Fluid | Posted on
April 5th, 2013 by
Have you ever noticed how water can flow through rocks and leave a trace of its passage by covering the surface with a patina, like white stripes? The whole process is quite complex but can roughly be explained by breaking it down into two coupled effects: gravity and chemical reactions. Gravity causes the water to infiltrate through discrete fractures (hard rocks) or pores (sedimentary rocks), until it charges the groundwater supply below to a point where excess water will surface on the face of the rock, like an overflowing glass of water. Chemical reactions, on the other hand, allow water to dissolve carbonates and similar substances present in the rock. Such chemical compounds will start sticking and accumulating on the surface.
Read more on: Discrete Fracture in Rocks
Mechanical | Posted on
April 4th, 2013 by
Back in January, I presented a video tutorial introducing the Structural Mechanics Module here on the blog. The video described the steps necessary to perform a static linear analysis on a bracket geometry. Now, to help you better understand the extra functionalities that exist within COMSOL Multiphysics and the Structural Mechanics Module, we are also creating additional tutorial videos of this bracket. The first two “mini-tutorials” to accompany the static linear analysis video focus on adding initial strain and thermal stress, and you can watch them here.
Read more on: Structural Mechanics Tutorials: Adding Initial Strain and Thermal Stress
Tips & Tricks | Posted on
April 3rd, 2013 by
Some structural applications involve thin or high aspect ratio structures sandwiched between other relatively low aspect ratio structures. For example, if a piezoelectric transducer is glued on the surface of a mechanical system, the thickness of the adhesive layer is very small in comparison to the two structures it glues together. Numerical modeling of such a thin layer in two or three dimensions requires resolving it with an appropriate finite element mesh. This can result in a large concentration of finite elements near the adhesive layer, leading to high computational cost and time. To avoid this issue, one common assumption many numerical simulations make is to assume perfect bonding between the two structures. By making this assumption, the numerical model ignores the effect of the flexibility of the adhesive layer. This will lead to inaccurate results because the adhesive layer is not infinitely stiff. In this blog post, we will show how to model such thin layers using COMSOL Multiphysics — without the need to draw the layer’s thickness explicitly, while still accounting for the effect of the thin elastic layer. This can lead to a more efficient structural analysis with significant reduction in computational cost and time, without sacrificing the accuracy of the simulation.
Read more on: Structural Analysis with Thin Elastic Layers
Tips & Tricks | Posted on
April 2nd, 2013 by
A question that comes up occasionally is whether or not you can compute the inductance of a single straight wire. This seemingly simple question actually does not really have an answer, and gives us the opportunity to talk about a very interesting point when solving Maxwell’s equations. Anybody working in the field of computational electromagnetics should have an understanding of this key concept, as it will help you properly set up and interpret models involving magnetic fields.
Read more on: Computing the Inductance of a Straight Wire
Electrical | Posted on
April 1st, 2013 by
In the world of bearings, there are many different types to choose from. For certain applications, magnetic bearings trump their mechanical counterparts in several regards. In order to understand how the bearing will perform, using a simulation tool to calculate design parameters is a good idea.
Read more on: Magnetic Bearings
Multiphysics | Posted on
March 29th, 2013 by
Smart materials are able to convert one form of energy to another. These materials can be either solid or fluid, and are typically located within what’s called a smart structure. What makes these materials and structures so “smart”? Let’s find out.
Read more on: Smart Materials Innately Transduce Energy, How Smart
Conference | Posted on
March 28th, 2013 by
As many of you may know, we have officially announced the dates for the COMSOL Conference 2013. Did you also know that we are continuously sharing updates, deadline reminders, past published Conference User Presentations, and more through social media? Follow our social pages to make sure you have up-to-date information regarding the Conference (among other things) — don’t forget to share this content with your friends and colleagues, too.
Read more on: Tell All Your Friends About the COMSOL Conference 2013
Electrical | Posted on
March 27th, 2013 by
In a previous blog entry I discussed some of the exotic properties of graphene. The fact that graphene consists of a single layer of atoms means the aspect ratio of any graphene-based structure may be very high. High aspect geometries present their own array of modeling challenges.
Read more on: The Graphene Revolution: Part 2
Heat Transfer | Posted on
March 26th, 2013 by
A lot of effort is put into inventing or improving existing technologies used to cool buildings, food, or any goods that need to be stored at a definite temperature. The reason is simple: adopting more efficient designs will result in achieving the same goal while consuming less energy. Both our balance sheet and the environment will benefit from these solutions. Here we will explore modeling temperature of a passive cooling design using a wine cellar as an example.
Read more on: Modeling Temperature of a Wine Cellar
Events | Posted on
March 25th, 2013 by
Dr. Raj Thiagarajan is a prolific producer of interesting research articles ranging from waste-water treatment to acoustics metamaterials, and lots in between. As the Managing Director at ATOA (“Atom TO Application”) Scientific Technologies, a COMSOL Certified Consultant, Raj has had to simulate all types of applications. Now he will show you how to use multiphysics simulations in multimaterial and composite product design.
Read more on: How to Model Multiphysics in Multimaterial?