rotating fluids log @slipring-blog - Tumblr Blog

footage synced in time+space this video samples every 2 rotations, or in this special case, every 361 frames the camera is in ~exactly the same position the tank's rotation allows one camera to effectively capture a set of timelapse views of the experiment from a ring of angles this is one such view, aligned for most convenient cross-reference there are 360 other 'channels', at a 2 degree resolution that allow the ~30 minute experiment to be condensed into 1-2 minute synopses from key views

CLICK PHOTOS for captioned slideshow.

fluid bending interface - front end interface & dye-curtain driver functions

[ 2-view, 2-point, 2-color dye-release into Eddy set-up ] [ inertial frame camera images spatialized into relative view angle in rotational frame ]

// ... turntable spinning counter-clockwise is considered 'still' through a co-rotating frame of reference. a fixed view in the inertial frame beyond the table will appear to be revolving in the clockwise direction.

#co-rotating frame #2 droplets #38° spaced views

[ green tracer release + 10 revolutions ] [ co-rotating, lean-over view ] [ 8 keyframe interpolation ]

#first minute #plume generator 2

[ green tracer release + 10 revolutions ] [ co-rotating, eye-level view ] [ interpolated over 8 keyframe roughs ]

// gen02 dye curtains parametrized by: + overhead x,y curves + sideview upper,lower bounds + variable tilt to sheet along its length + variable width / waver to sheet along its length

// at time of export, zoetrope view was functional for animation build-mode only. // in testing, over&outlying image data references will update along w/ animation run-time.

#plume generator 2 #zoetrope

[ 4 rotations ] [ virtual co-rotating view : close-up w/o gloss]

#.75x speed #translucent #plume gen 1

[ 8 rotations ] [ virtual co-rotating view : near-iso]

// ... interpolation strength > 1 creates animated dwelling on keyframes

#1.5x speed #plume generator 1 #glossy

[ drifting still / interpolation test ] // gen01 dye curtains parametrized by: + overhead x,y curves + sideview upper,lower bounds

#plume generator 1 #4 variables

[ General Circulation : Mid-latitude Eddies ] [ Vertical structure of 2-drop Eddies run ]

{ this video supports 3d cross-view. see here for tips.)

// ... created with source video from 1 camera; the rotation of the system enables a simple time delay to produce "free" 3d glimpses. clues to structure can be found by looking at the areas the dye seems to rest, lean, or revolve upon.

// ... this animation uses a smooth flow-forward across fluid revolutions. the wealth of trajectories in this space permits free exploration in time & angle of observation, guided by features of interest.

// ... in this instance, a positive framedrift (CCW swivel) is added to make a slower rotating view within the co-rotating frame, giving a sense of the larger system spin.

#3d!

[ rotating system: liquid water annulus w/ icy center ] [ rotation rate: 10 rpm ] [ reference frame: co-rotating ] [ tracers ] . 1 drops green dye @ colder inner can . 1.1 drops red dye @ warmer outer periphery

// ... most action is invisible for the first 1.5 minutes!

[ Multiview, multipoint, 2-color dye-release into Eddies ] [ Three video streams synced to common inertial frame ]

#inertial frame #multipoint droplets #full framerate

[ rotating system: liquid water annulus, w/ icy center ] [ rotation rate: 10 rpm ] [ reference frame: co-rotating ] [ tracers ] . 3 drops green dye @ colder inner can . 5 drops red dye @ warmer outer periphery

// ... most action is invisible for the first 3 minutes! // ... SKIP to 8m30s to make the climatology connection

[ rotating system: earth ] [ variable field: potential temperature ] [ pressure level: 850 millibar ]

{general circulation experiment - high rotation rate) {models extratropical zone - eddy regime) [ 6s loop = 10 rpm ]

// click-through for better view

General Circulation / rotation rate ↺ flows { tropical latitudes | extratropical lats } { low rotation rate | high rotation rate } { 1 rpm | 10rpm } { Hadley cell | Eddying cells }

{general circulation experiment - low rotation rate) {models tropical zone - hadley regime) [ 60s loop = 1 rpm ]

// click-through for better view

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