Each page solves a parametric PDE as you move the controls, through a fast surrogate of the full solver. Press "compare with the full solver" on any page to see the reference solution, both times and the error.
Steady Navier–Stokes in a channel. Drag the object through the flow and reshape it in the editor; set the viscosity (Reynolds numbers up to 200 based on the object). Above about 50 the real flow would be unsteady: what you see is the steady branch.
Drag an inclusion through a heterogeneous medium and reshape its boundary with control points; the solution and the flux follow. Contrast 0.01 to 100. One model for every shape and position.
Set the first ten coefficients and the decay exponent s of a 200-term expansion, or draw everything at random; rough and smooth coefficients from one surrogate.
A three-dimensional parametric coefficient; scrub through the volume with slice sliders. Tens of milliseconds against about a second for the full solve.
Jakob Zech, Heidelberg, 2026. Surrogate details to appear.