Fluid Visualization in Nature
On the rare occasions that CFD-ers unhitch from their Matrix and venture outdoors, it is only to see that nature is copying the visualization techniques we take for granted in Computational Fluid Dynamics (CFD).
Though in CFD we tend to concentrate on streamlines (the instantaneous path tangential to the velocity field), nature prefers streaklines. Streaklines provide a richer insight into the time history of an injected tracer. Tracers can take many forms, e.g., pollen and silt.
Nature provides an excellent example of an iso-surface visualization when a plume of saturated steam is ejected from a chimney. The surface of the plume marks the outer boundary of the saturated steam that has condensed after coming into contact with the cold air surrounding it.
Surface contours are analogous to volume iso-surfaces. A good example is oil floating on flowing water, which produces surface colored contours. The oil layer becomes thinner in the presence of faster moving flow regions and this varies the polarizing effect of light reflected off the oily surface, leading to a spectrum of colors.
Visualizing vectors in CFD as arrows or lines is a common practice, and no less so in nature too. Nature can produce velocity-aligned vectors as streaks on a car hood. All you need is to drive through a rain storm on a hot day which coincides with tree pollen season, then wait for the rain to stop and the pollen streaks to dry.
Recent blog posts
- Never Settle For Facets
- When Good CFD Goes Bad
- How Aerodynamics Dominates The Tour de France
- Wacky CFD
- Go Full Circle With CFD
- CFD Expertise Is Your Modern Day Pick and Shovel
- CFD Benefits From 3D Printing
- Cutting Planes Reveal Yet More Hidden CFD Secrets
- Clipping Planes Reveal Even More Hidden CFD Secrets
- Symmetry Reveals More Hidden CFD Secrets