Color remains one of the best means of conveying information about related scalar quantities over a volume rendered flow. In the image on the top, color varies from red to yellow with increasing temperature, highlighting the effects of friction across the boundary layers in this flow. In the image on the bottom, saturation increases with increasing streamwise vorticity across the same set of streamlines, subtly emphasizing the areas of greatest turbulence.

In this image, color is used as an additional variable to represent the magnitude of the vorticity across the flow volume.  This particular visualization conveys the pressure waves that are being propagated down the axis of the flow.

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