How to make this circle shape SMOKE with a hole?

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I was trying to do it but i cannot make a hole for the smoke. Here is my blend file so please take it and if you can improve so there is a hole than i would be grateful

http://www.pasteall.org/blend/41315

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i was also trying to make collision but i failed as well with that

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Ok. I was playing a bit more with that now and found that setting resolution divisions up to 200 makes that hole for the smoke. But still whould like to here your advices guys

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Create circle
edit mode -> select all -> extrude -> escape -> s 0.8
object mode -> quick smoke
smoke settings
up the resolution to 64
high resolution to 2