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Smokesolver algorithm

Hi guys! 

I have custom velocity field and i'm copying it using sourcevolume, then applying on it gasturbulence and sending to the smokeslover. As i understand how smokesolver works, velocity self advection block will have no effect, cause after it im copying my prepared velocity field, so i decided to disconnect it (vel selfadvection block).  All of a sudden i saw the difference between this two simulations. I figured out, that selfadvection block somehow affects gasturbulense microsolver. So the question is - how is it possible if all data, including selfadvection is rewrited with my custom vel field before it comes to the gasturbulence? 

Screenshots - advection on, advection off


Edited by Now

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Ok, i understood the reason - gastrublence uses density field as well, and it's advecting before 4-th input. And i was rewriting veloctiy at 5-th

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