How to Simulate the Piston Effect in Train Tunnels

Why do you have to yawn or swallow to equalize the pressure in your ears when travelling through a tunnel? It’s all to do with a phenomena called the piston effect. What is the piston effect? When a train enters a tunnel, it compresses the air ahead of it, as the air it displaces is […]

Wind Squall CFD Simulation with HELYX

In central Europe, in the height of summer, especially in the evening of hot days, it is not uncommon to experience heavy thunderstorms. During one such event in summer 2019, I witnessed, what looked like, a dust devil forming for a few moments, which then also ripped off the larger part of the roof of […]