Hi Paul~
Thanks so much for getting back to me!
Unfortunately, no go with these adjustments. I do see striations in the sim. One thing I didn’t mention is that slightly above each emitter object (no particles) I have a larger disk set as a collider object so the smoke does not rise above the bottom of each engine. When I turn off those collider objects, the smoke seems to not have this flicker (though it just might be “masked” by the increased spread of smoke at the emitter).
I can send the C4D file if you are interested.
Thanks!
s