Notes on INS (20): Fluid dynamics in pictures

Fig1. Components of stress: a) normal (pressure), b) shear

(Source: gamasutra / Michael J. Gourlay)

Fig. 2: Advective acceleration: Velocity at each point remains constant, but a tracer following the field causes the tracer to accelerate

(Source: gamasutra / Michael J. Gourlay)

Fig. 3. Vortices and their flows: (a) a line vortex (purple dashed line) and the circular flow around it (black solid line), and (b) a ring vortex and the “jet” flow through it

(Source: gamasutra / Michael J. Gourlay)

Fig 4. Time derivative of vorticity

(Source: gamasutra / Michael J. Gourlay)

Fig 5. Vortex stretching: (a) A vortex tube with a bulge with velocity flowing outward from the bulge causes the bulge to shrink. (b) After the bulge squirted away, the tube shrank: The amount of mass rotating there decreased, so to conserve angular momentum, vorticity increased. In other words, the tube rotates faster where it initially rotated more slowly.

(Source: gamasutra / Michael J. Gourlay)

Fig 6. Hurricane vortex (Source: NASA, 1996)

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