why is my smoke blocky? Hi all, i am basically creating a tunnel of smoke in blender 2.77, cycles.

i have a flat ring mesh with a vortex underneath, and i have also added a cylinder on the outside (collision object) with a cone on the inside (also collision object) so that i can see thru this tunnel. i run the simulation, bake it and when i render it you can see this odd pattern in the smoke, both inside and outside, probably because the collision object causes something in the simulation. i have tried increasing resolution in the smoke, both in the base resolution and "show high resolution" panels, currently 128 divisions, and have gone up to 5 divisions in high res panel. I have also increased heterogeneous volume sampling step size which does help but i lose a lot of detail. currently step size is 0.6.
this "pattern" is quite persistent thru the animation and looks pretty awful.

anyone had this before?
ok, applying the scale to my emitter object seems to have done the trick, thanks heaps!