VisuApps
Grasp quanta, particles and flows interactively
Apps
Wasserhahn mit glasklarem Strahl: Durchfluss und Mündungsdurchmesser steuern die Reynolds-Zahl. Laminar steht die Form still, obwohl Farbstoff-Tracer mit Metern pro Sekunde hindurchfließen; im Übergang kräuselt sich die Oberfläche, turbulent zerfällt der Strahl in Tropfen. Ein Finger im Strahl zeigt, wie empfindlich die Ordnung ist.
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Single quanta arrive as dots on the screen, and thousands of hits grow into the fringe pattern. The detector slider raises which-path information continuously — the fringes fade into two humps without anything changing at the source.
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Compare particles, waves and individual quantum detections. Adjust slit spacing and wavelength, then enable a which-path detector to remove interference.
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50 real CMS events from the CERN Open Data Portal inside the detector: tracks, jets and calorimeter hits. Click two muons, let the invariant mass be computed — and with every entry the Z peak at 91 GeV grows in the spectrum.
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The equation behind every flow, computed live: stir dye into the field, turn the Reynolds number from viscous to turbulent, switch scenarios from cylinder to free jet. Every term of the equation can be switched off on its own — without the nonlinear transport term the vortex street collapses at once. Plus the Millennium Problem: why vortex stretching is absent in two dimensions and present in three.
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Density-driven flow in a porous medium (Darcy-Boussinesq, computed live on a 512² grid): a heavy phase above a light one is unstable — whether the front merely smears diffusively or breaks into narrow fingers is decided by the Rayleigh number. Two scenarios: unstable layering and CO₂ injection at the ceiling (the mechanism of convective dissolution in CO₂ storage); views for concentration, stream function and speed, tapping perturbs the front locally.
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Explore the thought experiment, entangled branches and measurement. Compare many boxes with radioactive decay and examine the role of decoherence.
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Toroidal field, tokamak and stellarator compared: without twisted field lines, ions and electrons drift apart and the plasma drifts onto the wall. The stellarator achieves the twist with 50 bent coils alone, without a current in the plasma. Field lines, particle orbits (Boris pusher), Poincaré section with magnetic islands and triple product.
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Ein Kübel Wasser am Seil über Kopf geschwungen: Drehzahl und Seillänge einstellen, Kraftpfeile am Scheitel beobachten. Bleibt v² ≥ g·r, drückt der Boden das Wasser nach innen; darunter wird die Bodenkraft null und das Wasser kippt in Zeitlupe heraus — ganz ohne „Fliehkraft".
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