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How to plot smooth vortex?

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Old   June 19, 2013, 22:08
Default How to plot smooth vortex?
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I am using Q-criterion. I first calculate the second invariant of velocity, and then normalize it with the maximal value in the flow field. The vortices are visualized by plotting iso-surface about 0.001. However, I find the vortex surface is very tough and there are a lot of small fragments in the flow field. I cannot get vortices as smooth as the attached literature. I am wondering the reason. Is it because my plotting method incorrect? Or is the resolution of my simulation too low?
Thank you in advance.
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