# COMSOL Multiphysics

## Continuity Pairs for Electrical and Thermal Contact

Thermal stresses are an important design concern for many engineering applications.  When temperatures change, materials can deform or warp leading to the build-up of internal stresses even without the presence of external constraints which can further increase thermal stresses.  Modeling and simulation can calculate the deformations, stresses and changing contact pressures using thermal-structural interaction techniques.  […]

## Watch Out for Transparent Layers

Many engineers solve heat transfer challenges regularly. Over the last 20 years, AltaSim has developed hundreds of simulations for our clients that include heat transfer as a component. This Tip comes from our experience in solving a heat transfer problem that included thin layers of different materials. Solid elements are the most widely used type

## Using Evaluation Operator in Post-Processing

Engineers post process their simulation results for reasons that range from better understanding their results to communicating those results to others.  Developing labels that clearly identify the conditions for a simulation communicates the critical input parameters for the plotted results. In this Tip and Trick, the simulation engineers at AltaSim will show a way to

## Electromagnetic Wave Polarization in 2D Geometry

An electromagnetic wave consists of a coupled oscillating electric field and magnetic field which are always perpendicular to each other. By convention, the “polarization” of electromagnetic waves refers to the direction of the electric field. In 3D geometry, arbitrary polarization is naturally defined by the prescribing the directions of all three components of the electric

## Use of Computational Simulation of Medical Technology – Part 7

Multiphysics Modeling of Cooled RF Ablation In previous blog posts, we have provided extensive discussion on the Use of Computational Simulation of Medical Technology[1].  To provide a specific demonstration, this blog post will focus on describing the implementation of a multiphysics simulation of a cooled RF ablation (C-RFA) device. Traditional vs Cooled RF technology Traditional

## Cross Section Feature

In working with our customers, AltaSim often seeks to solve an initial problem in two dimensions to save computational time. The CAD we receive from our customers is routinely in three dimensions, and our engineers need to reduce the dimensionality of the solution space. In the past, our engineers spent significant time re-creating CAD in

## Discontinuous Galerkin Method

The significant flexibility of COMSOL Multiphysics represents one of the primary reasons AltaSim uses this software as our main simulation tool. In this installment of our Tips & Tricks, we are going to review the discontinuous Galerkin (DG) method that COMSOL has implemented. AltaSim has found that for the cases described in this article, DG

## Selection of Exterior Boundaries

At virtually every step of the model creation process, you need to select and apply materials, physics boundary conditions, and other settings to your model geometry. Bookkeeping of these settings can be challenging, especially when you re dealing with large, complex geometries and multiple physics interfaces. In COMSOL Multiphysics, Selections provides a tool to organize your model