How to Couple the Electrical Circuit with Electrostatic Physic in COMSOL Multiphysics (Tutorial)?

In this COMSOL tutorial for beginners, you will learn how to couple COMSOL Electrostatic Module with an Electrical Circuit to create powerful finite element simulations. We walk through adding electrical circuit physics to a project, defining circuits in COMSOL Multiphysics, and integrating electrical circuit elements seamlessly into your model. In this tutorial, a capacitor in the FEM domain is connected to a voltage source and a resistor to model an RC circuit and a low-pass filter.

Discover how to set up external device coupling in electrical circuits, define time-dependent study settings for an RC circuit, and plot node voltages and device currents versus time. You'll also learn how to create dual Y-axis plots for comparison, activate the frequency domain study, and plot the filter magnitude response in dB against frequency.

We guide you through calculating the 3dB cut-off frequency of and RC low-pass filter from both magnitude and phase responses, allowing for complete circuit analysis. If you're interested in filter design, frequency domain analysis, or integrating the electrostatic module with external circuits in COMSOL, this video covers everything you need!

Don't miss out on mastering COMSOL’s circuit simulation tools, perfect for professionals and students in electrical engineering. Watch now to optimize your COMSOL Multiphysics experience!

00:00 Introduction to Electrical Circuit Modeling in COMSOL Multiphysics
01:07 Adding Electrical Circuit Physics to an Existing COMSOL Project
01:51 Defining Electrical Circuits in COMSOL Multiphysics: A Step-by-Step Guide
03:20 How to Add Electrical Circuit Elements to Your COMSOL Model
04:17 Setting Up External Coupling: Defining Physical Models as External Devices in Electrical Circuits
05:47 Choosing Optimal Simulation Time and Time Step for Time-Dependent Studies in COMSOL
07:05 Plotting Node Voltages and Device Currents Over Time in COMSOL Electrical Circuits
08:09 How to Create a Dual Y-Axis Plot in COMSOL for Comparing Parameters
09:44 Activating Frequency Domain Studies and Setting Simulation Steps in COMSOL
11:25 Plotting Filter Magnitude Response (dB) vs. Frequency in COMSOL Multiphysics
12:48 How to Calculate 3dB Cut-off Frequency from Magnitude Response in COMSOL
13:18 Plotting Filter Phase Response vs. Frequency in COMSOL
14:02 Calculating 3dB Cut-off Frequency from Phase Response in COMSOL

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