What is exactly meaning of divergence free in solver?
I realized that it does not make advecting data not to be stucked in an area.
But how does it works?

How does pressure field generated and get working with gas project non-divergent node?

divergence free means the fluid is totally incompressible and the total volume stays the same over the time, otherwise, it will shrink or expand.

fkkcloud
What is exactly meaning of divergence free in solver?
I realized that it does not make advecting data not to be stucked in an area.
But how does it works?

How does pressure field generated and get working with gas project non-divergent node?

This tutorial here will answer “all your questions”:

http://www.sidefx.com/index.php?option=com_content&task=view&id=2200&Itemid=132 [sidefx.com]

Cheers