Operating system: Windows 10
Graphics card: Nvidia GeForce GTX 650 Ti
Processor: Intel® Core™ i7-3770
Broken: 2.82, master. (this is a general problem with Mantaflow; previous versions of Blender with Mantaflow implementation also possess this problem)
Worked: (previous gas simulation framework)
Short description of error
The effects of external forces on smoke (vorticity, force-fields, etc.) seem to increase in strength over time, despite not being animated. I am not sure if this is intended behavior; however, it certainly hinders the use of Mantaflow and I believe it should be minimized.
Demo with vorticity. (I am using a very medium strength for vorticity. This problem becomes much more dramatic, when using greater values, such as 1.0)
Demo with a "Force" force-field.
Exact steps for others to reproduce the error
- Add a mesh.
- Press F3, type in and select "Quick Smoke"
- In domain settings, set vorticity to a medium value (ie: 0.3; 0.5; etc.)
- Bake the simulation.
Here are two .blend files, one with just the vorticity changes and one with a force field: