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How to Compute Residence Time in Flow Models with COMSOL®
When designing and modeling devices such as chemical reactors, one of the quantities used to characterize the system is the residence time. This calculation is separate from the computation of the flow...
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Do Voltage and Ground Exist?
There are a few things that I learned in my university electrical engineering classes that I really wish would have been taught a bit differently. The concepts of voltage and ground fall into this...
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Voltage and Ground When Modeling Wave-Like EM Fields
This blog post continues our discussion of the terms voltage and ground. Here, we will define and interpret these terms for sinusoidally time-varying models. We look at the case of a transmission line...
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Wrapping and Warping Geometries for Analysis in COMSOL®
Suppose you have some CAD description of a part that will be deformed, such as a flexible printed circuit board. These CAD parts are designed in their undeformed, as-manufactured state. However, for...
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How Long Does It Take an Engineer to Turn on a Light Bulb?
There has recently been a lot of controversy online regarding an entertaining video that tries to address a big misconception about electricity: that electrons carry the energy in an electrical...
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How to Compute the Projected Area of a CAD File in COMSOL®
Have you ever wanted to compute the projected area of a CAD file? This can be useful in a variety of cases, such as for a quick estimation of the aerodynamic drag. There are several ways in which this...
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Modeling Emissivity in Radiative Heat Transfer
When modeling radiative heat transfer, we need to be aware of the concept of surface emissivity and that it can be dependent upon temperature, wavelength, angle, and other variables. Here, we will look...
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Modeling Incident Radiation in Radiative Heat Transfer
When dealing with radiative heat loads in a thermal model, we need to be careful to understand how the incident thermal radiation interacts with surfaces. If dealing with a system that does not have...
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Introduction to Computing Radiative Heat Exchange
When modeling radiative heat transfer, we need to think about how radiation is emitted from a surface and absorbed by other surfaces, as well as how much radiation is exchanged between surfaces. We’ve...
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Creating Schlieren-Type Visualizations in COMSOL Multiphysics®
One of the issues in the computational modeling of fluids is the question of experimental correlation. Although it is very easy to generate beautiful 3D visualizations of the numerical results,...
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Computing and Using Partial Inductance with COMSOL®
Version 6.0 of the COMSOL Multiphysics® software extends the functionality of the Magnetic Fields, Currents Only interface within the AC/DC Module to compute stationary and frequency-dependent...
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Computing and Visualizing Satellite Orbits in COMSOL®
The COMSOL Multiphysics® software is often used to solve problems involving field solutions to partial differential equations (PDEs), but it also has the capability to solve ordinary differential...
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How Large of a Model Can You Solve with COMSOL®?
One of the more common questions we get is: How large of a model can you solve in the COMSOL Multiphysics® software? Although at some level this is a very easy question to answer, it inevitably leads...
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Losses in Three-Phase Transmission Lines
One of my colleagues raised an interesting question about the losses in three-phase power transmission. It turns out that certain geometric arrangements of the conductors in a transmission line will...
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Computing Orbital Heat Loads with COMSOL Multiphysics®
With COMSOL Multiphysics® version 6.1, we are happy to announce the release of a new interface that computes radiative loads on satellites in orbit. This Orbital Thermal Loads interface is part of the...
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Intro to Modeling Transient Heating of Solids in COMSOL Multiphysics®
The COMSOL Multiphysics® software is often used for modeling the transient heating of solids. Transient heat transfer models are easy to set up and solve, but they aren’t without their difficulties to...
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Modeling the Pulsed Laser Heating of Semitransparent Materials
It’s quite common to use focused laser light to rapidly heat materials for various purposes, including within the semiconductor processing industry. Here, we will look at a Gaussian profile laser beam...
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Combining Volumetric Conductor Models and Lumped Elements
Are you ever in the situation of modeling the AC current distribution within conductors that are connected to lumped circuit elements such as capacitors, resistors, and inductors — but you do not want...
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Using Different Physics Interfaces for RF Electromagnetic Heating Models
The COMSOL Multiphysics® software is well suited for modeling RF heating, where one needs to solve for both the electromagnetic fields and the temperature distribution over time. Although you might...
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Understanding the Excitation Options for Modeling Electric Currents
If you are using the Electric Currents physics interface in COMSOL Multiphysics® for the modeling of electromagnetic heating, you may have noticed that there are many different ways of exciting a...
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