A channel is a fluid property, for example velocity. The fluid's velocity channels is available as a series of vertex maps and can be used to visualize differences in the property's values. This way it is possible to achieve realistic shading effects. Please go to → "Mesh Rendering" to learn how to use channels with materials and shaders.
Speed
Speed is the combination of the individual "Velocity X | Y | Z" values.
Velocity X | Y | Z
Instead of the combined speed value it is also possible to visualize the individual XYZ components.
Scale
Every channel has a "Scale" parameter for controlling the vertex map's strength. This is useful to enhance differences in the channels and to create more contrast.