WaveDyno is a full 1D gas-dynamics simulator: a finite-volume pipe solver that captures the pressure waves in your expansion chamber, port timing and scavenging models, and dyno sweeps across the rev range. Nothing to install.
Free plan with daily run limits. No credit card.
Sweep the whole rev range and watch the pipe come alive where it should.
What's inside
A quasi-1D finite-volume solver tracks the actual compression and expansion waves in your pipes. The expansion chamber is simulated, not estimated from empirical factors.
Shaped exhaust and transfer windows, timing charts, blowdown time-area, and scavenging models. Discharge coefficients come from CFD-measured port flow maps.
Full rev-range sweeps with per-point convergence checks, so you know which numbers to trust. Overlay runs and diff every input against a baseline.
Crank-resolved cylinder and crankcase pressure, port mass flow, and temperature traces for any point in the sweep. See exactly what the pipe is doing to the cylinder.
Watch pressure waves travel along the exhaust system against crank angle. The return wave either arrives on time or it doesn't, and you can see why.
Runs in any modern browser on any machine. Simulations execute on server hardware, projects live in the cloud, and setup wizards get you to a running engine in minutes.
The solver core is validated against classic shock-tube references and OpenFOAM CFD cases covering wave propagation, cone reflection, open-end radiation, and port flow. Exhaust port discharge coefficients are measured from 3D CFD on formed port geometry, not guessed.
The current goal is matching real dyno sheets across a range of engines. That is exactly what the tester program is for: if you have an engine with known specs and a real dyno chart, we want to see how close the sim gets and where it misses.
Why this exists
When I was 16, I rode the train an hour each way with a university library pass to borrow Gordon P. Blair's Design and Simulation of Two-Stroke Engines. I've wanted to build my own simulator ever since. A few decades later, I finally did.
Pierre Havelaar, builder of WaveDyno
Access
Every feature is included: full gas-dynamics sweeps, cycle analysis, wave diagrams, project storage, and run comparison. Daily run limits keep the free plan sustainable.
Create a free accountHave an engine with known specs and a real dyno sheet? Testers get unlimited access while we gather validation data, in exchange for honest feedback on where the sim hits and where it misses.
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