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Understanding the Transient Electromagnetic Excitation Options
If you are modeling electrical signals that are varying arbitrarily in time, you can often use the computationally efficient Electric Currents interface in the COMSOL Multiphysics® software to compute...
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Modeling Periodic Electric Signals and Their Thermal Effects
There are many situations where you may be interested in modeling periodic, albeit nonsinusoidal, electrical signals for the purposes of computing the resultant electric fields, thermal losses, and...
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Modeling Dispersion in an Electric Currents Model
With the release of version 6.2 of the COMSOL Multiphysics® software, electrical dispersion modeling capabilities can now be extended to the Electric Currents interface, which supports both time- and...
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Understanding Higher-Order Diffraction
When a plane wave of electromagnetic radiation, e.g., light, is incident upon a planar periodic structure, higher-order diffraction may occur. This means that the light will not only reflect and...
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Learning from the Two-Capacitor Paradox: Do Capacitance and Inductance Exist?
The two-capacitor paradox is a provocative thought experiment set up to expose some of the limitations of electrical circuit modeling, and many different ways of resolving the paradox have been...
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Using Differential Inductance and Coils in COMSOL Multiphysics®
When modeling a low-frequency electromagnetic system involving coils, nonlinear materials, magnets, and moving parts, we are often interested in computing the differential inductance. Differential...
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Treating Time as a Space Dimension
Certain modeling problems can lead to particularly elegant solutions. One such case recently presented itself in the form of finding the time-periodic stationary solution to a problem involving a...
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Modeling Absorption and Scattering of Collimated Light
When a ray of collimated light, such as from a laser, is incident upon a semitransparent medium, it can experience both absorption and scattering. This means that the incident light is both converted...
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Solving Delay Differential Equations to Model…Marmots?
With the release of version 6.3 of the COMSOL Multiphysics® software, it is now possible to use previous solutions from a time-dependent study at the current time step. That is, the solution from an...
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Modeling Electrical Contact Resistance at Bolted Joints
With the release of version 6.3 of the COMSOL Multiphysics® software, there is a new Interior Contact boundary condition available in the Solid Mechanics interface. This boundary condition simplifies...
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