Joshua Thomas

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 …

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Temperature-Dependent Coefficients of Thermal Expansion

Making accurate physics predictions using simulations requires a knowledge of the material properties and how to implement them correctly in the software. This is particularly important in analyses involving thermal expansion when the coefficients of thermal expansion (CTEs) of the materials vary significantly with temperature. For example, optical devices that operate in the vacuum of …

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Solver Improvement in COMSOL Multiphysics Version 5.6

At AltaSim, we await COMSOL’s improvements to their software with great anticipation.  We take time to evaluate these changes to determine what we can use to better serve our clients.  Based on our review, we also pass on our insights via Tips & Tricks. Version 5.6 of COMSOL Multiphysics has introduced serval solver improvements that …

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Model Parameterization, Part Two: Ball, Box and Cylinder Selections

In last month’s Tips and Tricks article AltaSim introduced the topic of model parametrization, describing the process and a few of the benefits.  Effective parametrization of a model file takes time and thought to implement correctly.  This article will extend the approach discussed in Part 1 to include one important recommendation for robust geometric parametrization.  …

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Model Parameterization, Part One

When learning to use a simulation software such as COMSOL Multiphysics, users typically focus on learning the fundamental tools and steps for building a model and getting results, e.g. geometry building, applying boundary conditions, defining material properties, meshing and post-processing.  These skills are crucial for developing a working and useful model, so it is a great place to start. Once a user has acquired these basic skills for getting a working model, AltaSim …

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Solver Speed-up for Conjugate Heat Transfer with Radiation

COMSOL Multiphysics® can solve conjugate heat transfer problems that include conduction, convection and radiation.  Both Surface-to-Ambiant and Surface-to-Surface radiation formulations are available.  Follow this link June 2019 COMSOL Electronics Cooling Webinar for our recent Webinar that includes a step by step demonstration of implementation in COMSOL Multiphysics®. When using Surface-to-Surface radiation, we strongly recommend that the radiation …

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