PocketFlow: Water Simulator

Real water, live on your iPhone. Draw a shape with your finger or build one in 3D, and watch water pour over, under and around it as it happens. PocketFlow runs a real free-surface water simulation on your phone's GPU. It isn't an animation: every frame is solved by our own solver, so the water splashes, jumps and settles because the physics says so. BRING YOUR OWN MODEL (STL) Import a 3D model from CAD or a 3D-print file: from Build, Files, Mail or AirDrop. Choose the unit it was made in and a model scale (the largest that fits is suggested), and every number can show at full size. Models move, turn, size, snap and duplicate like any shape, can poke through the walls and floor, and can have up to a million triangles. TWO WAYS TO PLAY • 2D Sketch: a side view of a tank. Draw solids right in the water with a pen, box or oval, and the flow reacts straight away. • 3D Build: add boxes, spheres and cylinders. Slide them with an axis lock, size any side, turn about any axis, or type exact numbers. START FROM A TEMPLATE Every template opens already running. • 2D: Open channel, Dam break, Sluice gate, Weir • 3D: Channel + pier, Weir, Dam break, Labyrinth weir, Dam & stilling basin, and Mystery dam: a dam, spillway and stilling basin built from an STL, at 1:100 SET THE SIDES Make each side of the tank a wall or open to the air. Add an inlet by velocity or by flow rate, or hold a side at a water level, with or without inflow. Set the tank size and the starting water, or start empty. SEE WHAT'S GOING ON • Show plain water, or colour it by velocity or pressure • Section view in 3D cuts the tank open to show the flow inside • Probe pins with live velocity, depth and Froude readouts • Streamlines that follow the flow • A measure ruler that snaps to walls and edges • Live In and Out, with a Filling or Steady cue so you know when the flow has settled TILT TO SLOSH Tap Tilt and tip your phone. The water runs to the low side, like a real tank in your hands. THINK FULL SIZE Working with a scale model? Pick a scale such as 1:25 and every number shows at full size, scaled by Froude similarity. TRACE OVER A PHOTO In 2D, add a photo or drawing as a background, set it to true size from a known length, and draw your solids over it. SHARE IT Save or send a photo with the colour scale on it, or a 10-second clip. EASY TO PICK UP A seven-step Quick start shows you where to press. Your scenes save themselves, Continue takes you back to where you left off, and Fast, Balanced and Detailed quality presets let you choose between speed and detail. GOOD TO KNOW • Free-surface water only: no air flow, gases or heat • Runs fully on the device: no account, no ads, no tracking, works offline • One price, no subscriptions and no in-app purchases • Made for learning, exploring and quick what-ifs. It is real physics, but it is not a certified engineering design tool, so check real designs with proper engineering analysis. Great for students and teachers, engineers who want a quick feel for a flow, and anyone who likes watching water.