I understand that this problem occurs because the “flow” object moves very fast (in 60 frames 72 meters) and a little sideways. But how to fix it? I have tried all possible settings (sampling substeps at maximum, resolution divisions I changed from 50 to 500, tried to change timesteps), but nothing helped.
By the way, I do not need to use this simulation of smoke, so if there are suggestions how to make a beautiful and realistic trace of the missile, with pleasure I will listen. Or if you know exactly how to solve this problem, then please advise values for settings to get a beautiful trace.
The render shows the trace from the first missile and if you look closely, it also shows gaps, but not as obvious as the second.
You could go around the lack of substeps by making the entire animation 2x slower and then rendering 1/2 images using the “frame step” feature.
An other solution would be not to use a smoke simulation and instead use a particle system. In fact, if the trails have to be very long, particles might be better suited, as they are not limited by the size of a domain and are faster to bake.
Finally, it could also be done without any simulation, using a mesh object that gets converted to volume.
