Stop-action: https://www.sciencealert.com/watch-vortex-smoke-ring-collision Even finer detail: https://gfm.aps.org/meetings/dfd-2018/5b9ad86eb8ac3105e5ac8e1e Next situation: Unfortunately, there is not yet a video which shows what needs to be shown. What needs to be shown is the result of the collision of 6 smoke rings on 3 axi, each at right angles to the other two axi. The first instant of collision would look similar to the six faces of a cube with rounded corners. In other words, there would be no "membrane" as shown in frame "b" of the second video, that is: the "stop-action" video. Instead, the collision would begin at the outer circumference of each vortex and work its way to their centers. In other words, the last instant of the collision would be the contact of all six centers at the same point. At least, that's what I suspect; but it needs to be tested in order to be sure. There are at least two ways to test. One way to test would be to build a tank which produced 6 colored smoke rings which all collided in the same volume at the same time. Up-down axis, left-right axis, back-front axis. The other way to test would be to use software. That is, programs such as Houdini, Real Flow, BiFrost, and Psunami. So maybe your company would be willing to make this simulation video to show what your software can do?
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