to model these movements. In this blog post, we will look at the modeling of large linear translations and rotations of domains within other domains, while introducing efficient modeling techniques for addressing such cases.

Model Translational Motion with the Deformed Mesh Interfaces

September 4, 2015

COMSOL Multiphysics includes two interfaces for manually defining the deformation of finite element mesh, the Deformed Geometry interface and the Moving Mesh interface. In this blog post, we will address when to use these interfaces and how to use them to efficiently model translational motion.

Improving Your Meshing with Swept Meshes

September 2, 2015

Modeling geometries with high aspect ratios can be one of the more challenging tasks for the finite element analyst. You want to have a mesh that will accurately represent the geometry and the solution, but you do not want too many elements, as solving your models would then require excessive computational resources. Here, we will look at using swept meshing to generate efficient and accurate finite element meshes in the context of some common modeling cases.

How to Organize Your Simulation App Using Subforms

September 1, 2015

An important element in the design of any simulation app is organization. Maintaining an orderly structure makes it easier for you to build the app and also enhances the usability experience for app users. Today, we will show you how to create organized apps in COMSOL Multiphysics with the help of subforms and form collections.

How to Implement a Point Source with the Weak Form

August 24, 2015

Today we continue our discussion on the weak formulation by looking at how to implement a point source with the weak form. A point source is a useful tool for idealizing the situation where a source is concentrated in a very small region of the modeling domain. We will find that it is very convenient to set up such a point source using the weak form.

How to Build an App from a COMSOL Multiphysics® Model

August 18, 2015

The Application Builder is an easy-to-use tool built into COMSOL Multiphysics. After watching the 10-minute video below, you will know how to build a functioning app from a model — and be on your way to building your own customized simulation apps.

App: Measuring the Diffraction Efficiency of a Wire Grating

August 13, 2015

Diffraction gratings are often used as a tool for bending and spreading light in optical instruments. Analyzing the diffraction efficiency of such optical components is important, as this can affect the instrument’s performance. Simulation offers an efficient way for testing various grating designs to achieve an optimal configuration. By creating a simulation app, you can further expedite this process, extending simulation capabilities to a wider audience. Our Plasmonic Wire Grating Analyzer demo app highlights this approach.

Using General Extrusion Operators to Model Periodic Structures

August 11, 2015

In the course of building multiphysics models, we often encounter situations in which the solution to one physics is periodic — or very nearly so — while the solutions to other physics of interest are nonperiodic. If we know this ahead of time, it is possible to exploit the periodicity to reduce computational requirements. Here, we will demonstrate how to accomplish this using the General Extrusion component couplings in COMSOL Multiphysics.


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