Sketch CFD

Sketch CFD is an educational tool for learning computational fluid dynamics (CFD) from simple sketches: draw it, then simulate it. Draw walls, inlets, fans, and heaters, or photograph a sketch drawn on paper, and watch the flow, gas mixing, and heat develop as the calculation runs. Results are estimates; see "Educational use only" below. DRAW IT • Lines, rectangles, circles, curves, freehand strokes, and dimensions in mm, with snapping, undo, and redo. • A role for each part: wall, inlet, fan, open edge, gas source, hot or cold wall, or probe. PHOTOGRAPH A SKETCH DRAWN ON PAPER Draw on plain white paper with the 18 symbols shown in the app, then photograph it. The app reads the lines and symbols and builds a sketch over the drawing. Check each part on the review screen, type the values you wrote (this version does not read handwriting), set the scale, and run it. The photo is read on your device and is not uploaded. The sample drawing is free; importing your own photos is part of Pro. SIMULATE IT • The flow runs live and follows every change you make. • See speed (m/s), pressure (Pa), temperature (°C), and gas shares (%), with flow arrows. • Read probes, forces on parts (N), and port flows (L/min). • Help explains the lattice Boltzmann model and what it leaves out. LEARN WITH 14 EXAMPLES Each has notes on what it shows, a published value to compare with where there is one, and what to try. • Flow and forces: Lid-driven cavity, Channel flow check, Backward-facing step, Duct with a cylinder, Airfoil in a wind tunnel • Heat and buoyancy: Water heated from below, Room with a radiator, Hot and cold water in a tee, Fume hood capture • Mixing, purging and dispersion: Box purge, Round jet, CO2 leak in a lab, Wind around a building • Particles: Dust settling chamber ON YOUR DEVICE Apple Pencil draws while your fingers pan and zoom, and a keyboard, trackpad, or mouse works on iPad. Drawing and calculation run on your device and work offline. No account and no ads. FREE AND PRO Free: run and explore all 14 examples, and draw walls of any shape in a wind tunnel (200 mm × 100 mm of air) at Coarse or Medium resolution. Sketch CFD Pro adds: design anything (inlets, outlets, fans, heaters, gas sources, and probes, in any size); gases and liquids, heat and buoyancy, and particles; Fine meshes; editing the examples; importing your own paper drawings from a photo; and reports. If your subscription ends, your sketches still open and run. EDUCATIONAL USE ONLY Sketch CFD is for education and learning only. Its results are estimates from a simplified two-dimensional model. The calculation is verified against published benchmark cases, such as the lid-driven cavity, flow around a cylinder, and a heated square cavity, but it has not been validated against measurements or tested in real-world scenarios. It is not a substitute for professional engineering analysis, testing, or applicable codes and standards. Do not use it for safety-critical, medical, or compliance decisions. You use the results at your own risk; to the extent the law allows, Journey On is not responsible for any loss or decision based on them. See the Terms of Use. SUBSCRIPTION Sketch CFD Pro is an auto-renewable subscription, monthly with a 7-day free trial or yearly with a 14-day free trial, for eligible new subscribers. Payment is charged to your Apple Account at confirmation of purchase, or when the free trial ends. The subscription renews automatically unless canceled at least 24 hours before the end of the current period, and renewal is charged within 24 hours before the period ends. Manage or cancel it in your Apple Account settings. Any unused part of a free trial is forfeited when you purchase a subscription. Terms of Use: https://sketchcfd.journeyon.co/terms Apple's Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://sketchcfd.journeyon.co/privacy