Download Essential EMC tools
Download Troubleshooting Case Studies
Download Simulation Files
SPICE based simulations are simple and quick. We use Simetrix for most of the job. A free version of the software can be downloaded from https://www.simetrix.co.uk/downloads/download-elements.html
LTSPICE is perhaps more widely accepted by electronics engineers. Here is a good article talking about simulating conducted emissions of a buck converter. https://www.analog.com/media/en/technical-documentation/tech-articles/how-to-get-the-best-results-using-ltspice-part-1.pdf
