many thanks for the link & info
from the diags there it appears i had assumed the complete opposite direction of flow for the toroidal vortex...(& we all know what ass.u.me does)
image credits to Mr Roger Marmion
so i was thinking that the flame at center of can to keep at most distance from can lining, airflow of flame would create too strong a force for the toroidal vortex to flow in opposite direction. Just as the high & low pressure systems will rotate in opposite directions allowing more fluid motion, my assumption that if strongest flow of (flame) air being pushed through the turbine that (logically) the inner part of torodial vortex would spin with the flame not against it as indicated at (b), very intriguing that it goes against the flow of the flame.
either way a pain to animate.
many thanks to those who posted,
send me a PM if you'd like a peek at what I've done so far
cheers