Select the Phoenix Simulator. Disable the Gravity since a nebula supposedly forms in outer space. Change the Conservation Method to Buffered, with a Quality of 40. Set the Steps Per Frame to 2. The Buffered method has the weakest conservation strength and shortest range, but produces nice details. For in-depth information, check the Conservation documentation.
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As we simulated without the Temperature channel, in this special case, there is no difference in the simulation results with or without gravity.