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This is a narrow question, so your narrow answer is appreciated. At this point I do not want to include a picture.

A fluid simulation was working well enough in timespan A.

In timespan B an obstacle was placed and fluid behaved as expected for many frames. Obstacle and Fluid interacted. Then one of the following events occurred

  • Subtle movements of fluid obstacles. Including obstacles coming nearer to each other or farther from each other. More inportant.

  • Cyclical fast and abrupt movement of the obstacle. Less important.

These event seemed to coincide with the disappearance of say 99% of fluid. So any comments may need to categorize moving obstacles or stationary obstacles. These scenario descriptions are guesses. I am seeking confirmation.

I saw no large amount of fluid on the domain walls. Then the water inflow seemed to stop as well.

I have witnessed similar behaviour before with Blender Fluid Simulation

Have others witnessed this behaviour? It would be my preference to hear from people with similar experiences.

A related question could be ... Are there certain classes of fluid simulation in Blender that are known to fail or be beyond the scope of Blender FS?

I sometimes use obstacles to hydro form the fluid. Thus it is not my goal to [push into] water, according to a comment below, yet I may be doing so. I am waiting for a comment clarification.

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    $\begingroup$ I've had problems where an obstacle pushes into a fluid - it's as if any fluid that ends up within the obstacle is simply 'lost' to the simulation. Can you share a Blend file that shows the problem? $\endgroup$ – Rich Sedman Apr 5 at 22:40
  • $\begingroup$ Please clarify [pushes into] 🔃 $\endgroup$ – atomicbezierslinger Apr 6 at 20:56
  • $\begingroup$ I’ve had issues wherever an obstacle moves towards a fluid while in contact with that fluid - including where the fluid is contained within the obstacle. It’s as if the fluid can react to a stationary surface but if that surface moves to overlap the fluid the fluid is effectively destroyed. $\endgroup$ – Rich Sedman Apr 6 at 22:03
  • $\begingroup$ I think this question blender.stackexchange.com/q/116872/29586 might be related - where the fluid disappears when the container moves - I believe it's as the fluid (slightly) overlaps with the container as the container moves towards the fluid that causes the issue. $\endgroup$ – Rich Sedman Apr 7 at 5:57
  • $\begingroup$ The question above may be related IMHOIIHO in that Blender Fluid Simulation has undesirable behaviour. Though I have not tried to accomplish what he attempted. $\endgroup$ – atomicbezierslinger Apr 7 at 17:19

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