Gallery

Image Gallery

Outputs from the OTOM simulation software. More details can be found in the OTOM documentation.

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OTOM SPH demo gallery

Offline renders of the 29 demo scenes in the OTOM SPH tool: GPU particle simulations of liquids, powders and moving machinery. Each picture is a frame exported from the browser app and rendered in Blender Cycles. Click a picture for the full-size image.

Rigid particles & powders

Blender render of the OTOM SPH demo: Coffee beans dry mixer — **Coffee beans dry mixer**680 coffee beans tumbled by a spinning paddle in a dry cylindrical mixer: only bean-to-bean and bean-to-wall contact.

Blender render of the OTOM SPH demo: Cohesive wet granules mixer — **Cohesive wet granules mixer**Capsule-shaped granules with a cohesion bond number: wet, sticky particles that form clumps, which the paddle breaks apart.

Blender render of the OTOM SPH demo: Coffee beans rotary drum — **Coffee beans rotary drum**Coffee beans in a rotating drum with lifters – the motion of a roaster or dryer.

Blender render of the OTOM SPH demo: Rice rotary drum — **Rice rotary drum**Rice grains in a slowly turning drum: a rolling bed whose surface slope is the dynamic angle of repose.

Blender render of the OTOM SPH demo: Tablet coating pan — **Tablet coating pan**Tablets tumbling in a rotating coating pan; the cascading top layer is where a coating spray would land.

Blender render of the OTOM SPH demo: Vibratory feeder pellets and flakes — **Vibratory feeder pellets and flakes**Pellets and flakes conveyed by a tray vibrating at 3 Hz – two shapes that travel and segregate differently.

Blender render of the OTOM SPH demo: Funnel discharge to reservoir — **Funnel discharge to reservoir**Spheres flowing out of a hopper once its gate opens, filling a reservoir below.

Blender render of the OTOM SPH demo: Funnel clogging jamming physics — **Funnel clogging jamming physics**The same hopper with static and rolling friction: particles arch over the outlet and the flow stops.

Blender render of the OTOM SPH demo: Disintegrator knife rotor flakes — **Disintegrator knife rotor flakes**Flakes struck by a fast knife rotor imported as a 3D mesh.

Blender render of the OTOM SPH demo: Disintegrator breakage and sieve — **Disintegrator breakage and sieve**The knife rotor breaks flakes into fragments, which fall through a sieve once they are small enough.

Particles in liquid & mixing tanks

Blender render of the OTOM SPH demo: Coffee beans in water — **Coffee beans in water**Coffee beans dropped into water: liquid and solids coupled both ways – buoyancy, drag and splash.

Blender render of the OTOM SPH demo: Chopped fibers stirred tank — **Chopped fibers stirred tank**Rigid rods (chopped fibres) stirred in water by a paddle.

Blender render of the OTOM SPH demo: Glass beads and fibers stirred tank — **Glass beads and fibers stirred tank**A mixed suspension of glass beads and fibres in a stirred tank.

Blender render of the OTOM SPH demo: Mixer sphere — **Mixer sphere**A sphere spinning fast off-centre in a water-filled cylinder, creating a deep free-surface vortex.

Blender render of the OTOM SPH demo: Bioreactor impeller slice plane — **Bioreactor impeller slice plane**A flat-blade impeller in a bioreactor, with a vertical cut plane coloured by flow speed.

Blender render of the OTOM SPH demo: ROS2 streaming stirred tank — **ROS2 streaming stirred tank**A stirred tank that streams particle positions and obstacle forces to ROS2 while it runs.

Blender render of the OTOM SPH demo: Cone vessel vibrating plunger — **Cone vessel vibrating plunger**A sphere vibrating up and down in a cone-shaped vessel, driving waves in the liquid.

Blender render of the OTOM SPH demo: Vibrating cylinder container — **Vibrating cylinder container**The whole container shakes, sloshing the liquid around a fixed cone.

Free surfaces & multiphase

Blender render of the OTOM SPH demo: Dam break impact on pillar — **Dam break impact on pillar**A water column released at one end hits a round pillar – the classic dam-break validation case.

Blender render of the OTOM SPH demo: Honey vs water dam break — **Honey vs water dam break**Two equal columns collapse side by side: water (blue) and honey (orange) with a much higher viscosity.

Blender render of the OTOM SPH demo: Oil and water separation — **Oil and water separation**Heavy water starts above light oil; the denser liquid sinks through it (Rayleigh-Taylor instability).

Blender render of the OTOM SPH demo: Wave maker paddle tank — **Wave maker paddle tank**A vibrating disk paddle at one end of a long tank generates travelling waves.

Blender render of the OTOM SPH demo: Ship hull bow waves — **Ship hull bow waves**A hull towed back and forth through still water.

Blender render of the OTOM SPH demo: Interactive water tank sandbox — **Interactive water tank sandbox**A calm tank to play with: drag the water to pull it, right-drag to push.

Flow, aerodynamics & analysis

Blender render of the OTOM SPH demo: Flow streamlines Box container — **Flow streamlines Box container**Water flowing through a box past a sphere, traced by streamline tubes.

Blender render of the OTOM SPH demo: Wind tunnel sphere drag and lift — **Wind tunnel sphere drag and lift**Air flowing past a sphere with live drag and lift coefficients.

Blender render of the OTOM SPH demo: Cylinder wake vortex shedding — **Cylinder wake vortex shedding**Top view of flow past a vertical cylinder, with a horizontal slice coloured by speed.

Blender render of the OTOM SPH demo: Pressure driven flow through packed bed — **Pressure driven flow through packed bed**Flow pushed by an inlet / outlet pressure difference through a bed of 12 spherical pellets.

Blender render of the OTOM SPH demo: Heat exchange streamlines — **Heat exchange streamlines**Air flowing through an imported heat-exchanger channel, traced by streamline tubes.

OTOM CFD demo gallery

Offline renders of the demo scenes in the OTOM CFD tool: GPU fluid simulations of vortex streets, shock waves, rotating machinery, heat and ventilation, and a gas-sparged stirred tank. Each picture is a run recorded in the browser app (“Record for Offline Render”) and rendered in Blender Cycles. Click a picture for the full-size image.

2D Flows

Blender render of the OTOM CFD demo: Kármán Vortex Street (Re 200) — **Kármán Vortex Street (Re 200)**A circular cylinder sheds vortices alternately from its top and bottom: the classic von Kármán street.

Blender render of the OTOM CFD demo: Honey Flow: Creeping Flow at Re 5 — **Honey Flow: Creeping Flow at Re 5**A very viscous fluid creeps round the cylinder: no separation, no wake vortices.

Blender render of the OTOM CFD demo: Aerofoil Wake (NACA 0012) — **Aerofoil Wake (NACA 0012)**A NACA 0012 aerofoil at incidence: the flow separates and rolls up into a train of large wake vortices.

Blender render of the OTOM CFD demo: Cylinder Wake with Glowing Tracers — **Cylinder Wake with Glowing Tracers**A long recirculation bubble (dark blue) behind the cylinder, starting to meander downstream.

Blender render of the OTOM CFD demo: Spinning Hexagon — **Spinning Hexagon**A hexagonal prism turning slowly in a cross-flow; its corners shed small vortices and pressure waves.

Logo in the WindThe word OTOM painted as a solid obstacle; every letter sheds its own vortices.

Blender render of the OTOM CFD demo: Hand-drawn Pipe (Control Volume) — **Hand-drawn Pipe (Control Volume)**A pipe of any shape drawn with the brush: everything outside the drawing is wall.

Blender render of the OTOM CFD demo: Greenhouse (Top View) — **Greenhouse (Top View)**Two greenhouse blocks seen from above, with gaps (vents) in their walls.

Blender render of the OTOM CFD demo: Car Side View (from a Photo) — **Car Side View (from a Photo)**A side-view photo of a car becomes the solid body; the road is the bottom wall.

2D Shocks & Supersonic Flow

Blender render of the OTOM CFD demo: Sod Shock Tube — **Sod Shock Tube**High-pressure gas (left) expands into low-pressure gas (right) after a diaphragm is removed.

Blender render of the OTOM CFD demo: Supersonic Wedge, Mach 2 — **Supersonic Wedge, Mach 2**Mach 2 flow meets a wedge: an oblique shock starts at the tip; expansion fans at the shoulders.

Blender render of the OTOM CFD demo: Bow Shock on a Cylinder, Mach 2 — **Bow Shock on a Cylinder, Mach 2**A blunt body in Mach 2 flow: a curved bow shock stands off in front of it, with the highest pressure (red) just ahead of the body.

Blender render of the OTOM CFD demo: Car Side View, Compressible Solver — **Car Side View, Compressible Solver**The car-photo scene run with the compressible Euler solver at Mach 0.27.

2D Rotating Machinery

Blender render of the OTOM CFD demo: Oil Gear Pump — **Oil Gear Pump**Two meshing gears carry oil round the housing from the inlet to the outlet.

Blender render of the OTOM CFD demo: Gear Pump in a Real Housing — **Gear Pump in a Real Housing**A two-gear pump drawn inside a photo of a real housing: the photo outline is the solid casing.

Blender render of the OTOM CFD demo: Three-Gear Train — **Three-Gear Train**Three meshing gears of different sizes; pressure builds where the teeth close and drops where they open.

3D Aerodynamics

Blender render of the OTOM CFD demo: Sphere Drag at Re 100 — **Sphere Drag at Re 100**A sphere in a 3D wind tunnel with a steady ring vortex in its wake (the wake is steady below Re ≈ 210).

Blender render of the OTOM CFD demo: Car Body in a Wind Tunnel (25° Rear Slant) — **Car Body in a Wind Tunnel (25° Rear Slant)**A simplified car body with a 25° slanted rear window — the standard reference shape of automotive aerodynamics — imported as a mesh.

Blender render of the OTOM CFD demo: 3D Wing — **3D Wing**A finite wing in a 3D wind tunnel at high resolution (256³).

Blender render of the OTOM CFD demo: Swept Wing, Lambda-2 Vortices — **Swept Wing, Lambda-2 Vortices**A tapered wing swept back 45° at 8° incidence.

Blender render of the OTOM CFD demo: Propeller — **Propeller**A spinning propeller in an axial flow; its blade-tip vortices wrap into a helix downstream.

Blender render of the OTOM CFD demo: Propeller Start-up, Slow Motion — **Propeller Start-up, Slow Motion**The start-up of the propeller flow, slowed down so each step can be followed.

Blender render of the OTOM CFD demo: Quadcopter Downwash — **Quadcopter Downwash**An imported quadcopter with four actuator-disk rotors (cyan arrows mark the rotors).

3D Vortex Visualisation

Blender render of the OTOM CFD demo: Colliding Jets, Q-Criterion — **Colliding Jets, Q-Criterion**Two opposed jets meet in a closed box and break up into turbulent eddies.

3D Heat & Ventilation

Blender render of the OTOM CFD demo: Hot Plume in a Room — **Hot Plume in a Room**A heated block on the floor sends a warm plume to the ceiling while slow ventilation crosses the room.

Blender render of the OTOM CFD demo: Data Centre Hot Aisle — **Data Centre Hot Aisle**Four server racks either side of a hot aisle; their heat is a heat source in the aisle and a ceiling fan extracts it.

3D Process Equipment

Blender render of the OTOM CFD demo: Stirred Tank Reactor — **Stirred Tank Reactor**A sealed vessel with a shaft and two spinning impellers; the liquid is set swirling.

Blender render of the OTOM CFD demo: Stirred Tank with Gas Sparger (new) — **Stirred Tank with Gas Sparger (new)**Gas bubbles released at a ring sparger under the lower impeller rise, are swirled by the impellers and burst at the liquid surface.

Demo gallery slides

The same 28 scenes as a slide deck, with what each one shows, the physics and solver settings, and which results are validated against references. Download the slides (PDF).

AFP thermal-camera analytics

From the IR camera module of the OTOM AFP simulation software: real recordings from different AFP thermal cameras, read in the browser. The nip line is tracked frame by frame, the picture is sharpened by AI without changing any reading, and tape, roller and substrate are found automatically. Click a picture for the full-size image.