Joshua Thomas

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.  …

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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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