Color contours indicate the velocity component in the streamwise direction. Velocity vectors in the normal plane are also shown. As in the previous image, purple and blue indicate high velocity while red and yellow indicate low velocity. In this case the higer speed fluid is jet fluid causing a great change in the development of the flow. Secondary velocity vectors correcpond very well with the scalar field.
Velocity field give a clear indication of the future transport of the scalar.
Large vortical structures correspond with well mixed portion of the mixing images.