lloydwood Posted September 4, 2015 Share Posted September 4, 2015 Hello, I'm sure this is something simple but I could do with a pointer. I'm getting these streak artifacts in my pyro sim (I've looked at the other topics on here and not found quite the same issue I'm having). I'm not sure what's causing them. I have noise on my emitter, a bit of disturbance and a bit of turbulence (I'm not using any other shaping fields other than dissipation). I guess any one of these could cause this odd pattern but I'm not sure which. It's a fairly low-res sim in this example but at a higher res, it's the same with smaller streaks. Any pointers would be great. Quote Link to comment Share on other sites More sharing options...
jkunz07 Posted September 4, 2015 Share Posted September 4, 2015 That comes from disturbance being set to high and/or too large of a scale. Quote Link to comment Share on other sites More sharing options...
lloydwood Posted September 5, 2015 Author Share Posted September 5, 2015 Excellent. Thanks John. I'll play around with the disturbance values. Quote Link to comment Share on other sites More sharing options...
Whatsinaname Posted February 13, 2016 Share Posted February 13, 2016 Strange. I am getting these artifacts, too. But without using any disturbance (just density, vel and temperature with a tad of dissipation). It also feel like these areas are not behaving correctly, as the smoke just stays there while the rest of that smoke is getting pushed upwards by density. It was great to know what exactly is causing these streaks, not only that it happens when there is too much dissipation (which I already knew), but what is happening under the hood that is leading to those artifacts. Any ideas? Quote Link to comment Share on other sites More sharing options...
loopyllama Posted February 14, 2016 Share Posted February 14, 2016 I could only guess without a hip file (hint hint). density gets pushed around by velocity. velocity gets pushed around by itself and outside forces. a counter pressure is solved for to make the system divergence free. -it could be velocities that you are not intending (some fan force, really small scale on curl noise velocities in the source, scale too high in some velocity altering field like turbulence) -it could be the system being pushed too hard and the solve isn't accurate enough, see timescale, substeps, cfl condition Quote Link to comment Share on other sites More sharing options...
huge Posted July 1, 2016 Share Posted July 1, 2016 Pyro_Solver/advanced/advection-tab/advection and vel advection/ blend>0 to avoid those artifacts... Quote Link to comment Share on other sites More sharing options...
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